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Fourmile Canyon Creek Greenways Improvements Project

Fourmile Canyon Creek Greenways Improvements Project

The city is planning improvements along Fourmile Canyon Creek to increase safety and accessibility to Crest View Elementary School by completing improvements at Broadway and at 19th Street.

This project includes creek channel improvements, upgrading the current culvert and underpass at Broadway, and the replacement of a structurally deficient bridge at 19th Street with a bicycle/pedestrian underpass that can also serve a flood benefit. The project provides a safer access to Crest View Elementary School for pedestrians and bicyclists.

Project Schedule and Next Steps 

Preliminary design is currently underway, and final design is anticipated to be completed by the end of 2020, with a 2-year construction period to follow. Funding for transportation components of the project will come from the 2017 Community, Culture and Safety Tax extension. 

Broadway Underpass Improvements

As part of the North Broadway (Violet to US 36) Reconstruction project, the city will be adding elements to the underpass at Fourmile Canyon Creek to provide future flood capabilities to convey flows associated with a 50-year flood event. However, the additional capacity will not be fully realized until improvements to the creek are constructed downstream. Until the downstream improvements are constructed, the new underpass at Broadway will require a flow restriction device to be installed to mimic current flood conditions. Details on how the flow restriction will be accomplished are pending hydraulic design.

Fourmile Canyon Creek at Broadway Improvement Rendering pdf

19th Street Underpass Design

The Greenways Project on Fourmile Canyon Creek and 19th Street is intended to improve flood conveyance as well as safety and accessibility to Crest View Elementary School. A Community and Environmental Assessment Process (CEAP) for Fourmile Canyon Creek east of 19th Street was completed in March 2012 and the city has hired a consultant to complete a design for the improvements for this area.

Underpass Design Figure pdf

West of 19th Street Path and Flood Mitigation Alternatives Analysis

The City completed a Community and Environmental Assessment exploring flood mitigation and trail options for the upstream reach from Upland Avenue through Violet Park to the west of town. The purpose of the CEAP process was to evaluate the various alternatives available. 

 Final CEAP Upland to Broadway pdf

Upcoming Meetings

There are currently no upcoming meetings regarding flood improvements to Fourmile Canyon Creek. 

Previous Meetings

June 6, 2019 - North Broadway (Violet to US36) Reconstruction Project Open House at Crest View Elementary

  • City staff and consultants were on hand to answer questions about the project. 
  • One of the stations at the open house featured information on the improvements to Fourmile Canyon Creek at Broadway as part of the overall project design. 

May 22, 2016 - North Boulder Public Works Open House

Nov. 18, 2015 - Open House at Crest View Elementary to present:

  • Updated information on the design for the multi-use path and underpass between 19th and Tamarack Street,
  • Path Connector Alternatives and seek community feedback, and
  • CEAP alternatives for the area west of 19th Street and seek community feedback.

Sept. 26, 2013 - Fourmile Canyon Creek Open House

This open house was originally scheduled before the September 2013 flood as part of a CEAP to evaluate flood mitigation, path connection, and park development options for the area along Fourmile Canyon Creek between Upland Avenue and Violet Park.

City staff expanded the purpose of this open house to provide an opportunity for the community to discuss the impacts of the recent flooding, see the flood damage information that had been collected, and provide comments about future improvements. This was also an opportunity for residents to speak with city staff to get information and assistance with flood recovery. Development options for Violet Park will be presented at a future meeting.

Feb. 15, 2012 - GAC Meeting

The Fourmile Canyon Creek 19 th - 22 nd Streets CEAP was discussed and reviewed by the Greenways Advisory Committee (GAC) at their meeting on Feb. 15, 2012.

Oct. 26, 2011 - Open House

The public was invited to provide input on:

  • Pedestrian, bicycle and vehicular access connections in the area between 22 nd Street and Crest View Elementary School and Upland and Riverside Avenues; and
  • Flood mitigation improvements at 19 th Street and Fourmile Canyon Creek.

Public input received at the May 2011 Open House helped develop several alternatives for consideration. City staff presented updated information on the alternatives, concept-level costs, and potential impacts and benefits of the alternatives.

May 11, 2011 - Open House Presentation

A public Open House was held on May 11, 2011 to kick off the CEAP and obtain community input on potential access options. Proposed pedestrian, bicycle and vehicular access connections as shown in the Transportation Master Plan, Greenways Master Plan and North Boulder Subcommunity Plan were available for review and comments. Information about proposed flood improvements at 19 th Street and Fourmile Canyon Creek was also available.



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