HomeMy WebLinkAboutInformation Only 072324AGENDA
INFORMATION UPDATE
July 23, 2024
5:00 PM,
I.Information Update
I.A Ongoing Wildfire Preparedness Efforts
I.B West Mountain Regional Housing Coalition Follow Up Memo
I.C Follow-Up Memo for Marolt Open Space - Proposed Bike Skills Trail Site Visit
Wildfire_Informational_Memo_23072024.docx
Follow-Up WMRHC.docx
Follow-Up_Memo_062424.docx
210728 Marolt Mgmt Plan Document opt.pdf
CWS Marolt Skills Trails Tech Memo (21MAR2024).pdf
Aspen_CO_BikeSkillsTrails_DDProposal_4-9-24.pdf
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INFORMATIONAL ONLY MEMORANDUM
TO: Mayor and City Council
FROM: Shelly Braudis, Natural Resource Manager
Bill Linn, Assistant Police Chief
THROUGH:Diane Foster, Assistant City Manager
MEMO DATE:July 15, 2024
MEETING DATE:July 23, 2024
RE:Ongoing Wildfire Preparedness Efforts
PURPOSE:
The memorandum aims to update City Council on the combined efforts of city
departments to address wildfire preparedness in the Aspen community. This is a follow-
up from an earlier informational memorandum provided to City Council on February 27,
2024.
SUMMARY:
The City’s role in wildland fire preparedness can be broken down to the following
general themes. Land use and related code, such as electrical code, tree code, and
building code. Infrastructure such as a resilient water supply, and planning safe
evacuation routes. And collaboration and support with partners such as Aspen Fire
Protection District, Roaring Fork Wildland Collaborative, and other partner agencies.
Parks and Open Space:
Parks and Open Space staff have been working on several fronts to address wildfire
risks in the Aspen area. The content of this memo will not go into detail on wildfire
related tree removal code changes, which are presented in Ordinance 11 slated for first
reading at the July 23, 2024 Council meeting. In conjunction with that code, an IGA
focused on establishing framework for the City and AFPD to work collaboratively on
providing home assessments and recommendations for reducing wildfire risk on
property will be presented to Council on August 13, 2024.
Since the last memo, the Parks & Open Space department has filled the Natural
Resource Manager position with the hiring of Shelly Braudis. This additional position will
bolster the department’s capacity to continue to support wildfire preparedness
opportunities and initiatives in the Aspen area, and to coordinate fuel reduction projects
on parks and open space parcels, as well as actively participating in Wildfire
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Collaborative Meetings and developing public outreach initiatives to better inform
residents of the methods and benefits of wildfire resiliency on their properties.
The department also spearheaded an Intergovernmental Agreement (IGA) for funding of
wildfire detection camera’s and all parties to that IGA committed to funding cameras
across the upper Roaring Fork Valley, including the City’s contribution of $32,000 for
2024.
The Parks and Open Space department continues to partner with other agencies on the
management of adjacent forests, and further information may be found in the
Informational Memo provided to Council on May 28, 2024.
Aspen.gov Webpage Development:
City staff recognized the need to provide information on wildfire prevention to the
community through compiling various resources into one place. In collaboration with
Community Development, Parks, Utilities and Communication departments, a new
webpage (A link to Wildfire Resources on Aspen.gov) now hosts information for
residents on ways to remove and reduce fuel around homes and structures; harden
their home and building materials, maintain vegetation, and provides links to the Aspen
Fire Protection District’s page on Home Assessments and other building code
requirements for ignition resistant construction.
Wildfire Collaborative:
The Roaring Fork Wildfire Collaborative has been meeting monthly for the last several
years. To date, staff from the Parks and Open Space and Utilities departments have
represented Aspen’s interests in collaborative meetings. The collaborative has
consolidated recent past projects into a comprehensive, valley-wide map of wildfire
mitigation efforts. This process will segue into discussions regarding future areas for
wildfire mitigation strategies, and other project prioritization discussions across the
collaborative region.
Also of note is that the collaborative has focused a working group on ensuring that
underrepresented residents and communities are engaged in the collaborative work,
and a sub-committee has been created centered on Environmental Justice, Equity, and
Inclusion.
Public Safety:
The Police Department, Special Events and Communications Department are working
collaboratively with the Aspen Fire Department and the Pitkin County emergency
manager to educate the public about emergency evacuation routes, areas of refuge and
sheltering in place in case of wildland fire or other large-scale emergency. Staff are
participating in monthly public sessions hosted by Aspen Fire, in which evacuation
routes and designated areas of refuge are explained. Evacuation routes and staging
areas are dynamic, and APD and other stakeholders have developed communication
plans that may be used during an evacuation event, as each event can pose distinct
risks and challenges making some routes or staging areas unsafe.
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Together, these teams are harnessing technology to enhance evacuation planning and
increase the effectiveness of current evacuation plans. The technology includes an
artificial intelligence model that uses existing traffic patterns to predict the effectiveness
of evacuations. Also, a regional effort has brought a new evacuation mapping software
which will allow more granular evacuation planning, neighborhood by neighborhood.
NEXT STEPS:
Financial impacts are minimal for continued support of the public facing website and
participation in the Collaborative. Funding the Natural Resource Manager was included
in the 2024 budget. The City contributes $32,000 annually to the wildfire detection
camera program. Staff are evaluating increasing funding available in 2025 for wildfire
mitigation projects and programs, and may present these proposals to Council during
the 2025 budget presentations.
CITY MANAGER NOTES:
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FOLLOW-UP MEMORANDUM
CITY COUNCIL WORK SESSION
WORK SESSION MEETING DATE:July 8, 2024
FOLLOW-UP MEMO DATE:August 13, 2024
AGENDA TOPIC:West Mountain Regional Housing Coalition
(WMRHC)
PRESENTED BY:Jenn Ooton, Senior Project Manager and
WMRHC
COUNCIL MEMBERS PRESENT:Mayor Torre, Councilors Doyle, Hauenstein,
Rose
Absent: Councilor Guth
______________________________________________________________________
WORK SESSION DISCUSSION SUMMARY:
The West Mountain Regional Housing Coalition nonprofit presented a request for
$450,000 to help stand up a pilot program to convert free market housing into deed
restricted housing in the Roaring Fork Valley.
The presentation included information about the nonprofit, information about the
housing situation within the region, and programmatic details for the deed restriction
purchase program. Through the program, the WMRHC would buy a deed restriction by
offering up to 30 percent of the purchase price, allowing a homebuyer in the local
workforce to pay 70 percent of the home price. The home would then be priced capped
at an annual appreciation of 3 percent annually, with the appreciation starting at the cost
of the home paid by the homeowner (70 percent). Qualified buyers must work full-time
for a local employer or retire after 10 years of local work and may not own any other
residential property. The maximum price of a free market home eligible for the program
is scaled based on the price of homes in different parts of the region, with a maximum
price of $1.5 million up valley of and including Basalt.
Topic: Contribution to Good Deeds Program
Some Councilors had additional questions regarding the program, similar programs in
the region, and the availability of homes for sale within Pitkin County and Aspen that are
listed under the maximum sales price. Council discussed the request for $450,000 for
the nonprofit’s “Good Deeds” program, without consensus on the contribution amount.
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NEXT STEPS:
A resolution in support of the contribution will be brought forward to Council at an
upcoming meeting with the number for the contribution left blank, which will allow Council
to discuss the amount further.
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FOLLOW-UP MEMORANDUM
CITY COUNCIL WORK SESSION
WORK SESSION MEETING DATE:June 17, 2024
FOLLOW-UP MEMO DATE:June 24, 2024
AGENDA TOPIC:Marolt Skills Trails
PRESENTED BY:Brian Long, Matt Kuhn
COUNCIL MEMBERS PRESENT:Torre, Ward Hauenstein, John Doyle, Sam
Rose, Bill Guth
OPEN SPACE BOARD MEMBERS Dan Perl, Adam McCurdy, Julie Hardman,
PRESENT: Anne Mullins, Ted Mahon, Howie Mallory
______________________________________________________________________
WORK SESSION DISCUSSION SUMMARY:
Council met with the Open Space and Trails Board on-site at the Marolt and Thomas
Open Space parcels. The discussion that followed focused on land management and
recreation concerns and the suitability of the site for a proposed area of bike skill trails.
A tour of the site included stops at the top of the project area, along Marolt Place below
the project area, and in the nearby meadow where other existing uses are concentrated.
1.Site Suitability:
Council and Board discussed wildlife and traffic concerns on-site in the proposed
project area. Council members had questions on Open Space definitions and
layout of proposed trails. Although questions regarding the overall impacts remain,
a majority of Open Space Board members expressed general support for the site.
2.Design Considerations:
Both Council and Board members expressed a desire for the design of the Skill
Trails to work within the landscape and to respect existing vegetation. Staff and
RFMBA have kept that a guiding principle in the design process to date.
3.Potential User Conflict:
Council and Board considered potential project conflict with existing uses of dog
walking and paraglider landing. These uses were acknowledged and their
longstanding presence in the vicinity recognized. It was noted that no use conflicts
are expected in the proposed project area. Staff pointed out the separation and
screening that exist between existing and proposed uses.
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REQUESTED DOCUMENTS:
Council and Open Space Board members requested some additional information and
documents. The following are included as attachments to this memo:
-Marolt Open Space Management Plan
-Marolt/Thomas Skill Trails Public Engagement Results
-Colorado Wildlife Services Skill Trails Tech Memo
-Progressive Trail Design Proposal
NEXT STEPS:
1.The Open Space Board will consider a formal recommendation to Council
at their next meeting on July 18, 2024.
2.If the Open Space Board recommends approval, staff will include the Skill
Trails in the 2025 Capital Project budget. Council may review and provide direction
at that time.
3.As the capital project is executed, a contract for construction would be
before Council for consent and comment.
CITY MANAGER NOTES:
______________________________________________________________________
______________________________________________________________________
__________________________________________________________
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MAROLT OPEN SPACE
Management Plan
July 2021
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Marolt Open Space Management Plan
TABLE OF CONTENTS
1. INTRODUCTION 1
1.01 Foreword 1
1.02 History 4
1.03 Process and Public Involvement 19
1.04 Management Plan Goals 20
2. EXISTING CONDITIONS 21
2.01 Planning Area 21
2.02 Natural Resources 22
2.03 Visual Resources 27
2.04 Historical Resources 28
2.05 Existing Plans and Policies 31
2.06 Current Uses 36
2.07 Adjacent Land Uses 38
2.08 Access, Trails, and Parking 39
2.09 Recreation 42
2.10 Water Rights and Infrastructure 42
2.11 Signage 44
3. PUBLIC AND STAKEHOLDER COMMENTS 47
3.01 Public Comments 47
3.02 Aspen Snowmass Nordic Council 50
3.03 Aspen Historical Society 50
3.04 Aspen Community Garden 50
3.05 Marolt Ranch Employee Housing 51
3.06 Commercial Operators 51
3.07 Other Stakeholders 51
4. OPPORTUNITIES AND PLANNING ISSUES 53
4.01 Overview 53
4.02 Land Use Restrictions 53
4.03 Maintenance 53
4.04 Natural Resources 54
4.05 Historical Resources 54
4.65 Recreation and Trails 54
4.07 Interpretation/Education 55
4.08 Agriculture 56
4.09 Aspen Community Garden 56
4.10 Special Events 56
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5. MANAGEMENT ACTIONS 57
5.01 Overview 57
5.02 Maintenance 58
5.03 Natural Resources 60
5.04 Historical Resources 62
5.05 Recreation and Trails 64
5.06 Interpretation/Education Actions 66
5.07 Agriculture 68
5.08 Aspen Community Garden 68
5.09 Special Events 70
APPENDICES
A Planning Area Map
B Vegetation & Wildlife Baseline Report
C Archaeological Master Plan for Development of the Holden Lixiviation Works
D Historic Preservation Plan, Holden Lixiviation Works
E National Register of Historic Places Inventory – Nomination Form
F Wood Assessment of the Derrick and Stamp Mill, Holden Mill
G Architectural Drawings for the Historic Derrick, Holden Lixiviation Works
H Water Infrastructure Map
I PUD and Subdivision Agreement
J Plat
K Public and Stakeholder Comments
L Existing Recreational Access Maps
M Management Actions Maps
N Original PD Document
O Plats
BIBLIOGRAPHY
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MAROLT OPEN SPACE MANAGEMENT PLAN | 1
1. INTRODUCTION
1.01 FOREWORD
The Marolt Open Space is a significant property within the City of Aspen’s portfolio of open
space lands. Its prominence at the entrance to Aspen and its role in the community’s silver
mining and ranching heritage confer unique importance on this 74.5-acre parcel. Purchased
with incredible foresight several decades ago, the Marolt Open Space has become a beloved
landscape in the heart of the greater Aspen community where eyes may rest on
undeveloped green expanses, people enjoy recreational activities and outstanding scenic
views, local mining and ranching history is preserved and celebrated, recreationalists and
commuters use trails connecting community amenities, and wildlife move among adjacent
natural areas.
Today, this property hosts a mining & ranching museum, community garden, wildlife
habitat, buffer zones between developed and natural areas, Nordic ski trails, a paraglider
landing zone, and bike paths that are vital community connectors. The Marolt Open Space
provides visual and physical representation of community values as stated by Tom Baker
(Assistant Planning Director/Director of Long-Range Planning, Aspen/Pitkin County Planning
Office, 1984 to 1990) in his August 1987 memorandum to City Council:
“…perhaps most important was this parcel’s ability to serve as a key piece of
open space at the City’s west entrance; a parcel free of development making a
statement about Aspen’s image to all who travel through it.”
Baker’s memorandum echoes ideas expressed in an implementation action pertaining to
the Marolt/Thomas Open Space in the Aspen Area Community Plan in 1985:
The parcel could convey an important image to all those entering the community due to
its location at the entrance to town and directly across Highway 82 from the golf course.
Marolt Thomas should be developed as a passive open space parcel divided into serval
large open space areas... The Marolt-Thomas parcel will serve as part of a larger open
space corridor; and function as one of the foci of the trail system…
Bordered by Castle Creek Road, Moore Open Space, the Roundabout, Highway 82, Power
Plant Road, and Castle Creek, the Marolt Open Space consists of open grassy meadows,
stands of aspen, cottonwood, and spruce trees, mountain shrublands, willow and
cottonwood riparian ecosystems, and fragments of sagebrush ecosystem as well as ponds,
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wetlands, irrigation ditches, and a reach of Castle Creek. Much of the property is flat, glacial
terrace land with steep slopes along the gorge of Castle Creek. Elevations range from 7,860
to 8,000 feet above sea level. While much of the property is covered by non-native
vegetation and areas that receive heavy human use, this landscape is a valuable buffer zone
between ecologically important habitat areas within and surrounding the property. Wildlife
use the Marolt Open Space for fawning, nesting, migratory stopovers, seasonal movements,
resting cover, and foraging.
While relatively undeveloped and open, the landscape of the Marolt Open Space and its
general surroundings have been used, heavily at times, by people across history. The
Northern Utes and their ancestors were present seasonally in the upper Roaring Fork Valley
for about eight hundred years. Exploration and mapping expeditions to western Colorado
and the gradual removal of native Northern Utes was followed by the first permanent
encampment at the future City of Aspen in 1879, starting the silver mining era. Ranching
activities began in earnest in 1884 as a second basis of the local economy. In 1888, the
Midland Railroad’s tracks crossed what would become the Marolt Open Space, and in 1891
the massive Holden Lixiviation Works was built on the west bank of Castle Creek. The mill
was the only lixiviation works in the state and the largest in the nation until the Silver Panic
of 1893 brought about its untimely closure after only 14 months of operation. Later, the
surrounding land and eventually the disused lixiviation site would become ranch and farm
facilities producing hay, potatoes, livestock, and other products into the early 1980s.
In the early 1980’s the City of Aspen acquired parcels of land, creating the Marolt Open
Space with the intent of making it a passive park that would serve as a hub for the local trail
system. The Thomas parcel was acquired in 1982 and the Marolt parcel was acquired in
1983. Both parcels together are referred to in this document as “The Marolt Open Space.”
Of the property’s 74.5 acres, 39.2 acres are zoned for conservation and 35.2 acres are zoned
R15 PUD SPA. Fifty-seven and one-half acres were purchased with open space funds, 6.76
acres were purchased with transportation funds, and 10.1 acres were donated to the City.
The Marolt Open Space is a favorite social and recreational site enjoyed by paragliders,
cross-country skiers, dog walkers, cyclists, and runners. Children bike to and from school on
the paved and single-track trails. Other commuters and recreationalists cross the property
on its trail network that connects the downtown core and surrounding residential areas
with neighborhoods and community amenities to the north and west, including the
hospital, public school campus, Aspen Valley Ski and Snowboard Club, Aspen Recreation
Center, Castle and Maroon Valleys, Aspen Highlands and Buttermilk Ski Areas, the Moore
Open Space, Aspen Golf Course, residential neighborhoods, and other parts of the greater
Aspen area. It is also the site of the Holden Marolt Mining and Ranching Museum and
Aspen Community Garden. The City of Aspen Parks Department also utilizes a site on the
property for maintenance operations activities. The Bergman Trail winds through a portion
of the historic lixiviation site where a derrick replica and series of interpretive signs invite
visitors to imagine the industrial activities that took place here during the mining era. The
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Marolt Open Space is a keystone property in the City of Aspen’s open space portfolio,
providing a vibrant landscape at the heart of the community.
The ongoing goals of this management plan are to protect, restore, and preserve the
qualities of the Marolt Open Space in the spirit of the acquisition of the property, and in
reflection of the values and needs of the natural and human communities that depend upon
this space. This management plan document will be reviewed and updated every ten years.
1 Landscape view of Holden Lixiviation site and future Marolt Open Space, 1934. Courtesy Aspen Historical Society
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2 The Colorado Midland Railroad trestle and Holden Lixiviation Works, circa 1895. Courtesy Aspen Historical Society
1.02 HISTORY
The history of the landscape of the Marolt Open Space is characterized by its importance in
past and present human cultures, due in part to its topography and location within the
community and Roaring Fork Valley. As a prominent site in two major historical industries,
mining and agriculture, and as a keystone site for contemporary recreation, transportation,
and greenspace themes, the Marolt Open Space has been and continues to be a very
important landscape for the community of Aspen.
THE UTES
Prior to the arrival of prospectors in the late 1800s and for the preceding 800+ years, the
Roaring Fork Valley was the summer seasonal home of the Northern Utes and their
ancestors. These indigenous peoples hunted and gathered in the area’s rich high country,
procuring elk, deer, and other game animals for meat and hides, as well as the abundant
berries and other foods and resources. The Northern Utes wintered in lower elevation
landscapes to the north and west.
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MAROLT OPEN SPACE MANAGEMENT PLAN | 5
3 History timeline for the Marolt Open Space and its local surrounding region
Colorado became a state in 1876, the year of the Meeker Massacre in which Northern Ute
Indians revolted against government attempts to convert their nomadic lifestyle to an
agrarian one. The U. S. Government gradually removed the Northern Utes from their
ancestral lands, including the Roaring Fork Valley, relocating them on reservations in Utah.
THE SILVER MINING ERA AND THE HOLDEN LIXIVIATION WORKS
Ferdinand Hayden’s 1873-1874 U. S. Geological Survey expedition passed through Colorado
where the party mapped the mountainous landscape and noted mineral deposits and other
resources of potential economic importance. Mining took hold in Denver making its way
along the Front Range and into the mountains of Colorado where coal deposits lay and
where valuable minerals such as silver and gold were contained in the rock formations of
Colorado’s Mineral Belt.
Prior to the 1881 removal of the Northern Utes, the first permanent mining encampments
were established in 1879 near Ute Springs, the future site of the City of Aspen. As Aspen
gained worldwide renown as producer of one-sixth of the nation’s silver output and one-
sixteenth of global silver production, it attracted investors and industry leaders with an eye
for innovation and potential profits. Edward R. Holden was well-known in the mining
industry by the time he set his sights on business opportunities in Aspen. He was a
metallurgist by training with experience in assaying, sampling, smelting, milling, and the
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business of mining, and was respected by his peers. Holden gained expertise with the
technical, financial, and administrative aspects of the mining industry as a speculator and
promoter, and in 1889 he began in-depth research toward building a lixiviation works in
Aspen to process the area’s low-grade ore. Currently, Aspen was the state’s largest silver
producing district with a population of 12,000, making it Colorado’s third largest city after
Denver and Leadville. Holden was also a principal owner of the Justice Mines in Tourtelotte
Park.
4 Sanborn Map of The Holden Smelting & Milling Co., 1904. Courtesy Aspen Historical Society
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MAROLT OPEN SPACE MANAGEMENT PLAN | 7
In December 1891, the Colorado Midland Railroad
deeded a 20-acre parcel on the west bank of
Castle Creek, part of the Stitzer Ranch, to the
Holden Smelting and Milling Company. This
property would become known as the Holden
Tract. The massive plant of the Holden
Lixiviation Works was built in 1890-1891 and
processed 72-125 tons of low-grade ore per day
for the next fourteen months. It was one of the
most advanced ore-processing facilities of its time;
the only lixiviation facility in the state and the
largest in the nation. Using the patented Russell
process, silver ores were roasted with salt and
dissolved with sodium hyposulfite, and silver was
then separated with the addition of an alkaline
sulfide.
The physical plant consisted of a 27,200 square-foot, five-story mill building equipped with
four 30-foot tall drying furnaces, a 40-stamp mill for crushing ore, many large processing
tanks, and two tall, brick smokestacks. Other facilities included a sampling house, ore bed
buildings, a refinery, coal bins, two power houses, penstock piping, ditches, a salt
5 The Holden Lixiviation Works, circa 1900. Courtesy
Aspen Historical Society
6 The Holden Lixiviation Works, circa 1900-1910. Courtesy Aspen Historical Society
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warehouse, an assay office, and two railroad spurs. Mechanical and electrical power were
generated by a hydro-power system using water diverted from Castle Creek via a wooden
flume. The flume water flowed into a steel penstock pipe running downslope to deliver
tremendous water pressure to two powerhouses on the bank of Castle Creek where a
three-foot Pelton wheel generated electricity for the mill’s lighting and an eight-foot Pelton
wheel generated mechanical power to run its machinery. Power was transmitted to the mill
through cables and wires supported by a derrick.
When the Sherman Silver Act was repealed in 1893, the silver market collapsed overnight,
and Holden’s fortune slipped away. After a series of lawsuits and foreclosure, the sheriff
took possession of the Holden Lixiviation Works on August 29, 1893. So close to achieving a
steady profit, the works sat idle until a group of creditors operated the mill in an attempt to
retrieve their losses. These creditors formed the Aspen Union Smelting Company in 1895
and received the deed to the Holden Tract that year to operate as a sampling business.
Portions of the building were later leased and remodeled by various other companies for
milling and concentrating purposes, all of which eventually ran into economic difficulties.
7 Aspen's baseball field in 1895, located on the present-day Aspen Golf Course with the smokestack of the Holden
Lixiviation Works in the background on land that would become the Marolt Open Space. Courtesy Aspen Historical
Society, Cooper Family Collection
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MAROLT OPEN SPACE MANAGEMENT PLAN | 9
For the next 31 years, the Holden Tract changed hands among several owners. During that
time the buildings deteriorated, and locals scavenged them for salvage lumber and
hardware. Rancher Fred Cullett’s family lived in the Assay Office during that time, and
portions of the tract may have been rented to other ranchers. In May 1932, owner W. C.
Tagert released the title to Frank Rudolph, Jr. and Stephen Marolt for one dollar. They
combined it with their purchase of the Midland Ranch to form the Marolt Ranch, bringing
the property into a new era.
THE RANCHING ERA
Mining in the late 1800s involved many work animals including horses, mules, and jacks.
These work animals pulled ore cars, carried ore over the mountains for processing
elsewhere, and provided transportation by pulling wagons and buggies and by carrying
riders. The few ranches in the Roaring Fork Valley could not meet the demand for hay and
bedding for these animals. Meanwhile, miners lived on a meager diet of bread, salted pork,
and canned goods. Supplemental food and hay were hauled over from Leadville at
astronomical prices. With the final removal of the Northern Ute Indians in 1881, the area’s
agricultural industry took hold and settlers claimed land throughout the valley to begin
cultivating food and hay for the booming town of Aspen.
Popular views at the time spurred
white settlers to make the valley’s
bottomland productive; its clay loam
soils were rich, although the growing
season was only 76 days and average
annual precipitation was just 19.5
inches. Local newspapers encouraged
agricultural settlement and
development on the basis of excellent
soils and climate, easy irrigation, and
a guaranteed market for farming and
ranching products. According to an
Aspen Times article on January 1,
1884, “Ranching is a valuable auxiliary
to mining, and is sure to become a
great factor in Pitkin County success.”
Alfalfa hay forage became such a valuable and prolific crop that the Rocky Mountain Sun
wrote in 1886, “Surely there are mines on top of the ground as well as beneath the
surface.” In addition to hay, other local crops included oats, wheat, peas, parsnips,
potatoes, turnips, rutabagas, cabbage, cauliflower, asparagus, rhubarb, grapes, currants,
strawberries, tree fruits, and other cold weather crops. Farms and ranches produced dairy
products, honey, eggs, beef, pork, chicken, lamb, and stock animals.
8 Cutting hay on the Marolt Ranch in 1945. Courtesy of Aspen Historical Society
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As mining faded in the early 1900s, ranching and farming became the basis of the local
economy. Seeds, tools and supplies were either ordered or purchased locally at dealers
such as Cowenhoven & Co. Slowly, large implements arrived in the Roaring Fork Valley
where farmers shared threshers, binders, mowing machines and other large, expensive
equipment. Produce was delivered to sale in Aspen via wagons and sleighs. Irrigation was
the lifeblood of local agricultural operations, and land values rose dramatically as water was
claimed and ditches were built. Colorado’s water law developed out of prior appropriation
doctrine and as demand on water increased, water districts were formed to control and
manage this important resource. Stockmen and farmers formed organizations, and grazing
on public land brought about controls and conflicts as public land became degraded.
THE MAROLT RANCH
Much of the land
comprising the
Marolt Ranch was
owned by
speculators until
1927. This land was
first owned as four
separate properties
that were acquired
from the U. S.
government by four
individuals in the
early 1880s. By 1886,
Jerome B. Wheeler
had purchased the
four properties which
later became known
as the Stitzer Ranch,
then the Midland
Ranch, and later the Marolt Ranch. In 1886, James J. Hagerman, a trustee of the Colorado
Midland Railroad, purchased the property, and in 1888 he transferred ownership to another
trustee, Henry C. Lowe. After some failed initial arrangements, 20 acres known as the
Stitzer Ranch were deeded to the Holden Smelting and Milling Company in December 1891.
This parcel then became known as the Holden Tract where the Holden Works was
constructed in 1890-1891.
For many years, the surrounding property, known as the Midland Ranch, was leased to local
ranchers including T. O. Clark, Billy Tagert, and Lou Teuscher. When the Colorado Midland
Railroad ran into financial problems in the late 1910s, Albert E. Carlton, new owner of the
railroad, purchased the property in 1917. Ownership bounced back to the railroad and then
9 A man and two children with cattle on the Marolt Ranch, circa 1900, with the Holden
Lixiviation Works in the background. Courtesy Aspen Historical Society
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MAROLT OPEN SPACE MANAGEMENT PLAN | 11
again to Carlton by 1923, meanwhile the land was farmed by local lessees. In March 1927,
Carlton sold the Midland Ranch to Frank Rudolph, Jr., William Marolt, and Stephen Marolt.
The Marolt brothers were sons of Austrian-Hungarian immigrants, Frank and Frances
Marolt, who had twelve children. They owned a saloon in Aspen and later owned a ranch
on what is now the Meadowood Subdivision. William sold out to his brothers in 1929, and
the three remaining brothers purchased the 20-acre Holden Tract in May 1932 for one
dollar.
At that time, there were five buildings still standing on the Holden Tract: the office/assay
building, the sampling works, the salt warehouse, and two other small buildings. The main
mill building had deteriorated over the years and locals had scavenged useable lumber and
hardware, leaving the site in ruins. The three Marolt brothers continued to ranch the land,
and when Rudolph died in 1936, his heirs transferred deed of his share to Stephen and
Frank Jr. On June 7, 1940, Stephen and Frank divided the property: Stephen owned the
western part (present site of Aspen Golf Course) and Frank owned the eastern part
(including the Holden Tract). Two weeks later, Frank died, leaving his wife, Elsie Helen
Marolt, as his sole heir.
10 A tilled field on the Marolt Ranch with one of the smokestacks of the lixiviation works still standing in the
background, circa 1945. Courtesy Aspen Historical Society
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In September 1940, Elsie Marolt sold her ranch property to another Marolt brother, Mike.
At this time, Ted ranched the land that belonged to his parents, while Steve and Mike
ranched their respective western and eastern properties. The three brothers were close
and saw each other nearly every day. At one point, the U. S. Army considered Mike’s ranch
as a potential site for Camp Hale, and he was relieved when a location near Red Cliff Valley
was selected instead.
Mike’s wife, Opal was born in Aspen in 1914. They had four children: Keith, Judy, Peggy,
and Vicki. Mike and Opal’s house, the former office/assay building, became the social
center point of the extended family, where they hosted picnics and family gatherings.
Beef cattle, some of which were registered Herefords, were the main focus of the ranch
business, along with a few milk cows. The cattle were grazed on National Forest in summer
and fed in pasture during winter. The Marolts and several other local ranchers drove their
cattle up Maroon Creek and moved them several times a season on horseback. Mike’s
cattle brand was X111, which can be seen on the granary doors along with Steve’s U1
brand. Opal separated milk from the dairy cows to make butter and cream. Dairy products
were used mainly by the household and any extra cream was shipped by train to creameries
in Glenwood Springs or New Castle. Mike also raised pigs and Opal raised chickens for meat
and eggs.
The Marolt family cultivated alfalfa, timothy,
and brome grass for hay, harvesting two
cuttings each summer. Hay was stacked
through the early 1950s and was later baled.
Hay crops were rotated with potatoes, barley,
and oats. Grain was used as cattle feed and
hog mash made with molasses and skim milk.
Opal cooked for the crew of neighboring
farmers when the threshing machine came to
process grain for the ranch each year.
Burbank potatoes were grown and stored in a
potato cellar (a historic structure standing
among overgrown vegetation on the Marolt
Open Space is thought to be this potato cellar.
Opal raised onions, lettuce, carrots, beets,
string beans, corn, spinach, cauliflower, and
cabbage in her garden, as well as flowers
which she entered in the annual flower show
held at the Armory.
The ranch’s water supply came from two
ditches, one which ran along the base of the
11 Mike Marolt circa 1935. Courtesy of Aspen
Historical Society.
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hill below Castle Creek and another which ran through the farm compound (today this is the
golf course ditch). Horse-drawn equipment was used through the 1940s, after which
tractors were used.
Over the years ranching activities changed and buildings were altered accordingly, often
with wood re-used from the property as well as from the old Castle Creek bridge and from
Camp Hale. The house had been remodeled and still contained the mill’s safe. The
sampling building became the granary, serving as grain storage, a workshop, and a hen
house. Mike added partitions to the interior, creating grain bins for oats, barley, and wheat.
A threshing machine outside delivered grain via an auger through windows and doors.
Grain was ground with a hammer mill on the west porch, originally the loading platform for
the Colorado Midland Railroad’s sidetrack. In the shop, Mike had a work bench and forge
where he did blacksmithing and woodworking. To make the work of re-roofing easier, Mike
removed the original cupola which had probably covered an ore elevator during the Holden
Works’ operating years. Mike and Keith built a lean-to on the south end of the granary for
machinery and animals.
The Marolt family used the old salt warehouse for various purposes, referring to it at
different times as the barn, horse barn, and milking shed. Because the site of this 80-foot-
long building was shaded by Shadow Mountain and received too little sun in winter, the
east part of the building was removed and used to build a new barn and corral in a sunnier
location to the north of the granary. A concrete floor and hay loft were added as uses
changed from shelter for riding horses to milking, and later to storing tack.
The Marolt children raised animals as part of the 4-H program and held their own pretend
rodeos. Cherie Gerbaz Oates, a childhood friend of the Marolt children, remembers that
some of the best times at the ranch were spent lying on a bridge across Castle Creek
watching leaves floating downstream. The children played in the granary and cousin Bill
Marolt Jr. made a ski lift inside using an old rope from the music tent. Although he broke
his arm in a fall and had to miss the upcoming football season, he went on to become a
well-known ski racer. Following Mike’s death in 1967, Opal rented the granary to Don
Westerlind who built a second floor inside to facilitate storage.
Two other small buildings that likely originated as part of the Holden Works were located in
the vicinity of the Marolt family house. One was used for machinery and equipment
storage and the other, located on the ditch bank, served as a saddle shed where tack was
stored.
Although the mill building was in ruins when the Marolts acquired the ranch, the
smokestacks were still standing. The taller smokestack, which was 165 feet in height, was
an Aspen landmark for more than 60 years. It had provided draft for the Holden Lixiviation
Works’ Stedefeldt furnace and later served as a meat locker for the Marolt family, where
Mike hung butchered beef and smoked sausages. Bill Tagert dynamited the smaller
smokestack in the early 1940s in an attempt to dismantle and sell the bricks, but the blast
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destroyed them. About a decade later, Jake Lewis attempted to dismantle the larger
smokestack. He used a pile of sawdust onto which he safely dropped the bricks one at a
time as he worked his way downward from the top. Keith Marolt finished the disassembly
in the mid-1950s, selling the bricks to help pay for school. These bricks are incorporated
into several local buildings that still stand today.
The red cattle barn north of the granary housed weaned calves and milk cows. Cattle were
dehorned and branded in this barn. After Mike’s death, Opal rented the barn to furniture-
builder Terry Morse. The barn burned sometime in 1968-1970. There were also several hay
sheds on the ranch that no longer exist today.
In the late 1950s, the Marolt family began tapering off ranching activities and sold parcels of
their land as they coped with reduced U. S. Forest Service grazing permits, their children’s
college expenses, and Mike’s declining health. As one of the land sales, a northern parcel
was purchased by Leonard Thomas in 1957. Mike passed away in 1967 and Opal lived on
the ranch until 1986.
OPEN SPACE HISTORY
In the early 1980s, the City of Aspen acquired parcels that would become the Marolt open
space. Leonard Thomas sold his parcel of the Marolt Ranch to the City of Aspen for the
purpose of open space in 1982. Shortly thereafter in 1983, the Marolt Family donated 10.1
acres and the City of Aspen purchased 25.5 acres for additional open space for $2.1 million.
The intent was to create a passive park that would serve as a hub for the local trail system.
Of the property’s 74.5 acres, 39.2 acres are zoned for conservation and 35.2 acres are zoned
R15 PUD SPA. Fifty-seven and one-half acres were purchased with open space funds, 6.76
acres were purchased with transportation funds, and 10.1 acres were donated.
Activities that precede the establishment of the Marolt and Thomas open space parcels and
still continue today include the use of the south meadow as a hanglider landing area since
the 1970s (now used primarily by paragliders) and gardening in the Aspen Community
Garden which was established in 1978. Larry Dunn along with Ed Compton and others built
the garden on a portion of the Thomas property to the north of the former Colorado
Midland Railroad trackway. The garden has been expanded several times, most recently in
2015, and now has 57 large plots and 26 small plots. The Marolt Trail was paved sometime
between 1968 and 1974 prior to the land becoming open space.
Nordic ski trails were first established and groomed on the Marolt open space as part of the
Aspen Snowmass Nordic Trail System in 1984. In 1985 the Music Associates of Aspen used
the barn and sheds for rehearsal and set-building space.
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12 A paraglider approaches the landing area on the Marolt Open Space. Volunteer Ed Compton in the Aspen Community
Garden in 1978, courtesy Aspen Historical Society.
In 1989, Aspen Historical Society (AHS) signed a 75-year lease on the Barn/Salt Shed site for
the Holden Mining and Ranching Museum. The museum explores and celebrates the
industrial silver mining and agricultural history of the Aspen area. The site was recognized
as a historic district and listed on the National Register of Historic Places in 1990. It is also
listed on the State Register of Historic Places. Please see Section 2.05 Existing Plans and
Policies and Appendix E for more information on these listings. Additional historical
buildings were relocated in 2018 to the site leased by AHS.
13 The Holden Marolt Mining and Ranching Museum operated by the Aspen Historical Society, left; and a historic building
moved to the AHS leased site in 2018, right.
In 1990, voters approved a $6 million bond for the City of Aspen to construct the Marolt
Ranch Employee Housing Project on Lot 1 of the Marolt Ranch Subdivision. Lot 1 was defined
in the 1981 Subdivision Plat at 4.325 acres and was not designated as Open Space. This lot
exists today within the greater Marolt Open Space area and is subsequently labeled Lot 3 in the
second amendment subdivision plat.
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Today, the Marolt Ranch houses students from the Aspen Music Festival and School in
summer and Aspen Skiing Company employees in winter. This property is zoned (PUB)
Public and while the housing itself is not within the Marolt Open Space, its associated
parking lot is partially located within the Marolt Open Space.
In 1992 the Parks Department initiated a project to survey and interpret the historical
foundations, artifacts, and landscape features of the lixiviation site, focusing on the
foundations of the main mill building and other features in the immediate area of the east-
facing slope above Castle Creek. The resulting Archaeological Master Plan was produced by
Alpine Archaeological Consultants; see Appendix C . In 2004 Tatanka Historical Associates
was contracted to inventory historic resources, produce a report of the site, and develop a
series of interpretive signs that would tell the story of the Holden Lixiviation Works and its
ruins; see Historic Preservation Plan, Appendix D. Parks then cleared overgrown vegetation
and designed and constructed the Bergman Trail, a soft-surface loop trail descending an old
road cut to the bottomland along Castle Creek below the mill’s stair-stepped sandstone and
timber foundations and passing by the powerhouse foundations, remains of the original
derrick, a replica of the derrick, and other artifacts. A sandstone overlook was constructed
on the edge of the terrace above the mill’s ruins. Interpretive signs were installed at the
overlook and at points along the Bergman Trail. In 2005 a Wood Assessment of the Derrick
and Stamp Mill was conducted by Anthony & Associates in order to document the condition
of historic wood features; see Appendix F.
14 The Bergman Trail features a series of trailside panels that explain the Holden Lixiviation Works and its historic
remains.
An historically accurate reconstruction of the derrick was installed in 2016 in order to bring
this unique structure to life and provide a sense of overall scale to the former mill site.
Local architect Graeme Means and Ray Ingram of Renaissance Works collaborated to
recreate the original structure, replicating the original architectural design, wood species,
local sourcing and milling of timbers, and use of traditional hand tools. The replica was
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MAROLT OPEN SPACE MANAGEMENT PLAN | 17
raised and installed on the original footprint using a gin pole system. See Appendix G for
architectural drawings.
15 Ray Ingram and crew raised the derrick replica in June 2016.
THE ENTRANCE TO ASPEN
The Marolt Open Space includes parts of the gorge of Castle Creek along its eastern
boundary, with the majority of the property lying on the flat terrace to the west, part of
extensive flat glacial terraces that make up the valley floor in this part of the Roaring Fork
Valley. In 1891 when the original Castle Creek Bridge was built across the gorge to provide
an at-grade route into town from the west, the Holden Lixiviation Works was in the way of a
straight alignment with Aspen’s Main Street. The bridge was built a short distance to the
north in order to bypass the mill, creating the ‘S-curves’ that exist today. The entrance to
Aspen with its S-curves has been a source of contention and debate ever since that time.
16 This historic illustrated map, "Bird's Eye View of Aspen, Pitkin County, Colo. 1893," shows the locations of Main Street,
Castle Creek Bridge, and the Holden Lixiviation Works during the period when the entrance to town was established.
Courtesy of Aspen Historical Society
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Highway 82 became a state highway in 1911 and it was paved in sections between 1937 and
1939. The original Castle Creek Bridge was replaced in 1961. As part of a major project
completed in 2018, the bridge deck was redesigned to improve the bike/ped lane.
Over the last 40 years, issues related to the entrance to Aspen have been on local ballots 26
times. Relevant ballot outcomes are as follows. In 1975 City of Aspen citizens voted to
secure federal funding for a partnership with Pitkin County to build a light rail system. The
second vote in 1982 asked voters if council should be authorized to convey a right of way
across the Thomas property for two or four lanes of traffic to 7th and Main, this did not pass.
Aspen voters decided against a straight shot concept in 1986 and approved a train terminal
in 1986. In February 1990 voters chose a 4-lane highway alignment as a straight shot to 7th
Street and Main over the same expansion along the existing alignment. In 1994, Pitkin
County voters decided against converting open space land to build the highway. The
question of support for a valley-wide rail system between Glenwood Springs and Aspen
failed on City and County ballots in 1998. In 1999 the City of Aspen asked for a $20 million
bond to construct the light rail system, and this also failed. Another 1999 ballot outcome
directed City Council to work with other valley governments to develop a transit plan
comparing bus-only with bus-to-rail concepts for a bonding vote by November 2000. Also,
in 1999, voters supported a valley-wide transit system with park-n-rides and no increase of
in-town parking. In 2000 Pitkin County voters passed a $10.2 million bond to realign
Highway 82 to 7th and Main Streets with bridges and a tunnel. In 2001, City of Aspen voters
chose not to convert open space land for a 2-lane highway with exclusive bus lanes until rail
funding could be approved. In 2002, both the City and County asked voters whether they
supported S-curves or a modified direct route, and the S-curves won.
Additionally, in 1999 a lawsuit opposing the realignment went to the Federal Court of
Appeals. The Federal Highway Administration ruled that the Entrance to Aspen Final
Environmental Impact Statement of 1997 must be re-evaluated before moving forward with
any realignment alternative. The re-evaluation was completed in 2006, but without a local
voters’ approval for funding, the federal court
cannot proceed with the appeal case. In 2016,
Aspen City Council, Pitkin Board of County
Commissioners, and Snowmass Village Town
Council voted in support of spending almost
$500,000 to study costs of building light rail across
the Marolt Open Space compared to building
dedicated bus lanes across the property.
A pond and wetland area were created in 1999 on
the south portion of the Marolt Open Space as part
of the mitigation for wetlands impacted by
construction work on Highway 82.
17 Pond and wetland built on the Marolt Open Space
as mitigation for Highway 82 construction in 1999
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1.03 PROCESS AND PUBLIC INVOLVEMENT
Public comments, existing conditions, input from staff and the City of Aspen Open Space
and Trails Board, and stakeholders’ comments have been incorporated in the development
of this Draft Management Plan. Appendix K contains public and stakeholder comments
received to date. Two public open house events were held in June 2019: at the Red Brick
Center and on site. The City of Aspen’s website hosted a webpage to provide a public
portal to the Marolt Open Space Management Plan effort, a venue to a calendar, and a
survey designed to gather additional public comments. The first public comment period
closed on July 12, 2019. Following a review of the Draft Management Plan by the City of
Aspen Open Space and Trails Board, a second online public comment period will be held
from February 15th to March 15th. Staff will then review all comments received, revise the
Draft Management Plan, and present a Final Management Plan to the Board for adoption.
19 Public Open House event at Red Brick Center, June 25, 2019
18 Timeline of the public process for development of the Marolt Management Plan
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1.04 MANAGEMENT PLAN GOALS
This management plan will guide decision-making for the Marolt Open Space into the
future. Goals of this plan include:
• managing for land stewardship and ecological integrity
• preserving view planes and open space
• managing for preservation and enhancement of wildlife habitat
• preservation and interpretation of the historical mining and ranching resources
• balanced and integrated approaches to public access, recreational uses, and trail
management
• supporting the community garden
• providing a framework for handling commercial and special events requests
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2. EXISTING CONDITIONS
2.01 PLANNING AREA
The planning area, referred to in this management plan document as the Marolt
Open Space, consists of the Marolt and the Thomas Open Space parcels located at
the entrance to the City of Aspen. The Thomas parcel, acquired in 1982, is 39.2
acres and the Marolt parcel, acquired in 1983, is 35.6 acres.
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2.02 NATURAL RESOURCES
Surveys were conducted and a report was prepared during summer 2019 by Colorado
Wildlife Science, LLC and Peak Ecological Services, LLC in order to document existing
conditions for natural resources on the property, including soils and geology, vegetation,
and wildlife. Recommendations for management approaches with regard to natural
resources were also provided. The following subsections summarize the results of these
surveys. Please see Appendix B for the Vegetation and Wildlife Report, 2019 Growing
Season, Marolt-Thomas Open Space.
SOILS AND GEOLOGY
The well-drained, rocky, moderately permeable soils across the property are generally deep,
ranging from 40-60 inches to bedrock. Formed in glacial deposits, the soils occur on gently
sloping alluvial fans and terraces. Textures range from clay loam to sand, and the dark
surface layer contains a high degree of organic matter. Five soil units are represented on
the property: Urraca and moist-Mergel complexes occur over the grass meadow areas and
an additional small area at the southeast corner of the property. The hydric soils of
Fluvaquents occur along Castle Creek. Torriothents-Camorthids-Rock outcrop complex
occurs on the steep slopes of the gorge of Castle Creek. Yejack-Callings complex occurs at
the southwest corner of the property along a small ridge. The soils along Castle Creek are
derived in alluvium of sand, silt, and gravel.
The geology of the Marolt Open Space consists of glaciofluvial deposits of poorly sorted
outwash gravels, and the western edge consists of poorly sorted moraine deposits ranging
from silt to boulders. Alluvium of sand, silt, and gravel occur along Castle Creek.
VEGETATION
The vegetation cover within the Marolt Open Space comprises a variety of plant
communities representing native and non-native plants in various stages of recovery from
past industrial mining and agricultural activities, and reflective of current recreational and
maintenance activities. The first large-scale change to vegetation here occurred when the
Holden Lixiviation Mill was constructed on 22 acres in 1891-1892. Historical photos from
that time reveal that most riparian vegetation along Castle Creek was removed for mill
operations. When activities shifted from mining to ranching in the early 1900s, the riparian
corridor was left to continue recovering from past mining disturbances, and the terrace land
was actively farmed and ranched. During the past several decades as a City of Aspen Open
Space property, vegetation has further recovered, while invasive weeds have become
established in certain areas.
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Vegetation cover was evaluated by Peak Ecological Services in June and July 2019,
identifying ten plant alliances and twelve plant associations, in total comprising 133 vascular
plant species, 30% of which are non-native. No rare or sensitive species were documented
on the property; however, it should be noted that dense undergrowth makes surveying
areas of the riparian corridor extremely difficult. Colorado Natural Heritage Program
(CNHP) mapped the area along Castle Creek as part of the Maroon Creek – Castle Creek
Potential Conservation Area due to the presence of natural riparian plant communities.
Thirteen species of noxious weeds were documented during field work in 2019. These
weeds are being controlled by City of Aspen Parks Department and none were noted to be
problematic at the time.
Figure 20 Plant communities: cottonwood-red-osier dogwood, Castle Creek riparian, smooth brome hay meadow
Forests and woodlands cover 16.2 acres of the property. The highest quality vegetation
community, Narrowleaf Cottonwood – Red-Osier Dogwood Riparian Woodland, occurs
along Castle Creek. This is a vegetation association that is ranked as State “Vulnerable” by
CNHP. This forest has a closed to open canopy and supports a diversity of native plants
including alder, bush honeysuckle, mountain lover, starry false Solomon’s seal, roundleaf
wintergreen, scouring rush, bog orchid, and field horsetail. Other forests occur along the
property’s irrigation ditches and ponds where stands of narrowleaf cottonwood are
established with an understory of non-native grasses and wet shrubland communities of
mixed willow and river birch. In addition, a small stand of aspen adjacent to the Aspen
Community Garden and adjoining stand of cottonwood share a similar understory
dominated by non-native pasture grasses. Amid these cottonwoods is a small stand of blue
spruce.
Tall mixed mountain shrubland communities on the property are primarily Gambel Oak –
Serviceberry Shrublands, which are ranked as State Imperiled by CNHP. A well-represented
stand of this shrubland type exists in the southwest corner of the property across from
Aspen Valley Hospital, where tall Gambel oak shrubs on this ridge intermix with mountain
big sagebrush, snowberry, and sticky rabbitbrush. Here, the understory is composed of
non-native grasses such as Kentucky bluegrass and smooth brome and native plants such as
Nelson’s needlegrass, elk sedge, aspen fleabane, sulphur-flower buckwheat, and silvery
lupine. Noxious weeds present include plumeless thistle and houndstongue. This Gambel
Oak – Serviceberry Shrubland also occurs on the slopes above Castle Creek, in several areas
north of the Holden Marolt Mining and Ranching Museum, along portions of the former
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Colorado Midland Railroad bed, and along the edges of the Aspen Community Garden
where it is interspersed with Mountain Snowberry Shrubland. A Gambel Oak – Shrubland
south of the museum has an understory of primarily snowberry.
Other shrublands on the property are classified as sagebrush, snowberry, and rabbitbrush
associations. Two sagebrush communities documented include a Mountain Big Sagebrush
Ruderal Shrub Grassland in the northeast corner and a Basin Big Sagebrush Ruderal
Shrubland adjacent to the north pond. The term ruderal refers to a vegetation community
growing where human disturbance has significantly interrupted native vegetation cover.
Both of these sagebrush communities contain non-native grasses such as smooth brome,
quackgrass, and crested wheatgrass, and have either lost their native grass and forb
understory plants or simply represent shrubs that have colonized historically farmed or
grazed pastureland. Occasional native plants in these areas include narrowleaf Indian
paintbrush, comandra, silvery lupine, and Rocky Mountain penstemon.
Two types of wet shrublands occur along irrigation ditches and ponds: River Birch Wet
Shrubland is found at the Marolt Wetland mitigation site where this community also
contains bog birch, redosier dogwood, sandbar willow, and narrowleaf cottonwood.
Herbaceous plants here include hardstem bulrush, wolly sedge, tufted hairgrass, and wild
iris. Tall Willow Wet Shrubland has developed around the pond in the northwest corner of
the property where whiplash willow, sandbar willow, hawthorn, and Drummond’s willow
dominate. Reed canarygrass, an invasive wetland grass, is also found around this pond.
Non-native Grassland or former hay meadow/pasture occurs on the terrace land above
Castle Creek covering about one-third of the property and bisected by numerous, presently
inactive irrigation ditches. These grasslands are dominated by smooth brome, an
aggressive, non-native species which outcompetes and suppresses native plants, resulting in
low species diversity and low ecological value. Where they occur, native plants in this area
include western wheatgrass, Rocky Mountain penstemon, hairy golden aster, flax, arrowleaf
balsamroot, and hairy golden aster. A few escaped, ornamental, red poppies have
naturalized in an area northeast of the Aspen Community Garden. While low in ecological
value, these grassland areas offer aesthetic and historical value. Native serviceberry,
sagebrush and rabbitbrush shrubs are beginning to colonize portions of the grasslands.
21 Native vegetation: sagebrush, arrowleaf balsamroot, narrowleaf cottonwood
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Pollinator habitat is found among the mixed mountain and sagebrush shrublands where an
array of native flowers provides important habitat for native bees, butterflies, moths, flies,
bats, beetles, and other organisms. This habitat is critical to ecosystem health as pollinators
help plants reproduce and produce enough seeds for dispersal and propagation, and to
maintain genetic diversity. Pollinator populations have suffered declines in recent decades
due to many factors including loss, degradation and fragmentation of habitat, pesticides,
and other impacts. Managing for pollinators is an important component of land
management.
Small disturbed areas occur throughout the property, some of which are currently used for
construction or storage of slash and soil. A steep slope area adjacent to the Holden Marolt
Mining and Ranching Museum is dominated by weedy species and could be considered for a
future native plant restoration project.
Noxious weeds documented on the property include Canada thistle, field bindweed, oxeye
daisy, dalmation toadflax, common tansy, lesser burdock, plumeless thistle, houndstongue,
redstem stork’s bill, scentless chamomile, mullein, cheatgrass, and bulbous bluegrass.
WILDLIFE
Although the Marolt Open Space is a relatively small property, it provides habitat that is
valuable to wildlife, notably songbirds, small mammals, meso-carnivores (animals whose
diet consists of meat and other foods such as fungi, fruits, etc.), mule deer, and Rocky
Mountain elk. Because of the high level of human activity and extensive areas of non-native
vegetation with low structural complexity (mainly the large grass/hay meadows), wildlife
species richness and abundance is relatively low and comprised mainly of species that are
tolerant of human activity. The highest quality habitat is found in the riparian corridor
along Castle Creek.
The interspersed patches of the property’s various habitat types support both resident and
seasonal wildlife, including a variety of songbird species, and mule deer and elk during
transitional seasonal movements. Mule deer with fawns have been documented on the
property.
22 Mule deer fawn and garter snake photographed on site June 2019, photos by Jonathan Lowsky
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Colorado Wildlife Science (CWS) studied wildlife on the Marolt Open Space in June and July
2019 by conducting pedestrian surveys along two parallel transects. Direct observations of
wildlife as well as wildlife sign (beds, nests, fur, feathers, burrows, dens, pellets, scat, prey
remains, food caches, markings on the ground or on tree bark, and sounds) were recorded.
Nocturnal bird surveys were also conducted.
One hundred twenty-seven individual birds were detected, representing 24 species. Most
of these are species known to be tolerant of human activity and known to use a wide
variety of habitats. Examples include American robins, black-billed magpies, and black-
capped chickadees. A few bird species that are more sensitive and have narrower habitat
requirements were also detected. Birds of conservation concern that are known or have
the potential to occur on the property include bald eagle, northern pygmy owl, band-tailed
pigeon, Lewis’s woodpecker, and Virginia’s warbler.
23 Great horned owl, yellow-rumped warbler, green-tailed towhee, mountain bluebird
Seven to nine mammal species comprising 55 individual detections were documented,
including elk, golden-mantled ground squirrel, least chipmunk, mule deer, northern pocket
gopher, red squirrel, and voles (voles were noted by sign only which could indicate any or all
of three possible species). Mule deer use the Marolt Open Space during the non-winter
months, as evidenced by a doe and a days-old fawn that were observed by CWS during their
June survey. Elk use the property during transitional periods between summer and winter.
Additional mammal species known or with the potential to occur on the property include
coyote, red fox, nine species of bat, bobcat, mountain lion, bushy-tailed woodrat, common
muskrat, deer mouse, North American porcupine, western jumping mouse, yellow-bellied
marmot, mountain cottontail, three species of shrew, northern pocket gopher, American
black bear, and raccoon.
24 Red fox, long-tailed weasel, least chipmunk
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Although no specific herpetofauna surveys have been conducted on the property, one
reptile, a western terrestrial garter snake was observed. Appropriate habitat exists for
boreal chorus frogs and tiger salamanders, but their presence has not been confirmed.
No federal- or state-listed endangered or threatened species are known or suspected to
occur on the property and no critical habitat for such species exists on or adjacent to the
property. Field surveys found that while the Marolt Open Space is heavily used by people, it
does provide important wildlife habitat. Higher wildlife species richness and abundance
correlated directly with areas of lower human activity and greater habitat complexity, and
lower wildlife species richness was detected in areas of heavy human use and low habitat
complexity (primarily smooth brome pasture). CWS noted that little mule deer sign was
detected on the south side of the garden and aspen/cottonwood grove where people were
observed exercising their dogs, while substantially more mule deer sign, including the fawn,
was observed on the north side where no dog activity was noted. While no direct or
indirect observations of American black bears, coyotes, red foxes, or Wyoming ground
squirrels were noted during surveys, these species are very likely to use the property at
least seasonally.
2.03 VISUAL RESOURCES
The view planes associated with the Marolt Open Space offer outstanding scenic values and
are among the property’s most important resources. Whether seen by visitors and
residents entering or leaving Aspen on Highway 82, or by people recreating and commuting
on the property, the expanses of open meadow edged by rustic buck-rail fence and stands
of trees are a visual respite in this area of the valley floor located at the west entrance to
Aspen.
25 Scenic views at Marolt Open Space in summer and in winter
View planes also extend to the greater surroundings, including the valleys of Maroon,
Castle, and Hunter Creeks and the Roaring Fork River. In this way, the Marolt Open Space is
both a visual hub in the space where major valleys converge, as well as a functional hub
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where trails link major parts of the Aspen community. Community decisions to preserve
this landscape as open space reflect local values and vision for future posterity.
In addition to the open, undeveloped expanses of land, historic buildings and other historic
features are important and valuable visual resources. The Marolt Barn which houses the
Holden Marolt Mining and Ranching Museum has been a beloved Aspen landmark for well
over a century. Best seen by visitors to the open space property, the barn is surrounded by
other historic buildings, implements and machinery, and foundations of the former Holden
Lixiviation Works, all of which create a setting in which two of Aspen’s historic industries,
mining and ranching, are displayed. This site was recognized as a historic district and listed
on National and State Registers of Historic Places in 1990.
2.04 HISTORICAL RESOURCES
Historical resources on the property relate primarily to the lixiviation mill complex, Midland
Railroad, and ranching and farming activities. Reports from various historical surveys
document many of these resources; see Appendices C, D, E, and F. The historic Holden
Lixiviation Works site is on the National Register of Historic Places and the State Register of
Historic Places.
COLORADO MIDLAND RAILROAD
Remnant sections of the berm on which the Colorado Midland
Railroad tracks once lay run along the south side of the Aspen
Community Garden and the stand of trees to the west of the
garden. Rusty railroad spikes may be found along the trackway.
HOLDEN LIXIVIATION WORKS
There are three main existing buildings from the lixiviation
complex, all of which have been altered substantially over the
years for various uses. The Office/Assay Office is located
within a stand of trees to the west of the main historic
complex. This house is commonly known as the Opal Marolt
House and is currently in use as City of Aspen employee
housing. An additional building that is thought to have
originated as part of the lixiviation mill complex is located near
the Assay Office/House and is currently used as a garage. The
Sampling Works is the largest of the existing buildings and is commonly known as the
Marolt Barn. It is currently in use as the main facility of the Holden Marolt Mining and
Ranching Museum operated by Aspen Historical Society. The Salt Shed to the south of the
Sampling Works is currently used as a workshop associated with the museum.
26 The Colorado Midland
Railroad's tracks once lay on this
berm, now overgrown with
native shrubs
27 Historic Assay Office/Opal
Marolt House and garage, currently
City of Aspen Employee Housing
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MAROLT OPEN SPACE MANAGEMENT PLAN | 29
28 Sandstone foundations and walls, and wooden stamp piers that are part of the ruins of the historic Holden Lixiviation
Works
In the vicinity of the Sampling Works and Salt Shed,
there are many pieces of historic equipment and
machinery, and several small historic buildings
related to silver mining and ranching. The small
buildings were moved to the site from other
locations in the Aspen area. Of the equipment and
machinery, some items are original to the site and
others have been relocated to the site as outdoor
museum displays. Piles of original bricks, other
materials, and land features also exist in this area.
Remnant sandstone foundations, wooden piers, and
other features of the main mill building exist on the
steep slope above the west bank of Castle Creek. An
old road, now part of the Bergman Trail, exists to the
north of the mill foundations. On the flat bottom land
to the east of the mill foundations lie the stone
foundations of two powerhouses. The ruins of the
original cable derrick lie near the derrick replica which
stands on the original footprint of this structure
between the powerhouse foundations and the mill
foundations. In this general vicinity, historic pieces of
metal equipment and land features exist.
29 Brick pile at the historic lixiviation site
30 Cable derrick replica built in 2016
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RANCHING
Irrigation ditches on the property originate in part from the flume
and ditch system that was built to bring water from Castle Creek
to the lixiviation mill site. Additional ditches were built later to
create a system for irrigating the land for ranching and farming
purposes. The existing Sampling Works/Marolt Barn, Salt
Shed/Milking Barn, and Assay Office/Opal Marolt House were
originally built as part of the lixiviation mill complex, and when the
site was transitioned from ore-processing to ranching and farming
purposes in the 1940s, these buildings were altered many times.
Today they show evidence of both mining and ranching uses. The
small building near the Assay Office/Opal Marolt House is thought
to have originated as part of the lixiviation mill complex. It was
used by the Marolt family to store farm implements and now
serves as a garage/storage building.
To the north of the historic mill complex in
a thickly vegetated strip between two
gravel access roads, there is a partially sub-
terranean, peaked-roof structure that is
thought to be a historic potato cellar. This
structure is still standing, yet it is very
weathered with large holes in the roof and
appears to be in a state of gradual collapse.
It contains historic furniture and
equipment presumably related to potato
storage and/or other functions that the
building may have served. The two large
meadows on the property vegetated
primarily by smooth brome grass were
historically converted to hay grasses for
hay production and grazing during the property’s ranching era. Existing ditches in these
meadows were built by past ranchers in order to flood or sheet irrigate the hay crop.
Remnants of ranching-era fences, gates, and equipment also exist on the property.
33 Historic ranching era fences and wagon ruins
32 Historic structure thought to be a potato cellar from the
property's ranching era
31 Small lateral irrigation ditch
built during the ranching era
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MAROLT OPEN SPACE MANAGEMENT PLAN | 31
2.05 EXISTING PLANS AND POLICIES
City of Aspen Zoning Definitions Applicable to the Marolt Open Space
The City of Aspen’s Open Space Zone district [26.710.260Open Space (OS)] is defined as:
A. Purpose. The purpose of the Open Space (OS) Zone district is to preserve, protect and
enhance lesser developed or undeveloped areas within the City containing unique naturally
occurring or manmade landscape features which provide visual relief and enjoyment while
reflecting or presenting community artistic or architectural statements. Development in the
Open Space (OS) Zone District should emphasize and be consistent with the natural
dynamic state of the land and minimize disruption of existing natural conditions.
B. Permitted uses. The following uses are permitted as of right in the Open Space (OS) Zone
District: 1. Paved and unpaved walkways. 2. Benches. 3. Sculpture. 4. Water features such
as ponds, streams or fountains. 5. Architectural lighting and downcast low-illumination
lighting for walkways and trails .6. Sculptured or manicured landscape features. 7. Fencing.
C. Conditional uses. None
The City of Aspen’s Land Use Code Part 700, P zone Page 1 26.710.240 Park (P) is defined as:
A. Purpose. The purpose of the Park (P) Zone District is to ensure that land intended for
recreation use is developed so as to serve its intended use, while not exerting a disruptive
influence on surrounding land uses.1.When a Park (P) Zone District is designated with a
Transportation Overlay (T) Zone District designation, its purpose is to provide for the use of
for both parks and public transportation facilities in the most compatible manner
practicable, but with the park character remaining dominant.2.When a Park (P) Zone District
is designated with a Drainage Overlay (D) Zone District designation, its purpose is to provide
for the use of both park and drainage system facilities in the most compatible manner
practicable, with the park character remaining dominant.3.When the Park (P) Zone District
is designated both with the Transportation Overlay (T) Zone District and the Drainage
Overlay (D) Zone District, its purpose is to provide for the use of parks, public transportation
facilities and drainage system facilities in the most compatible manner practicable, with the
park character remaining dominant.4.When the Park (P) Zone District is designated Golf
Course Support (GCS) Overlay Zone District, its purpose is to provide for the use of public
golf courses and adjacent support facilities in the most compatible manner practicable, with
the park character remaining dominant.
B. Permitted uses. The following uses are permitted as of right in the Park (P) Zone
District:1.Open-use recreational facility, park, playfield, playground, swimming pool, golf
course, riding stable, nursery, botanical garden; and2.Accessory buildings and uses.
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32 | MAROLT OPEN SPACE MANAGEMENT PLAN
C. Conditional uses. The following uses are permitted as conditional uses in the Park (P)
Zone District, subject to the standards and procedures established in Chapter
26.425:1.Recreation building.2.Sport shop.3.Restaurant facility.4.Park maintenance
building.5.Farmers' market, as defined in Section 26.04.100, provided: a. It operates
no more than two (2) days per week, unless modified by the Commission under the
conditional use review; b. It opens to the public no earlier than 7 a.m. and closes no later
than2 p.m., unless modified by the Commission under the conditional use review; and City
of Aspen Land Use Code Part 700, P zone Page 2c.It shall be limited to those weeks that fall
between the first Saturday in June and the weekend following the Thanksgiving holiday,
inclusive, unless modified by the Commission under the conditional use review.
D. Dimensional requirements. The dimensional requirements which shall apply to all
permitted and conditional uses in the Park (P) Zone District shall be set by the adoption of a
Final Planned Development approval granted pursuant to the provisions of Chapter 26.445,
Planned Development.
The City of Aspen’s Public Zone district [26.710.250Public (PUB)] is defined as:
A. Purpose. The purpose of the Public (PUB) Zone District is to provide for the development
of governmental, quasi-governmental and nonprofit facilities for cultural, education, civic
and other nonprofit purposes.
B. Permitted uses. The following uses are permitted as of right in the Public (PUB) Zone
District: 1. Library; 2. Museum; 3. Post office; 4. Hospital; 5. Essential governmental and
public utility uses, facilities, services and buildings (excluding maintenance shops); 6. Public
transportation stop; 7. Terminal building and transportation-related facilities; 8. Public
surface and underground parking areas; 9. Fire station; 10. Public and private school; 11.
Public park; 12. Arts, cultural and recreational activities, buildings and uses; 13. Accessory
buildings and uses; 14. Public and private nonprofit uses providing a community service;
and 15. Child care center.
The City of Aspen’s Low-Density Residential Zone district [26.710.080Low-Density
Residential (R-30)] is defined as:
A. Purpose. The purpose of the Low-Density Residential (R-30) Zone District is to provide
areas for long-term residential purposes, short term vacation rentals, and customary
accessory uses. Recreational and institutional uses customarily found in proximity to
residential uses are included as conditional uses. Lands in the Low-Density Residential (R-
30) Zone District are typically located along river frontages in outlying areas of the City.
B. Permitted uses. The following uses are permitted as of right in the Low-Density
Residential (R-30) Zone District: 1. Detached residential dwelling. 2. Duplex. 3. Home
occupations. 4. Accessory buildings and uses. 5. Accessory dwelling units and carriage
houses meeting the provisions of Chapter 26.520.6. Vacation Rentals. Pursuant to Section
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MAROLT OPEN SPACE MANAGEMENT PLAN | 33
26.575.220C. Conditional uses. The following uses are permitted as conditional uses in the
Low-Density Residential (R-30) Zone District, subject to the standards and procedures
established in Chapter 26.425:1. Arts, cultural and civic uses. 2. Academic uses. 3.
Agricultural uses. 4. Recreational uses. 5. Group home. 6. Childcare center. D. Dimensional
requirements.
C. Conditional uses. The following uses are permitted as conditional uses in the Public (PUB)
Zone District, subject to the standards and procedures established in Chapter 26.425.1.
Maintenance shop. 2. Affordable housing.
D. Dimensional requirements. The dimensional requirements which shall apply to all
permitted and conditional uses in the Public (PUB) Zone District shall be set by the adoption
of a Final Planned Development approval granted pursuant to the provisions of Chapter
26.455, Planned Development.
The City of Aspen’s Conservation Zone district [26.710.220Conservation (C)] is defined as:
A. Purpose. The purpose of the Conservation (C) Zone District is to provide areas of low-
density development to enhance public recreation, conserve natural resources, encourage
the production of crops and animals and to contain urban development.
B. Permitted uses. The following uses are permitted as of right in the Conservation (C) Zone
District: 1. Detached residential dwelling. 2. Park, playfield, playground and golf course. 3.
Riding stable. 4. Cemetery. 5. Crop production orchards, nurseries, flower production and
forest land. 6. Pasture and grazing land. 7. Dairy. 8. Fishery. 9. Animal production. 10.
Husbandry services (not including commercial feedlots) and other farm and agricultural
uses. 11. Railroad right-of-way, but not a railroad yard. 12. Home occupations. 13.
Accessory buildings and uses. 14. Accessory dwelling units meeting the provisions of Section
26.520.040.15. Temporary special events associated with ski areas including, but not limited
to, such events as ski races, bicycle races and concerts; with Special Event Committee
approval.
C. Conditional uses. The following uses are permitted as conditional uses in the
Conservation (C) District, subject to the standards and procedures established in Chapter
26.425.1. Guest ranches. 2. Recreational uses including a riding academy, stable, club,
country club and golf course. 3. Ski lift and other ski facilities. 4. Sewage disposal area.
City of Aspen Land Use Code Part 700, C zone Page 25. Water treatment plant and storage
reservoir. 6. Electric substations and gas regulator stations (not including business or
administration offices).
D. Dimensional requirements. The following dimensional requirements shall apply to all
permitted and conditional uses in the Conservation (C) Zone District. 1. Minimum Gross Lot
Area (acres): 10.2. Minimum Net Lot Area per dwelling unit(acres): 103. Minimum lot width
(feet): 400. 4. Minimum front yard setback(feet): 100. 5. Minimum side yard setback(feet):
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34 | MAROLT OPEN SPACE MANAGEMENT PLAN
30. 6. Minimum rear yard setback(feet): 30.7. Maximum height: twenty-five (25) feet. 8.
Minimum distance between principal and accessory buildings (feet): No requirement. 9.
Percent of open space required for building site: No requirement. 10. External floor area
ratio: (applies to conforming and nonconforming lots of record): same as R-15 Zone District.
Original PD Document for the Marolt Open Space.
There is an original PD document associated with the Marolt parcel of the Marolt Open
Space. This PD document was approved by Aspen City Council in 1982 and refers to the
conditional uses of the property. Please see Appendix O.
2012 Aspen Area Community Plan
The Aspen Area Community Plan is a guiding document written by the City of Aspen
Planning and Zoning Commission in conjunction with Pitkin County Planning and Zoning
Commission and City and County Community Development staff. This document guides the
City and County on decisions related to development, growth, transportation, the
environment, health and welfare, historic preservation, parks, recreation, and other
community aspects.
2015 Pitkin County Nordic Trails Plan
The Pitkin County Nordic Trails Plan guides the vision and implementation of the Aspen
Snowmass Nordic Trail System. The City of Aspen Parks Department is the operational arm
of the program which is funded by Pitkin County Open Space and Trails. The system is
overseen in an advisory capacity by the Aspen Snowmass Nordic Council (ASNC). Short- and
long-term goals of the ASNC are formalized within this plan, including maintenance, design
guidelines, trail diversity, future trail expansions, and sign standards for navigation and
wayfinding within the cross-country ski trail system. Within the Aspen Snowmass Nordic
Trail System, the Marolt Open Space offers a gentle, easy cross-country ski experience on
2.5 km of trails that connect to the High School ski trails on Meadowood HOA open space
and to ski trails on the Moore Open Space (Pitkin County). Dogs are permitted on the
Marolt Open Space ski trails, one of the few portions of the Nordic ski trail system where
dogs are allowed.
United States Department of the Interior, National Park Service, National Register of Historic
Places and State Office of Historic Preservation
The Holden Lixiviation Works was listed on June 22, 1990 as a historic district on the
National Register of Historic Places in recognition of the site’s historical significance. A
National Historic Register District is a defined geographical area consisting of contributing
and noncontributing properties. The listing number is 90000867 and is described as 2.5
acres and two buildings with its period of significance being 1975-1899. Historic function is
described as industry/processing/extraction and current function as recreation and culture,
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MAROLT OPEN SPACE MANAGEMENT PLAN | 35
vacant/not in use. The National Historic Register’s purpose is to identify, evaluate, and
protect historic and archaeological resources in the United States.
Such listing is defined on the National Historic Register’s webpage
(https://www.nps.gov/subjects/nationalregister/faqs.htm): “Under Federal Law, the listing
of a property in the National Register places no restrictions on what a non-federal owner
may do with their property up to and including destruction, unless the property is involved
in a project that receives Federal assistance, usually funding or licensing/permitting.” As a
National Historic Register listing, the site is automatically on the State Register of Historic
Places, Colorado State Office of Historic Preservation: Holden Mining & Smelting Co., site
number 5PT.539. Although there are no restrictions conferred by these listings, in the event
that any federal or state monies (such as a realignment of Highway 82) would be involved
with development that would impact the site, a process would be initiated per Section 106
of the National Preservation Act. A Section 106 process would involve any pertinent
agencies including local preservation entities and local ordinances in order to address
potential impacts and alternatives. Although a Section 106 process does not mandate a
preservation outcome, this consultation process would require consideration of alternatives
and/or mitigation to any impacts to listed historic resources.
Easements
There are existing utilities easements associated with the property. Please see Appendix O
for an illustration of these easements.
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2.06 CURRENT USES
For its relatively small size, The Marolt
Open Space hosts a wide variety of
important uses ranging from preserving
and interpreting one of the community’s
most significant, historic mining and
ranching sites to serving as a vital
connector space at the center of our
recreational and commuter trail systems.
Perhaps most importantly, the property’s
location gives it unique prominence as an
open, undeveloped landscape at the
entrance to Aspen. The Marolt Open
Space serves this important viewshed
purpose while at the same time hosting
the multitude of uses described below.
35 The Holden Marolt Mining and Ranching Museum
The Marolt Open Space played an important role in Aspen’s silver mining and early 20th-
century ranching eras. Historical preservation and interpretation together constitute a
significant use of the property today. The Aspen Historical Society (AHS) operates the
Holden Marolt Mining and Ranching Museum on a 1.9-acre parcel that was once at the
heart of Aspen’s historic mining and ranching activities. Housed in the Marolt barn and
adjacent salt warehouse, the museum opened in 2003, operating on a 75-year lease from
the City of Aspen that was signed in 1989. Indoor exhibits feature a 15,000-pound stamp
mill relocated from a site in the Difficult Creek drainage, a steam engine, a display of local
minerals, coal-fired boilers, and ranching-era implements, photographs, clothing, tools, and
more. Outdoor exhibits include mining and ranching machinery, carts, a steam-powered
saw for milling raw lumber, and other equipment. AHS conducts tours, school programs,
and special community events at the museum site.
34 The character of the Marolt Open Space stems in large part
from its views and green spaces
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MAROLT OPEN SPACE MANAGEMENT PLAN | 37
36 The museum site is leased and operated by Aspen Historical Society
Below the AHS leased parcel on an area of flat bottomland adjacent to Castle Creek, the
Bergman Trail descends an old road cut and loops past the massive sandstone foundations
of the lixiviation plant, foundations of two powerhouses, and a replica of a derrick structure.
Interpretive signs along this trail and at a sandstone overlook on the Marolt Trail above tell
the story of this site and the heavy industrial work that once took place here.
Other historic features on the Marolt Open Space include the old trackway of the Colorado
Midland Railroad which is a raised berm overgrown with sagebrush and other vegetation.
The standing remains of an old semi-earthen building exist to the east of the gravel
driveway in the vicinity of the Parks work staging area. This structure has a peaked roof and
contains a utility table, buckets, and other old tools, and is thought to be a potato cellar.
Small artifacts from mining and ranching activities can be found all over the property.
Recreation is another significant use of the Marolt Open Space. Paragliders and hangliders
have been using the south grass field as a landing zone since the 1970s, and presently
maintain a mowed landing strip. This area is also used by people flying kites and remote-
controlled airplanes. Other recreational uses are based on the summer and winter trails
that cross the property, including mountain and road
biking, running, walking, Nordic skiing, snowshoeing,
dog-exercising, and bird watching. For some activities,
such as biking and running, the Marolt Open Space trails
are not the destination, but rather part of a route or a
connector between other trails and areas. Groomed
cross-country ski trails are used in winter by skiers,
snowshoers, and dog-walkers. The Marolt Open Space is one of several sites within the
Aspen Snowmass Nordic Trail System where dogs are permitted.
The Aspen Community Garden constitutes the property’s agricultural use, taking place
within a fenced area in the center of the property. The garden has 77 plots that are
watered by an automatic irrigation system with water supplied from the Marolt Ditch.
Member gardeners use organic methods to grow vegetables, fruits, herbs, and flowers. The
garden facility has a pump house and tool shed as well as a loading area and 5 parking
spaces, including ADA parking.
37 A cross-country skier enjoying the groomed
trails
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38 | MAROLT OPEN SPACE MANAGEMENT PLAN
38 The Aspen Community Garden provides space for seventy-seven gardeners to grow vegetables, berries, and flowers
The City of Aspen Streets Department occasionally stores snow removed from City streets in
an area in the southern portion of the property. This is allowed periodically by Parks and
Open Space during times of high snowfall when capacity at normal snow storage areas is
inadequate. The City of Aspen Parks Department utilizes an area off the property’s gravel
driveway as a staging and work area with a compost pile. Additionally, a portion of Power
Plant Road and a small portion of the Streets Department facilities adjacent to Power Plant
Road are within the Marolt Open Space boundary in the northeast corner of the property.
2.07 ADJACENT LAND USE
The Marolt Open Space is surrounded by a variety of public and private lands. Some of the
adjacent properties have specific easements, rights of way, recreational uses, and access
that relate to management considerations for the Marolt Open Space.
To the south and east there are private residential properties, portions of the banks of
Castle Creek, and the Castle Creek Pedestrian Bridge which connects the Marolt Open Space
to residential neighborhoods and to the downtown core via the Hopkins Street Bike-
Pedway. To the northeast is Power Plant Road, the City of Aspen Streets Department Shop,
a Black Hills Energy pump station, Bugsy Barnard Park, and the Holy Cross Open Space. A
spur of the Marolt Trail connects to an underpass beneath Castle Creek Bridge along the
northeast boundary of the property.
The northwestern portion of the property is bounded by Highway 82, across from which is
located the City of Aspen Parks Department Headquarters, Thomas Estate Park, City of
Aspen Golf Course, the Roundabout, a RFTA bus interchange area, and bus stops. To the
west, the Marolt Open Space is bounded by a portion of Maroon Creek Road. Here, a
ped/ski bridge over Castle Creek Road connects the Marolt Trail with the High School Trail,
Hospital Trail, and another ped/ski bridge over Maroon Creek Road accessing the Moore
Open Space which is a Pitkin County Open Space and Trails property.
To the south, the Marolt Open Space is bounded by Castle Creek Road, across from which
are located the Aspen Chapel, the Aspen Chapel Lot which is a Pitkin County Open Space
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MAROLT OPEN SPACE MANAGEMENT PLAN | 39
property, Meadowood residential neighborhood, Whitcomb Terrace Senior Center and
Housing, Aspen Hospital, Pitkin County Health and Human Services, and Castle Ridge
Apartments.
There are easements related to waterlines, public utilities, emergency access, and irrigation
ditches on the Marolt Open Space property. Plats describing these easements are located
in Appendices H and O.
2.08 ACCESS, PARKING, AND TRAILS
Access to the Marolt Open Space in the non-winter months is provided primarily by the
many multi-use trails that enter and intersect the property as well as by two roads providing
vehicular access and public parking in several locations. Winter access is provided by Nordic
ski trails and limited residential vehicular access. The Marolt Open Space, situated between
downtown Aspen, major community amenities, residential areas, the valleys of Castle and
Maroon creeks, and the Roaring Fork River, is a vital central link in local multi-use and cross-
country ski trail systems. Bike and pedestrian traffic across the property is high in volume
year-round, and represents recreational, commuter, and school users.
VEHICULAR ACCESS AND PARKING
Marolt Place is a paved road that enters the property from Castle Creek Road, providing
access to parking, facilities, and housing at the Marolt Ranch Employee Housing complex.
There is a small, gravel, public parking area at the beginning of Marolt Place where it leaves
Castle Creek Road. Vehicular access is also provided by a gravel road that enters the
property off of Highway 82 near Castle Creek Bridge. Three public parking spaces exist at
the beginning of this road. Where the road splits, the eastern portion goes through a Parks
Department work area and continues to the Holden Marolt Mining and Ranching Museum
complex. The western portion of the gravel road accesses a City of Aspen employee
housing unit, with a spur to the west that goes to the Aspen Community Garden. In the
vicinity of the garden there are 5 parking spaces, one ADA access parking space, and a
loading area.
The gravel road entering the property from Highway 82 and Marolt Place is plowed for
winter vehicular access. There is additional parking in the Pitkin County Open Space and
Trails parking lot adjacent to the Aspen Chapel. There is no winter public parking within
the property.
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TRAILS
The primary trail within the Marolt Open Space is
the Marolt Trail, an 8-foot-wide, paved, multi-
use trail that runs in an arc inside the perimeter
of the property. The western end of the Marolt
Trail begins at the ped/ski bridge over Castle
Creek Road, and the southern end of the Marolt
Trail begins at a crosswalk on Castle Creek Road
in the vicinity of a RFTA bus stop that serves the
Pitkin County Health and Human Services /
Aspen Hospital campus and residential
neighborhoods on both sides of Castle Creek
Road. The portion of the Marolt Trail that
descends the hill from the crosswalk at Castle
Creek Road to Marolt Ranch Employee Housing is lit at night by three overhead lights.
Trail access into the property and connecting to the Marolt Trail is provided as follows. The
Castle Creek Pedestrian Bridge accesses the property from Eighth Street in Aspen’s western
residential zone and connects to the Marolt Trail adjacent to the site of the Holden Marolt
Mining and Ranching Museum. The Castle Creek Underpass Trail goes beneath the Castle
Creek Bridge/Highway 82, providing access to the Marolt Trail from Bugsy Barnard Park and
the bike/ped trail on Castle Creek Bridge/Highway 82. This underpass trail is lit at night by
lighting on a metal railing. The ped/ski bridge over Castle Creek Road provides access to the
property from the High School and Hospital Trails. This bridge was replaced in fall 2019 due
to damage caused by a truck that hit the bridge. A paved spur trail starts at Castle Creek
Road and climbs the hill to join the Marolt Trail at the Castle Creek ped/ski bridge.
A number of soft-surface, single-track trails enter the property and intersect within the
large, open, grassy field to the south of the Aspen Community Garden (the paraglider
landing field), and another footpath loops around the garden to the north. Many of these
soft-surface, single-track trails and footpaths are unofficial social trails that have developed
as a result of people bee-lining from point to point or simply by using a favorite route
repeatedly until a trail develops. Several of these trails have recently become double and
triple track trails where people walk side-by-side. New social trails have recently developed
in several areas that were undergoing revegetation following impacts from irrigation and
ditch work.
In winter, the Marolt Open Space hosts a portion of the Aspen Snowmass Nordic Trail
system, providing access to cross-country skiers and snowshoers. Throughout most of the
Aspen Snowmass Nordic Trail System, the groomed trails are open to use by cross-country
skiers and snowshoers only; however, the winter trails on the Marolt Open Space provide
one of several groomed trail areas within the system where winter recreationalists are
permitted to bring dogs. Groomed Nordic ski trails enter the property at the Castle Creek
39 Biking to school on the Marolt Trail
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MAROLT OPEN SPACE MANAGEMENT PLAN | 41
Pedestrian Bridge, the ped/ski bridge over Castle Creek Road, and at a trail that connects
across Castle Creek Road from the High School Nordic trails. The cross-country ski trails
form several loops within the property. The majority of the Marolt Trail is plowed in winter
with the exception of a portion near the Holden Marolt Mining and Ranching Museum site
where the Nordic ski trail is groomed across the full width of the trail.
40 This 2018 aerial image documents the network of social trails on the Marolt Open Space
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42 | MAROLT OPEN SPACE MANAGEMENT PLAN
2.09 RECREATION
Many forms of recreation are enjoyed by the public on the Marolt Open Space. Recreation
is described for snow-free months and winter below.
SNOW-FREE MONTHS
Paved and soft-surface trails crossing the property
are used by cyclists (both recreational and
commuter), runners, walkers, birdwatchers, and
people exercising their dogs. The open grass
meadow in the southern portion of the property is
used as a landing space for paragliders. This area
is also used for flying kites and remote-control
aircraft. The pond is used for dog exercise, and
skills practice for stand-up paddle boarding and
kayaking.
WINTER
The City of Aspen Parks Department grooms
Nordic ski trails on the Marolt Open Space as part
of the Aspen Snowmass Nordic Ski Trails System.
On this open space property, walking,
snowshoeing, and dogs are also allowed on the
Nordic ski trails.
2.10 WATER RIGHTS AND
INFRASTRUCTURE
The ditch system on the Marolt Open Space was created when the land was converted from
native vegetation to ranching and farming uses well over a century ago. The City of Aspen
gained ownership of water rights associated with the Thomas and Marolt parcels at the
time each of these properties were acquired by the City’s Open Space Program, 1982 and
1983 respectively. See Water Infrastructure Map, Appendix H.
There are two water rights that have historically irrigated the Marolt Open Space and
surrounding lands. The Holden Ditch that diverts from the west bank of Castle Creek is
Priority 613 and has an Appropriation Date of 8/27/1950 for a City of Aspen ownership of
25.4 cfs. The Marolt Ditch is Priority 279 and has an Appropriation Date of 3/1/1902 for a
City of Aspen ownership of 13.6 cfs. Minority shareholders on the Marolt and Holden
Ditches include Castle Creek Homeowners Association and Red Butte Cemetery. In
42 Cross-country skiing, Courtesy Anna
Stonehouse, Aspen Times
41 Paragliders land on the Marolt Open Space
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addition, homeowners on Cemetery Lane are encouraged to enter a Raw Water agreement
with the Water Department to irrigate their properties with ditch water.
The Holden Ditch enters the Marolt Open Space property and flows through a splitter box
that directs water to the Marolt Wetlands pond. The main Holden Ditch continues to the
west and enters a second splitter box that delivers water northeast to Red Butte Cemetery,
the Aspen Community Garden, and the City of Aspen Golf Course irrigation pond. The
water continues northwest past the second splitter box and fills an irrigation pond on the
west side of the property. The water then continues past the pond and under the
Roundabout to the City of Aspen Golf Course open ditch system.
The Marolt Ditch enters the Marolt Open Space property and flows to the west through a
Parshall flume and combines with the Holden Ditch just to the East of the Aspen Community
Garden above the garden’s irrigation pump station. The combined Holden and Marolt Ditch
water continues under Highway 82 to the Aspen Golf Course main irrigation pond and north
through the Cemetery Lane neighborhood. This combined ditch water also supplies the
Castle Creek Homeowners Association water right on the east side of Cemetery Lane. A
number of small ditch laterals that are not enumerated exist on the property and are
important to the use of the water rights.
Per the State of Colorado, Division of Water Resources, owners of water rights are required
to put water to beneficial use without waste. The City of Aspen uses water conveyed by the
Holden and Marolt Ditches to irrigate the Aspen Golf Course, the Aspen Community Garden,
and Cemetery Lane neighborhoods. There is potential for the City to use this water also to
irrigate the former hay meadows on the Marolt Open Space.
Prescriptive easements exist along the Holden and Marolt Ditches, providing 15 feet of
space on either side from the centerline of the ditches. These easements protect access for
ditch maintenance work; no development may occur within the easements.
Wetlands and a pond were created on the Marolt Open Space upstream of the combined
Holden Marolt Ditch in 1999 as part of mitigation for the loss of wetlands due to
construction of the Roundabout and surrounding highway and road areas.
Summary of Water Ditches on the Marolt Open Space
Name Adjud.
Date
Approp.
Date
Priority
#
Absolute
cfs
City Ownership cfs Decreed Use
Marolt
Ditch
7/25/1934 3/1/1902 279 18.6 13.6 Irrigation,
Other
Beneficial
uses
Holden
Ditch
10/24/1952 8/27/1950 613 30 25.4 Irrigation,
domestic
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2.11 SIGNAGE
A variety of signage exists at the Marolt Open Space, including the white typeface/green
background style used by the Parks Department for place names and other purposes on
open space properties and trails. Parks also uses winter seasonal signs on the property
related to the cross-country ski trails. Additional signage, both seasonal and permanent,
identifies pet waste bags dispensers and trash receptacles.
Other entities such as the paragliding community and community garden volunteers have
installed various signs in different styles to serve different purposes in the areas in which
their activities take place. The Aspen Historical Society has installed various signs within
their leased area pertaining to the Holden Marolt Mining and Ranching Museum and its
outdoor exhibits and interpretive elements.
This integrated approach to signage on the Marolt Open Space provides visitors and user
groups with necessary wayfinding, orientation, directional, safety, interpretive/educational,
and other information. Examples are provided in the following photo collage.
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3. PUBLIC AND STAKEHOLDER COMMENTS
The Marolt Open Space Management Plan has been developed in coordination with input
from the public and stakeholders. A process timeline is provided in Section 1.03 Process
and Public Involvement. Appendix K contains public comments received. Comments were
gathered from the following groups and entities: Aspen Snowmass Nordic Council, Aspen
Historical Society, Aspen Community Garden, Marolt Ranch Employee Housing, and
commercial operators. These comments, along with staff input, advice from the City of
Aspen Open Space and Trails Board, and existing conditions, help guide the development of
Action Items for the future management of the Marolt Open Space.
3.01. PUBLIC COMMENTS
The first public comment period was open from June 25 through July 12, 2019. A public
open house event was held on June 25, 2019 at the Red Brick Center for the Arts in Aspen,
and an on-site outreach event was held at the Marolt Open Space the following morning.
Forty-six comments were received from the two outreach efforts. Additionally, the Parks
Department received 119 comments/answers to their online public survey at
www.marolt.aspenparks.com.
General comments received online are provided in Appendix K. Written comments were
also received during the public open house and on-site outreach events held in June 2019.
The written comments addressed a wide variety of input including improving roads and
access routes, environmental health and sustainability, preservation of the open space
without change, and developing amenities such as a bike park. Many comments were
related to the benefits of the historical resources on the property. Other suggestions
included selecting one of the many social trails to designate as an official single-track, soft-
surface trail across the Marolt Open Space and providing a shelter for the portable toilets at
the Community Garden. The most common theme from the general comments was the
desire to leave the Marolt Open Space primarily unchanged. It is not lost on the public,
based on the number of comments, that the Marolt Open Space speaks volumes to the
community’s values as reflected by its role in the entrance to Aspen. The citizens of Aspen
place a high degree of importance on preserving and maintaining natural open spaces such
as this property in and around town.
The online survey generated themes and provided valuable feedback through scores
participants provided in response to the survey’s 10 statements. Answers to the survey
were scored on a scale from “Strongly Disagree” (1) to “Strongly Agree” (5). Average
scores from the 119 participants’ answers were calculated to provide a measure of the
public’s opinion on each topic. These scores and resulting themes are summarized here:
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1. The current trail system on Marolt Open Space meets the needs of the users.
This scored a 3.65, indicating that survey respondents generally agree.
2. The public is indifferent to the closure of the unauthorized social trails, scoring
2.5.
3. The public is also indifferent to slightly agreeable to the idea of haying, which
scored 2.8.
4. Preservation of historical sites is very important to survey respondents, scoring
4.57.
5. Survey respondents were indifferent to slightly agreeable to the idea of a bike
park which scored 2.8.
6. Preservation of landscape and ecological integrity is very important, scoring 4.34.
7. Most people surveyed felt that the Marolt Open Space is an appropriate place to
walk dogs, scoring 3.86.
8. Most people believe that the Community Garden functions well and that no
change is necessary, scoring 3.77.
9. Most people think that the fencing and irrigation around the Community Garden
are appropriate, scoring 3.74 out of 5.
10. The current multi-use nature of the Nordic Trail system is appropriate, scoring
4.1 out of 5.
Most people use the space either daily or weekly. Use on a less frequent basis is not nearly
as common. This speaks to the high number of respondents that live in the area and use
Marolt Open Space as a commuting route or a daily recreation area.
The second public comment period was open from March 3rd, through March 31st, 2021
through Aspen Community Voice. The site had 487 total visits and 67 active contributors. In
addition the parks department received emails and direct phone calls from the community.
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Commercial use at the Marolt Open Space is not uncommon. Aspen Paragliding, for
example, has been using the space in the south grass meadow as a landing zone for about
30 years. Most of the people surveyed feel that a certain amount of commercial operation
on the property is an appropriate use of the open space. The table below illustrates the
public’s perception of commercial uses which should be allowed on Marolt Open Space.
Paragliding and historical tours received the strongest support.
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3.02 Aspen Snowmass Nordic Council
Comments from Aspen Snowmass Nordic Council (ASNC) pertaining to the Marolt Open
Space state that the groomed cross-country ski trails are used daily during the Nordic skiing
season and that this trail system meets ASNC’s needs. ASNC appreciates the Holden Marolt
Mining and Ranching Museum as an amenity on the property. They acknowledge winter fat
biking as an allowed activity on the Marolt Open Space Nordic trails, but prefer not to allow
a bike park that would operate during the period from Thanksgiving through March.
Preservation of the landscape and ecological integrity are important. ASNC acknowledges
that the Marolt Open Space provides one of the prime dog-walking areas within the
Aspen/Snowmass Nordic Trail System, and that this multi-use designation should continue
with the condition that pet owners must properly dispose of pet waste and maintain control
of pets. Aspen Valley Ski and Snowboard Club’s Nordic Program uses the groomed trails for
training, and other user groups include paragliders and Aspen Historical Society. ASNC feels
that the current multi-use purpose of the winter trails is appropriate, but that the
management plan should delineate approved activities. The unique location of the Marolt
Open Space provides multi-use access to trail users and therefore reduces pressure for
multi-use needs on other sections of the system such as the Moore Open Space Nordic
Trails and High School Nordic Trails.
3.03 Aspen Historical Society
Comments from Aspen Historical Society (AHS) include the following suggestions: 1) Direct
vehicular access onto the gravel road that leads straight to the museum site and not on the
driveway/road that goes to the employee housing and garden. 2) Improve/add permanent
signage including state signage for the historical museum on Highway 82 and wayfinding
signage on the Marolt Open Space to direct visitors to the museum, one location being at
the start of the two gravel roads off Highway 82. 3) Relocate the compost pile. 4) Retain
the existing cement slab for guest parking, expand parking, and provide space for a
bus/shuttle turn-around and trucks/other large vehicles. 5) Add stop signs for traffic and
rumble strips on the trail where the Marolt Trail and access road intersect near the
museum. 6) Remove dead cottonwood trees along the road to the employee housing and
garden. 7) Restore and preserve the historic potato cellar. The cellar is outside of the AHS
leased area; however, it is a historical asset that AHS would like to interpret.
3.04 Aspen Community Garden
The Aspen Community Garden (ACG) expressed the following comments: Continue and
adjust as needed the partnership with City of Aspen Parks Department for garden
maintenance related to irrigation, compost, port-a-potties, etc. Retain the access road to
the garden and associated parking spaces, as well as ADA access and parking and access to
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trash and compost dumpsters. ACG expressed no changes to management, continuing with
an annual or semi-annual meeting with Parks, and better communication regarding projects
that may impact access to the garden.
3.05 Marolt Ranch Employee Housing
Marolt Ranch Employee Housing expressed the need for clarification on the proper
authority for enforcing parking regulations along Marolt Place.
3.06 Commercial Operators
ASPEN PARAGLIDING
Alex Palmaz provided the following comments on behalf of Aspen Paragliding:
Aspen Paragliding prefers little change from the current uses and management for Marolt
Open Space and opposes any development of the property such as playing fields, employee
housing, and highway realignment. Aspen Paragliding suggests describing and designating
in the Marolt Open Space Management Plan a ‘Flight Park’ and Memorial for Scott Bloom.
This area includes the space currently used for landing and folding and breaking down
gliders with adjacent benches and trash and pet waste receptacles. Other suggestions
pertaining to maintenance of the open space property include irrigating and haying the
grass fields, as tall grass contributes to difficult landing conditions; trimming or thinning
trees along the south side of the landing area, as these trees generate air currents that are
of concern to pilots; and manage commercial permittees toward proper land uses,
insurance coverage, and operational safety plans.
3.07 Other Stakeholders
ASPEN PARAGLIDING COMMUNITY
Terry Paulson provided the following comments on behalf of the local paragliding
community: Restore the buck rail fence on the property along Highway 82; top or replace
trees with vegetation less than twelve feet tall; reduce the number of social trails; enforce a
leash law and cleaning up pet waste; educate the public to walk single file on single track
trails to avoid developing multiple parallel trails; consider irrigating grass meadows;
discontinue storing snow on the property to reduce safety hazards (gravel, glass, etc.) and
vegetation impacts; discontinue use of the west side of the Thomas parcel as a staging area
for construction gravel and soil piles; slow down the bike traffic on the Marolt Pedestrian
Bridge; develop signage to designate the paraglider landing area and eliminate bike traffic
that short-cuts through this area, including Tuesday night organized bike events; eliminate
potential for a ‘straight-shot’ realignment of Highway 82 through the property.
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ROARING FORK MOUNTAIN BIKING ASSOCIATION
Mike Pritchard provided the following comments on behalf of Roaring Fork Mountain Biking
Association (RFMBA): The single track trails on the Marolt Open Space extend the single
track experience for mountain bikers between downtown Aspen and trails such as
Government Trail, Oregon Trail, Sky Mountain Park trails, etc. The single-track trails on the
Marolt Open Space are included as components of the IMBA-rated Epic Ride ‘Aspen
Snowmass Mega Loop.’ Marolt Open Space single track trails offer an introductory
experience to young and beginning riders. Improve signage to designate the preferred
single-track route on the west end of the property. RFMBA supports the concept of a fully
featured bike park on the Marolt Open Space. In the near term, RFMBA supports small
scale pump tracks or featured internal loop trails. The Marolt Open Space also allows
winter fat bike riding, a recreational activity for which there are limited opportunities in the
Aspen area.
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4. OPPORTUNITIES AND PLANNING ISSUES
4.01 Overview
The Marolt Open Space provides unique and beloved view planes at the entrance to Aspen
that are treasured by locals and visitors alike. The property also serves as a high-use area
for recreation including cross-country skiing, paragliding, biking, running, hiking, exercising
dogs, and more. Wildlife use the various habitats on the property for resting and hiding
cover, foraging, and as a valuable corridor for movements among adjacent habitat spaces
including the gorge of Castle Creek, Shadow Mountain, and the Moore Open Space. The
property’s diverse vegetation communities are used by breeding birds for nesting and by
migratory birds for feeding and resting during stopovers. The rich historical resources on
the property present many opportunities for ongoing preservation and interpretation.
4.02 Land Use Restrictions
The Thomas parcel is zoned (C) Conservation and the Marolt parcel is zoned R-30 Low
Density Residential. It is possible that developments such as housing and a realignment of
Highway 82 could occur on the property.
Approvals currently exist for the modified direct alignment of Highway 82, which would
cross the Marolt Open Space. Housing could also be approved on portions of the Marolt
parcel. Aspen City Council, Planning and Zoning, and Parks administrative review along with
community input would be required should any such future development be proposed. The
Thomas parcel is under conservation zoning. The Aspen Historical Society holds a 75-year
lease (as of 1989) on the Holden Marolt Mining and Ranching Museum site. The Marolt
Ranch Employee Housing is occupied and requires the existing Marolt Place Road. Changing
access to the Holden Marolt Mining & Ranching Museum will be a challenge.
Please see Section 2.05 Existing Plans and Policies for detailed information on zoning and
other land use restrictions.
4.03 Maintenance
An opportunity exists to explore the idea of burying the overhead utility lines that run along
the gravel driveway that access the City of Aspen Employee Housing home and the Aspen
Community Garden.
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4.04 Natural Resources
A variety of habitat types exist on the Marolt Open Space, serving as home to many
different wildlife and plant species. An opportunity exists to preserve existing habitat, for
example, the cottonwood-red osier dogwood community adjacent to Castle Creek, which
has high ecological preservation value.
A large portion of the Marolt Open Space property consists of non-native grass meadows to
the north and south of the Aspen Community Garden. If no management actions take
place, the native shrub community will gradually take over these meadows, changing the
character of the property. If a return to all native grasses and forbs is desired, inputs will be
required to achieve the desired outcome within a reasonable timeframe. Additionally, both
of these management approaches present a challenge because they would be incompatible
with any future opportunities for managing these areas as irrigated pasture.
4.05 Historical Resources
There is a long and rich history associated with the Marolt Open Space which is captured
and celebrated at the Holden Marolt Mining and Ranching Museum located on the property
(operated by Aspen Historical Society, AHS). This museum is centrally located within the
property where access is challenging, and no obvious access or parking solutions exist. AHS
experiences difficulties with drawing in guests and visitors due to the difficulty they
experience in trying to navigate their way to the site.
While effective access is necessary for attracting visitors and for the museum’s overall
success, it is not in the interest of preserving open space to build parking lots or roads. This
is a challenge; however, there may be opportunities to create better commuting options,
better signed parking spaces around the perimeter, paths that lead directly to the museum,
and better signage on existing paths. Such opportunities can enhance the visitor experience
while preserving the character of the existing open space. The Marolt Open Space is home
not only to the Holden Marolt Mining and Ranching Museum, but it is also the site of
several other historic structures and landforms. Opportunities may exist to interpret other
such features on the property, including the historic trackway of the Colorado Midland
Railroad and the historic potato cellar. There may also be opportunities to enhance the
existing interpretive elements such as those at the historic lixiviation mill site.
4.06 Recreation and Trails
Over time, various users of the Marolt Open Space have created a network of social trails on
the property. These social trails receive little management attention because they are not
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part of the official trail system. Opportunities exist to identify one or more appropriate,
soft-surface, single-track trail route(s) through the property that would be adopted into the
trail system and for which the Parks Department would develop signage and provide
maintenance. The other social trails could then be closed and revegetated. Maintaining the
functionality of the existing ditch system designed for sheet or flood irrigation across the
grass meadows must be considered with all proposed trail changes so that any potential
future use of this system is not impaired, and that the irrigation system remains intact.
The paragliding community has been maintaining a portion of the south meadow as a
landing area for many years. Paragliders are iconic in Aspen’s local scene. There is an
opportunity to partner with the paragliding community in order to maintain a safe landing
zone.
The community has expressed interest in developing a bike park, and the Marolt Open
Space has been suggested as a potential location. Due to restrictions in land use code
associated with the Marolt Open Space parcel, this portion of the property does not lend
itself to serving as a site for a bike park. The Thomas Open Space parcel may have potential
for development of a small bike park amenity.
Many users enjoy exercising their dogs on the Marolt Open Space property. Opportunities
exist for providing space for dog exercise and play, such as the pond at the west end of the
property and the grass meadows. Important planning issues concerning dogs include
impacts to wildlife by off-leash dogs, dog owners who may neglect pet waste, and dogs that
may be a nuisance to others using the property. Such impacts within the property are
currently high, in part due to the heavy use of the property and the increasing number of
social trails that continue to develop. While open space provides opportunities for the
public to walk and exercise dogs, these issues require management attention.
The pond at the west end of the Marolt Open Space is often used for practicing sand-up
paddle boarding and kayak-rolling techniques, providing the public with a valuable
recreational benefit. A related planning issue is managing private instructors and
commercial outfitters that must obtain a permit from the Parks and Open Space Program in
order to use the pond for classes.
4.07 Interpretation/Education
Opportunities exist to provide improved signage for the Holden Marolt Mining and
Ranching Museum, the Bergman Trail and its series of interpretive signs, the historic potato
shed, and the former Colorado Midland Railroad trackway. Further opportunities exist for
improving signage for the trail network on the property, the paraglider landing area, and
the Aspen Community Garden in order to facilitate appropriate pedestrian and bike traffic
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use of the property’s trails. The ongoing development of social trails is an important
planning and management issue.
4.08 Agriculture
The historic Holden and Marolt irrigation ditches and their associated laterals were
originally used for the lixiviation mill operation and for agriculture on the open space
property and on adjacent properties. City-owned water rights associated with the Marolt
Open Space must be used in order to be maintained. Together, these conditions present an
opportunity to use the existing ditch system to flood or sheet irrigate the historic hay
meadows toward harvesting hay that could be supplied to Cozy Point Ranch LLC, the
equestrian operation that leases part of City-owned Cozy Point Ranch Open Space.
Existing soft-surface social trails may impede the flood or sheet irrigation system, requiring
appropriate planning and management strategies to remedy associated impediments to the
flow of water. If haying were to be pursued on the property at any point in time, social
trails would need to be re-routed.
4.09 Aspen Community Garden
The Aspen Community Garden serves the community by providing space for citizens to
grow their own food. The garden was most recently expanded in 2014. There are
limitations on available space for further expansions; therefore, if the community has a
need for additional gardening space, it is advised to seek other appropriate locations.
4.10 Special Events
Special events are not typically permitted on the Marolt Open Space due to the high
potential for negative impacts on the integrity of the land and its designation as open space.
Adequate parking for special events does not exist on the property. Special events should
be limited to those requested by the Aspen Historical Society in association with their
leased space. Parking and access for such events is located at the access point from
Highway 82, along the gravel road to the Aspen Community Garden, or from Marolt Ranch
Employee Housing
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5. MANAGEMENT ACTIONS
5.01 Overview
The management actions in this document have been developed based on considerations
including the conditions of the planning area, input from professional evaluations,
comments from the community and stakeholders, and administrative direction. The overall
desired outcome is that the open space should remain relatively unchanged.
The following management actions will allow the community to continue to enjoy the many
benefits provided by the Marolt Open Space, such as its scenic views, and its historical,
natural, and recreational values. This document is meant to serve the Parks Department for
a period of ten years, at which time this plan will be reviewed and updated.
Updates may occur prior to the ten-year time period if conditions or the wishes of the
community warrant an earlier review. In these instances, the statement by Tom Baker
referenced on page 1 shall serve as a guiding statement for decisions to be considered or
reviewed:
“…perhaps most important was this parcel’s ability to serve as a key piece of open space
at the City’s west entrance; a parcel free of development making a statement about
Aspen’s image to all who travel through it.”
In general, there should be no change to the overall look and function of the Marolt Open
Space except for minor modifications that do not change the basic character and uses of the
property.
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5.02 Maintenance
o Develop and implement an overall wayfinding and signage plan for the property.
o Develop the parking lot on Marolt Place. This can be used as an information hub for
Marolt Open Space visitors. A kiosk with information and maps will help visitors
navigate the property. This parking lot will be managed by Open Space Rangers.
Add ‘no overnight parking’ signage to the west parking area.
o Replace the buck rail fence along Highway 82 with a fence of similar historic
character.
o Restore and enhance the northern entrance to the property including consolidation
of the composting and wood processing area.
o Understand the cost implications and outline the steps to burying the electrical lines
that cross the Marolt and Thomas parcels.
o Install split rail fencing along the entrance to the Holden Marolt Barn and compost
pile road.
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5.03 Natural Resources
o Allow the native shrub community to continue to expand in the meadow east of the
Marolt ditch to improve ecologically valuable habitat.
o Revegetate with native riparian shrubs in the small area to the northeast of the
derrick structure in vicinity of the Bergman Trail, and seed native grasses and forbs
on the steep banks below and to the southeast of the Marolt Mining and Ranching
Museum.
o Create pollinator habitat by planting and seeding with appropriate native wildflower
seed mixes.
o Preserve areas with natural tangles of brush and decomposing wood, such as the
cottonwoods in the strip of land between the two gravel roads in the northeast
portion of the property and the shrubs surrounding the Aspen Community Garden,
to support pollinator reproduction and overwintering habitat.
o Establish a zonal management strategy for the northeastern, central and southern
pastures within the property. The strategy would use a maintenance hierarchy to
establish three distinct zones within the property: protected, recreational and
buffer. The boundaries for these three areas would generally follow existing site
features. The formalization of trails within the property as well as seasonal closures
of the northern pasture to dogs will further support native habitat development and
wildlife use.
o Consider enhancing the existing wetland and riparian areas with expanded plantings
along the Holden and Holden Marolt Interconnect Ditches.
o Continue noxious weed management while avoiding spraying herbicides between
May 15 and July 31 to protect nesting songbirds.
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5.04 Historical Resources
o Access to the Holden Marolt Mining and Ranching Museum will be allowed for
employees of Aspen Historical Society (AHS) and the vendors and contractors that
work AHS special events or maintain the historical buildings. Such vendors and
contractors may park only on the AHS leased area. Parking on open space outside of
the AHS leased area shall require written permission by the Parks Department’s
Open Space and Natural Resource Manager or his/her supervisor.
o Formalize parking for the Aspen Historical Society on the concrete pad to the south
of the composting pile.
o Restore the potato shed to stabilize and preserve this historical structure.
o Install a 4-foot-wide crusher fines path from the Holden Marolt Mining and Ranching
Museum and AHS leased area to the historical potato shed.
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5.05 Recreation and Trails
o Partner with the paragliding community to maintain a safe landing zone.
o Designate a soft-surface, single track path that goes through the property from the
Holden Marolt Mining and Ranching Museum area, along the dirt road that goes
north to the Community Garden, and across the open meadow to the paved Marolt
Trail as it curves to climb the hill to the ped-ski bridge over Castle Creek Road. This
path will serve as a commuter path across the property as well as an important link
in area mountain bike trail routes. The dedication of this trail and the closure of the
extraneous social trails will provide greater safety for the various recreation user
groups on the property.
o Please see action items related to trails in section 5.04 Historical Resources. These
action items suggest the development of a soft-surface path to the historic potato
cellar structure.
o Allow dog play in the Marolt Pond at the west end of the property, and not in the
Marolt Wetlands.
o A permit shall be required by the City of Aspen Parks Department for all commercial
activities.
o Explore the feasibility of a developing a small bike park in the space between Marolt
Place and Castle Creek Rd. If a site is determined to be appropriate, then consider
installation and construction.
o Explore possibility of expanded Nordic trail system within the Marolt property.
o Explore the feasibility of snowmaking systems within the Marolt Open Space for
Nordic Skiing. Research water access and storage availability, power access and
snowmaking system options.
o Investigate alignments for a walking trail that is separate from the groomed Nordic
ski trail system.
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5.06 Interpretation/Education
o An overall signage plan will be developed and implemented for the property. This
plan will include, but not be limited to, open space, trails, historical resources, the
Aspen Community Garden, and the paraglider landing zone.
o Collaborate with the Aspen Historical Society to replace / create signage for
historical artifacts that are outside of their lease boundary. Including but not limited
to the historical potato shed and former railroad bed of the Colorado Midland
Railroad.
o Restore or replace the Bergman Trail interpretive panels.
o Establish information hubs for Marolt Open Space visitors. A kiosk installed on the
western side of the property, adjacent to the parking area, will provide information
and maps that will help visitors navigate the property.
o Install signage specific to the paraglider landing area and the Aspen Community
Garden in order to facilitate appropriate pedestrian and bike traffic use of the
property’s trails.
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5.07 Agriculture
o Establish a zonal management strategy for the northeastern, central and southern
pastures within the property. The strategy would use a maintenance hierarchy to
establish three distinct zones within the property: protected, recreational and
buffer. The boundaries for these three areas would generally follow existing site
features. The formalization of trails within the property as well as seasonal closures
of the northern pasture to dogs will further support native habitat development and
wildlife use.
o Maintain the non-native grass pasture in the southern/central portion of the
property for recreational use.
o Develop a water management plan for the Holden and Marolt ditches. To maintain
the City of Aspen’s water rights associated with the property, the grass meadows to
the north and south of the Aspen Community Garden may be flood irrigated by ditch
water from the Holden and Marolt Ditches. The flood irrigation will be coordinated
with other uses to ensure limited overlap and resultant damage to the existing
natural resources.
o Haying operations may proceed with up to two cuttings per year, depending on
moisture and growth during the summer. Hay produced from the site will
supplement operations at Cozy Point Ranch, a City of Aspen open space property.
5.08 Aspen Community Garden
o Provide an appropriate enclosure for the port-a-potty that is in place annually during
the gardening season.
o Provide gardener education about invasive weeds and their management.
o Provide ongoing assistance with community garden as deemed necessary by the
Open Space and Natural Resource Manager.
o Research the feasibility and necessity of expanding the current community garden.
o Study alternative locations for additional community garden space.
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MAROLT OPEN SPACE MANAGEMENT PLAN | 69
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70 | MAROLT OPEN SPACE MANAGEMENT PLAN
5.09 Special Events
o Special events on the Marolt Open Space shall be prohibited. The Aspen Historical
Society (AHS) may conduct special events on their leased area as permitted by the
City of Aspen. AHS special events that impact the area beyond their leased
boundary, including parking, will require a permit from the Parks Department.
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0100 Elk Run Drive, Suite 128 Basalt, CO 81621 (970) 618-4740 jonathan@coloradowildlifescience.com www.coloradowildlifescience.com
COLORADO WILDLIFE SCIENCE Ecological & Wildfire Research, Management & Consulting
TECHNICAL MEMORANDUM
To: Brian Long, Trail System Manager
From: Jonathan Lowsky, Principal Biologist
Date: March 21, 2024
Re: Wildlife Assessment - Aspen Skills Trails
The City of Aspen is proposing to construct bike skills trails at Marolt Open Space (OS) and
Thomas OS (Marolt / Thomas). Proposed features include a climbing trail and three descending
trails with skill building features including berms, jumps, and other rocky technical features. The
proposed location of this project (the project area) is a strip of land bounded by Marolt Place to
the north and east, Castle Creek Road to the west with Marolt Trail as the southern boundary
BACKGROUND
Colorado Wildlife Science (CWS), in collaboration with Peak Ecological Services (PES), prepared
a wildlife baseline report for Marolt / Thomas (CWS and PES 2019). The CWS field surveys found
that although Marolt / Thomas is heavily used by people, it does, in fact, provide limited habitat
for wildlife. Given that the property
is dominated by a plant community
with little structural complexity (old
smooth brome hayfields/pastures)
and the relatively high level of
human activity, the relatively low
wildlife species richness and
abundance detected and lack of
human-sensitive species was not
surprising. Frequency of wildlife
detection, whether by means of
direct observation or indirectly by
means of sign or sound, was
substantially greater wherever there is structural complexity and higher representation of native
plants (e.g., narrowleaf cottonwoods, serviceberry). More wildlife sign (e.g., mule deer tracks
and/or pellets) was detected and direct wildlife observation (e.g., songbirds) occurred more
frequently on the north side of the aspen grove and community garden on Thomas OS. We
concluded that the difference was largely due to the more frequent use of the south side by
people exercising their dogs.
Marolt / Thomas is used by mule deer (Odocoileus hemionus) throughout the non-winter months and
by Rocky Mountain elk (Cervus canadensis) during the transition periods between winter and
summer. CPW Species Activity Mapping (SAM) data for elk and mule deer includes the project area
solely as mule deer summer range.
Photo 1. Dog running at large on Thomas OS
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TECHNICAL MEMORANDUM
Wildlife Assessment ̶ Aspen Skills Trails Proposal
March 21, 2024
Page 2
METHODS
On March 8, 2024, CWS biologist conducted pedestrian surveys at Marolt / Thomas with an
emphasis on the project area. The biologist documented all directly observed wildlife and all
wildlife sign (e.g., pellets or scat, tracks) and sounds (i.e., bird songs and calls).
RESULTS
The field surveys found that conditions remain more or less unchanged since the 2019 baseline
surveys.
Detections
Three sets of coyote (Canis latrans) tracks and six sets of mountain cottontail (Sylvilagus
nuttallii) were observed. Direct observation of wildlife consisted of 6 black-billed magpie, 4
American robins, two American crows, three black-capped chickadees, two mountain
chickadees, one northern flicker, and one white-breasted nuthatch.
Although deer and elk sign was detected during the 2019 summer surveys, no sign was detected
on the properties during the March 8, 2024 survey. In 2019, CWS detected numerous
occurrences of fresh deer sign (i.e., tracks, pellet groups) as well as direct observations of deer.
Elk pellet piles were also detected in 2019 but all of the elk sign was older, from the early spring
or previous fall, with no direct observations. The deer and elk detections were concentrated on
the north side of Thomas / Marolt with relatively clear movement between Castle Creek and the
open space properties. The only detection of wildlife within the project area in 2024 was a single
Photo 2. Coyote tracks within the project area
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TECHNICAL MEMORANDUM
Wildlife Assessment ̶ Aspen Skills Trails Proposal
March 21, 2024
Page 3
set of coyote tracks and a black-billed magpie. There were no detections of deer or elk within
the project area in 2019 or 2024.
Although 55 detections of 5 to 7 mammal species (Microtine voles were detected by sign only
which could have been created by any of 3 species: long-tailed vole, montane vole, western
heather vole.) were detected at Thomas / Marolt during the 2019 surveys (golden-mantled
ground squirrel [Callospermophilus lateralis], least chipmunk [Tamius minimus], northern
pocket gopher [Thomomys talpoides], red squirrel [Tamiasciurus hudsonicus], and vole
[Microtus spp.] species), only the arboreal red squirrel is active in winter but none were detected.
There were no direct or indirect observations of American black bears (Ursus americanus), coyotes
(Canis latrans), red foxes (Vulpes vulpes), or Wyoming ground squirrels (Spermophilus elegans) in
2019.
Herpetofauna sampling has not been conducted at Thomas / Marolt OS but one reptile, a
western terrestrial garter snake (Thamnophis elegans) was detected in 2019. In addition, two
amphibian species likely occur at Thomas / Marolt. Although appropriate habitat for boreal
chorus frogs (Pseudacris maculata) and tiger salamanders (Ambystoma tigrinum) occurs on
Thomas / Marolt, but their presence has not been confirmed and no amphibian habitat occurs
within the project area.
RARE, THREATENED & ENDANGERED SPECIES
On March 21, 2024, the property boundary was submitted to USFWS via the IPaC system
(http://ecos.fws.gov/ipac/) requesting an official list of threatened, endangered, or candidate
species that may occur on or within proximity of Thomas / Marolt or may be affected by
Photo 3. Saskatoon serviceberry and Gambel oak dominate montane shrublands occupy most of the project area
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TECHNICAL MEMORANDUM
Wildlife Assessment ̶ Aspen Skills Trails Proposal
March 21, 2024
Page 4
implementation of the proposal. No federally protected species are expected to occur on
Thomas / Marolt or, more specifically, the project area. No designated critical habitat exists for
any listed species within or adjacent to the property. In addition, the State of Colorado list of
endangered and threatened species was reviewed and no state endangered species, threatened
species, or Species of Greatest Conservation Concern are known or suspected to occur on the
property.
DISCUSSION & MANAGEMENT IMPLICATIONS
Our 2019 and 2024 field surveys found that although Thomas / Marolt is heavily used by people
it is still used by wildlife that tend to more human-adapted. In other words, species such as
American robins, chickadees, coyotes, magpies, rabbits, and small mammals have
demonstrated an adaptability to
persist despite human activity
and alteration of native habitat.
Additionally, both elk and mule
deer continue to use the
property in limited numbers and
manner. The property is also
likely used by raptors such as
red-tailed hawks, great-horned
owls, northern pygmy owls, and
saw-whet owls who prey on the
abundant small mammals at
Thomas / Marolt.
The project area, however, is a very small patch (< 6 ac) of native montane shrubland dominated
by Saskatoon serviceberry (Amalanchier alnifolia) and Gambel oak (Quercus gambelii). Given
the landscape in which the project area is embedded, however, with Meadowood and the Aspen
Valley Hospital and Pitkin County Senior Services complexes to the west, and Marolt Place to
the east, the project area is quite isolated with very limited value for wildlife movement.
Development of the proposed skills trails within the project area will result in the direct loss of a
small area of a native plant community with minimal value for wildlife and is unlikely to cause
any indirect loss of valuable habitat.
LITERATURE CITED
Colorado Wildlife Science LLC (CWS), and Peak Ecological Services LLC (PES). 2019. Vegetation & Wildlife Baseline
Report: 2019 Growing Season. Prepared for City of Aspen Parks & Open Space Department, Basalt, CO.
Photo 4. The AVH and Senior Center complexes are substantial barriers to wildlife
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TECHNICAL MEMORANDUM
Wildlife Assessment ̶ Aspen Skills Trails Proposal
March 21, 2024
Page 5
BACKGROUND & QUALIFICATIONS
Colorado Wildlife Science, LLC (CWS) is a small wildlife and ecological consulting firm based in Basalt,
Colorado, specializing in wildlife research, management, and monitoring, ecological assessments,
wildfire hazard assessments, baseline inventories, ecological planning, habitat management, and
ecological restoration. CWS applies a scientifically sound approach to biological resource studies and
management. Our work combines professional integrity and strong academic training with extensive
experience working for government, private, and non-profit clients. With an extensive network of
professional collaborators that includes plant ecologists, foresters, hydrologists, and soil scientists,
CWS leverages the collective knowledge of experienced professionals working toward practical,
effective and cost saving solutions.
CWS provides expert services to a diverse array of clients. Since we are a small company, personal
attention is ensured. We combine full in-house GIS (ArcGIS) with real-time, sub-meter GPS to provide
state-of-the-art spatial data, analyses, maps, and presentations. Owner and Wildlife Biologist
Jonathan Lowsky, M.S. Wildlife Biology, Colorado State University, has a broad range of knowledge.
With more than 26 years of professional experience with federal (US Forest Service), state (Colorado
Division of Wildlife), and county agencies as well as two major universities (Colorado State University
and University of Washington), Jonathan’s career has focused on a diverse array of wildlife. Mr.
Lowsky’s experience includes biological assessments and evaluations for NEPA compliance,
conservation planning, GIS mapping and modeling, wildlife research, and ecological monitoring
design and implementation, as well as wetland and riparian delineations, evaluations, and
restoration. He has authored management plans and conservation easement baseline inventory
reports and published scientific papers.
Jonathan has been directly involved in fire mitigation since 1995 when he directed ponderosa pine
fuel reduction, thinning, and habitat improvement efforts on the North Kaibab Ranger District of the
Kaibab National Forest. Over the course of 26 years as a professional ecologist he has gained intimate
knowledge of ecosystem processes in western Colorado that lead to increased fuel loads, over-
mature forest and shrublands, and measures that can be taken to reduce the threat and intensity of
wildfires. In addition, I am experienced in mechanical treatments of forest, woodland, and shrubland
for the purpose of wildfire mitigation and habitat improvement. Mr. Lowsky strongly believes that
these two resource goals are mutually beneficial and measures that prioritize either wildfire
mitigation or habitat improvement should consider both goals in the design and implementation of
those actions.
In addition, Mr. Lowsky is a certified wildland fire mitigation expert and has completed two wildland
fire mitigation certification courses: (1) Wildland Fire Assessment Program and (2) National Fire
Protection Association (NFPA) FIREWISE - Conducting an Assessment in the Wildland/Urban
Interface.
A detailed description of Mr. Lowsky’s professional experience and references are available. For
additional information, please visit our website at www.coloradowildlifescience.com.
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ASPEN, COLORADO DATE: MARCH 21ST 2024
ASPEN BIKE SKILLS TRAILS
DESIGN DEVELOPMENT PROPOSAL
+
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TABLE OF CONTENTS
ASPEN BIKE SKILLS TRAILS
Design Development Proposal
Aspen, Colorado
PROJECT INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-5
WHO WE ARE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-7
SITE FINDINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-9
ILLUSTRATIVE PLAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-11
TRAIL DESCRIPTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . .12-29
CAD PLAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30-31
ESTIMATE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32-33
SUMMARY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34-35
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5
PROJECT INTRODUCTION
WE CREATE MORE THAN JUST TRAILS .
At Progressive Trail Design, we are excited to collaborate with you on
this project to develop exceptional trails that provide a thrilling and
memorable experience.
Our team is dedicated to designing and constructing high-quality soft
surface trails that blend seamlessly with the natural surroundings of
your property. We are committed to preserving the environment and
minimizing any negative impact on the landscape. Our goal is to create
sustainable trails that can be enjoyed for years to come.
Being trail users ourselves, we are confident in our ability to bring new
and exciting features to your community and property. We strive to
create a unique and challenging experience that caters to users of all
abilities and skill levels. Our desire is to listen well and work closely
with your team to ensure that the trails and amenities meet the needs
and expectations of your guests.
We are excited to be a part of this project and look forward to
collaborating with you to bring this vision to life. Let us help design
thoughtful trail access that encourages the community to explore the
beauty that surrounds your project.
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6 7
WHO WE ARE
Progressive Trail Design is a Design-Build firm that creates outdoor
recreational experiences and specializes in world-class mountain bike
trails. Born in the Ozarks, we are a rider-owned company that built the
Land of Oz--a mountain bike mecca in Bentonville, AR. We are now
designing and building trails worldwide.
Our passion for the outdoors drives us in creating dynamic experiences
that connect people with their environment. We push the limits of
artistic expression by transforming the elements of nature into an
active adventure.
Our approach is simple: Design-Build-Ride. Through an integrated
approach combining experience, skill, and expertise we have developed
a proven process that moves your vision into a reality.
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SITE FINDINGS
ASPEN BIKE SKILLS TRAILS
THE SITE:From what we gathered on our site visit, this space is currently
underutilized and has a lot of potential to be a community space. Given
that this area is tucked away into the hillside, it would allow trails to
blend seamlessly into the existing landscape. We want to be sensitive
and constructive to the natural landscape, creating a trail system that
blends the natural environment with biking space for the community.
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BIKE SKILLS TRAILS
ILLUSTRATIVE PLAN
N
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RETURN TRAIL
ASPEN BIKE SKILLS TRAILS
The return trail serves as the main connection to the top of the skills area. The trail is multi-use and can be
utilized as a pass through trail for all people on foot or bike. The surface will be natural material, smooth,
roughly 3’-4’ wide, and have a mellow slope for safe travel uphill or down.
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BEGINNER FLOW TRAIL
ASPEN BIKE SKILLS TRAILS
This beginner flow is designed to offer riders of all abilities to experience a roller coaster like downhill
experience. The aim of this trail is to provide a starting point for a rider wanting to progress and build upon
their skills. While beginners are the focus, Adaptive riders and advanced riders can have fun on this well
designed trail. Groups of people that vary in ability will session this trail over and over. This trail surface
will be natural and smooth with a width of about 4 feet.
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BEGINNER+ FLOW TRAIL
ASPEN BIKE SKILLS TRAILS
The beginner + trail builds upon the skills learned on the beginner trail with more trail features. Users can
expect to ride jumps, rollers and berms that are appropriately sized to be a challenge while maintaining the
ability to roll over everything. Advanced riders will find gap opportunities if they ride this trail at a higher
speed. Same as the beginner trail, the surface will be natural, smooth and have a width of 4 feet.
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18 19
INTERMEDIATE DH TRAIL
ASPEN BIKE SKILLS TRAILS
Adding to the scale of the skills trails the intermediate downhill trail will have larger jumps and features
although everything will still be rollable or have a ride line around any technical feature. Skills trails are
designed to be progressive and offer a challenge. Intermediate trails typically get ridden the most due to the
wide variety of riders they serve and we envision this trail to be highly rated as it will be both challenging and
fun. Surfacing for this trail will be natural, smooth and about 5-6 feet wide.
The Intermediate flyover is a concept that mimics the line of Red Mountain in the background and provides
passage for the Beginner + trail underneath. In order to make the most of the terrain on this site this flyover
allows for 3 dynamic trails instead of two. The feature will be constructed of cedar timber. Steel is an optional
for this feature but will increase the cost substantially.
Intermediate Flyover
PLAN
SIDE ELEVATION
FRONT ELEVATION
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Expert Flyover
PLAN
SIDE ELEVATION
FRONT ELEVATION
ADVANCED OPTIONAL ROUTE
ASPEN BIKE SKILLS TRAILS
Every site has unique features and terrain anomalies that create opportunities for memorable experiences.
A dip in the terrain between the beginner and intermediate flow trails provides an optional opportunity for
the expert flyover feature that is both a drop and a flyover of the beginner downhill trail. Riders on the in-
termediate trail can navigate to the optional expert flyover / drop to fly of the end of this advanced feature.
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TECH CLIMB TRAIL
ASPEN BIKE SKILLS TRAILS
The tech climb trail is intended to be a challenge climb and the most direct route up or down from the hub and
connecting to the paved trail below. This trail will be natural surface with roots, rock gardens, and will evolve
over time. Many riders will want to climb this as there will be bragging rights for being able to pedal up without
stopping to put down their feet.
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STRIDER TRACK
ASPEN BIKE SKILLS TRAILS
This strider bike track is built into the natural beauty of the landscape, where young adventurers can pedal,
balance, and explore in a safe and immersive environment. Crafted with natural materials and incorporating
simple features, this track will provide gentle slopes, winding paths, and natural obstacles for kids to enjoy.
Safety is paramount, with clear sightliness ensuring a worry-free riding experience for children of all skill levels
while staying within line of sight for their care giver. The track will be natural surface, about 3-4 feet wide and
will be appropriate for riders of all abilities.
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DROP ZONE
ASPEN BIKE SKILLS TRAILS
Designed to challenge the way riders have traditionally been taught to approach drop zones, they offer a
groundbreaking approach to building muscle memory and mastering the art of dropping. Unlike traditional
drop zones that feature singular drops of varying heights, our innovative design features incrementally
progressive lines with multiple drops on each, challenging riders to drop, reset, and drop again in rapid
succession. This unique setup is strategically crafted to facilitate a progressive learning experience, allowing
riders to build confidence and skill through successive attempts that challenge and refine their technique
with each drop. By forcing riders to confront a series of drops at different heights and angles, the Drop Zone
encourages riders to adapt and evolve their approach, ultimately enhancing their ability to tackle drops of
all sizes and complexities on the trail.
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RETURN TRAIL
BEGINNER FLOW TRAIL
INTERMEDIATE JUMP TRAIL
BEGINNER+ JUMP TRAIL
INTERMEDIATE DROP OPTION
EXPERT OPTION
PROGRESSIVE DROP ZONE
CLIMB TRAIL
(FROM MAROLT PL.)
START HUB
TRAILHEAD
PARKING
TOTS TRACK
BIKE PATH
CONNECTOR
POTENTIAL BRIDGE
NEEDED
CONNECTOR TRAIL
PROGRESSIVE TRAIL DESIGN
410 SW. A Street #4
BENTONVILLE, AR 72712
(479)-364-0012
EMAIL: info@progressivetraildesign.com
www.progressivetraildesign.com
REVIEW SET1
REVISION / ISSUENo.DATEAspen Skills TrailsAspen, ColoradoAspen Skills
TrailsDRAFT
NOT FOR CONSTRUCTIONCAD PLAN
ASPEN BIKE SKILLS TRAILS
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30 31
OPINION OF PROBABLE COST
ASPEN SKILLS PARK (PTD)GRAND TOTAL:$561,510.50
1 RETURN TRAIL $17,572.00
1.1 Contour Flow Trail Construction LF $10.00 978 $9,780.00
1.2 Turn Construction EA $800.00 0 $0.00
1.3 Culverts (Stone Wrapped)EA $1,500.00 2 $3,000.00
1.4 Stone Features Allowance (armoring & walls)SF $50.00 50 $2,500.00
1.5 Mobilization (5-10%, depending on location)PER 15%15280 $2,292.00
2 BEGINNER FLOW TRAIL $90,969.60
2.1 Beg. DH Flow Trail Construction (w/backditch)LF $20.00 922 $18,440.00
2.2 Turn Construction EA $1,500.00 11 $16,500.00
2.3 Jumps (2-3'H)EA $600.00 6 $3,600.00
2.4 Stone "Jump Lips" Allowance (Est. 48sq'/lip)SF $65.00 288 $18,720.00
2.5 Stone Features Allowance (armoring & walls)SF $50.00 200 $10,000.00
2.6 Culverts (Stone Wrapped)EA $2,000.00 5 $10,000.00
2.7 E&S, Rip-Rap, & Rehab LF $2.00 922 $1,844.00
2.8 Mobilization (5-10%, depending on location)PER 15%79104 $11,865.60
3 BEGINNER + FLOW TRAIL $81,165.85
3.1 Beg. DH Flow Trail Construction LF $15.00 987 $14,805.00
3.2 Turn Construction EA $1,500.00 2 $3,000.00
3.3 Jumps (3-4'H)EA $800.00 10 $8,000.00
3.4 Stone "Jump Lips" Allowance (Est. 52sq'/lip)SF $65.00 520 $33,800.00
3.5 Stone Features Allowance (armoring & walls)SF $50.00 100 $5,000.00
3.6 Culverts (Stone Wrapped)EA $2,000.00 2 $4,000.00
3.7 E&S, Rip-Rap, & Rehab LF $2.00 987 $1,974.00
3.8 Mobilization (5-10%, depending on location)PER 15%70579 $10,586.85
4 INTERMEDIATE DH TRAIL $103,732.30
4.1 Int. DH Flow Trail Construction LF $20.00 941 $18,820.00
4.2 Turn Construction EA $1,500.00 1 $1,500.00
4.3 Jumps (4-5'H)EA $1,000.00 10 $10,000.00
4.4 Stone "Jump Lips" Allowance (Est. 60sq'/lip)SF $65.00 600 $39,000.00
4.5 Stone Features Allowance (armoring & walls)SF $50.00 300 $15,000.00
4.6 Culverts (Stone Wrapped)EA $2,000.00 2 $4,000.00
4.7 E&S, Rip-Rap, & Rehab LF $2.00 941 $1,882.00
4.8 Mobilization (5-10%, depending on location)PER 15%90202 $13,530.30
5 TECH CLIMB TRAIL $37,472.75
5.1 Tech Singletrack Construction (Handcut)LF $15.00 505 $7,575.00
5.2 Turn Construction EA $1,000.00 4 $4,000.00
5.3 Stone Features Allowance (armoring & walls)SF $50.00 400 $20,000.00
5.4 E&S, Rip-Rap, & Rehab LF $2.00 505 $1,010.00
5.5 Mobilization (5-10%, depending on location)PER 15%32585 $4,887.75
6 STRIDER TRACK $34,500.00
6.1 Strider Course Construction LS $20,000.00 1 $20,000.00
6.2 Stone Features Allowance (armoring & walls)SF $50.00 100 $5,000.00
6.3 Culverts (Stone Wrapped)EA $2,000.00 2 $4,000.00
6.4 E&S, Rip-Rap, & Rehab LS $1,000.00 1 $1,000.00
6.5 Mobilization (5-10%, depending on location)PER 15%30000 $4,500.00
7 DROP ZONE $20,838.00
7.1 Beginner Line LF $20.00 70 $1,400.00
7.2 Beginner + Line LF $20.00 70 $1,400.00
7.3 Intermediate Line LF $20.00 70 $1,400.00
7.4 Turn Construction EA $1,500.00 1 $1,500.00
7.5 Stone Features Allowance (armoring & walls)SF $50.00 200 $10,000.00
7.6 Culverts (Stone Wrapped)EA $2,000.00 1 $2,000.00
7.7 E&S, Rip-Rap, & Rehab LF $2.00 210 $420.00
7.8 Mobilization (5-10%, depending on location)PER 15%18120 $2,718.00
8 BIKE FEATURES $146,510.00
8.1 Intermediate Fly-Over SF $200.00 222 $44,400.00
8.2 Alt. Exp. Drop Feature SF $200.00 240 $48,000.00
8.3 Alt. Exp. Drop Line (Trail Work)LS $10,000.00 1 $10,000.00
8.4 Start HUB (Dirt with Boulders around top)LS $25,000.00 1 $25,000.00
8.5 Mobilization (5-10%, depending on location)PER 15%127400 $19,110.00
9 STRUCTURE/OTHER $28,750.00
9.1 Landscape Allowance LS $5,000.00 1 $5,000.00
9.2 Trailhead Plaza Allowance LS $10,000.00 1 $10,000.00
9.3 Signage Allowance LS $10,000.00 1 $10,000.00
9.4 Mobilization (5-10%, depending on location)PER 15%25000 $3,750.00
Aspen Bike Skills Trails (OPC)
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Progressive Trail Design creates some of the most innovative trail recreation
destinations in the world. This well crafted plan and comprehensive approach
will deliver a balanced project- wide vision appealing to all users and skill levels.
We look forward to creating a fun and exciting trail system to be enjoyed for
generations to come. Thank you for your time.
SUMMARY
ASPEN BIKE SKILLS TRAILS
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PROGRESSIVE TRAIL DESIGN LLC 410 SW A ST . SUITE 4 B ENTONVILLE, AR 72712 INFO@PROGRESSIVETRAILDESIGN .COM 479 .364 .0012
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