Izaak Walton Reach 2 - City of Longmont Skip to main content

Izaak Walton Reach 2

A calm and narrow creek winding through a dirt-covered landscape with a cement path in the lower left corner.

Project Overview

Izaak Walton Reach 2 is part of the Resilient St. Vrain Project to restore the St. Vrain Greenway trail and improve the St. Vrain Creek channel to protect people, property and infrastructure from future flood risk. Longmont entered into a Public Partnership Agreement with the U.S. Army Corps of Engineers for the design and construction in 2016. Design was completed in December 2022. This project includes channel improvements between Boston Avenue and Sunset Street. The replacement of the Boston Ave Bridge is considered part of this reach and was funded by the City as a local agency match.

Project Status

Updated: July 21, 2026
This project started construction in March 2025 and is scheduled to be completed in August 2026

  • On June 16 the Greenway Trail between Boston Ave and Sunset St will be closed and remain closed until the project is complete.
  • Download a copy of the trail detour map.
  • Access to Izaak Walton Park, Clubhouse, and pond will be available, but temporary closures will be required.

 

Construction of the St. Vrain channel and Greenway Trail will be completed in August 2026. The trail will be reopened to bicycles and pedestrians. Landscaping within the construction area will be delayed until fall 2026 to avoid planting during undesirably hot weather. The Greenway Trail will likely be closed for a short time to enable revegetation efforts.

 

Goals & Planned Improvements

The Izaak Walton Reach 2 project will increase the channel capacity to safely contain 100-year flood water levels. Once work is completed in this reach, the floodplain to the north of the St. Vrain Creek will be mitigated, protecting lower downtown from future flood risk. The Greenway Trail will be reestablished as be a 10-ft wide concrete path with a 3-ft wide gravel shoulder.

 

This illustration shows the future Izaak Walton Pond and St. Vrain Creek overlaid on top of the same area before construction began.

This illustration shows the future Izaak Walton Pond and St. Vrain Creek overlaid on top of the same area before construction began.

 

Project Schedule

Construction started in March 2025. The project is expected to take 18 months and is scheduled to be completed in August 2026.

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