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Union Reservoir Recreational Master Plan

Master Plan Environmental Survey

Reservoir Enlargement Study

Recreational Master Plan

Project History

Union Reservoir Trail

The next public workshop to review trail alternatives is scheduled for Thursday, December 6th from 6:00 - 7:30 p.m. at the Parks, Open Space & Public Facilities Building at 7 S. Sunset Street (across from Izaak Walton Park).

Click here for the meeting flyer for more information.

(November 1, 2012) Below are links to meeting notes and materials that were distributed at the Neighborhood Stakeholder Meeting on October 17, 2012 and the Public Workshop on October 18th. Thank you to all who attended and provided input!

Meeting Notes

Opportunities & Constraints Map

Goals & Objectives

Project Schedule



(October 10, 2012) The City has hired Alta Planning & Design out of Boulder to assist with developing trail alternatives and they would like to hear from you! Please join us for a Public Workshop on Thursday, October 18th from 6:30 – 8:00 p.m. at the Parks, Open Space & Public Facilities Building at 7 S. Sunset Street (across from Izaak Walton Park). The workshop is intended to gather input on opportunities, constraints, goals and objectives to guide the design of feasible trail alternatives that meet the needs and desires of the community and potential trail users. Additionally, Walsh Environmental Scientists & Engineers will be at the meeting to present findings from their recent environmental survey (link to the final report below). We hope to see you there!

2012 Union Reservoir Wetland Delineation & Special Species Status Report

Meeting Flyer English / Espanol

(May 24, 2012) On-site environmental surveys by Walsh Environmental will be occurring during the month of June. Surveys will include assessment of threatened and endangered plant and animal species, wetland delineations, and nesting habitat. A follow-up site visit will occur in late July/early August to survey the Ute ladies’-tresses orchid. You are invited to meet staff from Walsh Environmental on June 6, 2012 from 5:30 to 6:30 at the Union Reservoir Main Picnic Area to discuss the assessment. The time is set aside for local environmentalists, birders and enthusiasts to learn more about Walsh Environmental’s survey methods and to share knowledge. This is an informal gathering for those interested in the environmental assessment. There will not be a formal presentation or tour of sites, however staff from Walsh Environmental welcomes local observations to include in their overall assessment of the area.

(April 27, 2012) A public meeting was held on Tuesday, April 24th, 2012 to gather input on opportunities, constraints and potential issues that should be considered during the design of the trail project. Staff is incorporating the input in the scope of work for potential design consultants for the trail. The City intends to have a design consultant on board by early August.  Below is a summary of the meeting and DRAFT timeline for the project.

If you have any questions regarding the Interim Trail Project, please contact Kathy Kron, Project Manager at (720) 774-4528 or via e-mail at

4/24/12 Meeting Summary

DRAFT Project Timeline – Design

DRAFT Project Timeline – Construction

Union Reservoir Recreational Master Plan

A recreational master plan study began in 2007 but was never adopted. Conditions changed at and around the reservoir including City purchase of lands on the western side of the reservoir. Public meetings were held in 2011 and was adopted by City Council on February 14, 2012. Link to Union Reservoir Master Plan Report

Union Reservoir is a 745 acre body of water providing many outdoor recreational activities. Originally called Calkins Lake, the reservoir was carved out during the last glacial age and is one of only a few natural lakes in Colorado. In 1903, the Union Ditch Company began drilling a tunnel to release water into the St Vrain River. According to Colorado water law, that made Union a true reservoir. Today, visitors to Union Reservoir can enjoy fishing, swimming, wakeless boating, camping, windsurfing and picnicking. The Reservoir is located approximately 7 miles west of I-25. For additional information, call Ranger staff at (303)772-1265.


Union Reservoir Recreational Master Plan Approval

Union Reservoir Recreational Master PlanCity Council approved the Recreational Master Plan at their February 14, 2012 meeting. Approval included the requirement to continue to meet with neighbors to discuss the design of the planned loop trail, bring that design back to the Parks and Recreation Advisory Board and to City Council prior to detailed design.

Meetings with neighbors are currently planned or underway. If you are interested in participating in the design of the loop trail, contact Paula Fitzgerald (information on left side of this web page).

2011 Recreational Master Plan - Overall plan


Project Information

Changed Conditions

Since the time of the 2007 Draft Recreational Master Plan many conditions have changed including:

Master Plan Environmental Survey

Walsh Environmental Consulting updated the previous environmental work that was utilized for the 2007 Master Plan.  Highlights of the new report include:

Link to full

Enlace a information complete Natural Resources and Habitat assessment update (english)

Natural Resources and Habitat Assessment Update

Reservoir Enlargement Study

The Union Reservoir Enlargement Study is a separate project but the future shoreline is reflected in the Recreational Master Plan. This study estimates an increased surface area of the reservoir by approximately 26% - 33% depending on final configuration of the enlargement. More information on the Enlargement Study can be found here:

Link to Union Reservoir Enlargement Study


Recreational Master Plan

The Union Reservoir Recreational Master Plan is adopted. To view the plans click the links below:

2011 Overall Plan

2011 Southwest Plan

2011 East Plan

Previous Work

Project History

The City of Longmont Natural Resources Division began the Union Reservoir Master Plan project in 2007 with a large amount of public input.  Highlights of the Reservoir history include:


For additional information, please call Paula Fitzgerald, 303-651-8448 or email