South Pratt Parkway Bridge Replacement

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Over St. Vrain Creek

South Pratt Parkway Bridge viewed from the east
South Pratt Parkway Bridge west side teardown
west-side-girders-in-place on South Pratt Parkway Bridge

Project Overview


Design for the new bridge was completed during 2016. Utility relocation and tree removal began in 2017, and construction on the bridge replacement began in January 2018. Once underway, construction is anticipated to take between 9 months to one year to complete.


The South Pratt Parkway Bridge was built in the late 1970s and is approaching the end of its useful life. The bridge is too narrow for the traffic volumes that cross it daily, classifying it as “functionally obsolete” per the Colorado Department of Transportation's biannual bridge reports.

The bridge replacement is happening concurrently with the larger project known as Resilient St. Vrain—a large-scale and long-term effort to protect people and property of the Longmont community by improving the St. Vrain Creek corridor and making the channel more resilient to future flooding.

Recommended Improvements

Although the bridge is currently structurally adequate, upgrades such as expansion joint improvements and guard/bridge rail updates are needed. This bridge will be widened to safely carry traffic and to provide pedestrian/bike facilities along both sides of this collector roadway and connections to the St. Vrain Greenway trail. In addition, the new bridge will be designed to safely pass 100-year flood flows of the St. Vrain Creek, which the existing bridge does not do.

South Pratt Parkway Bridge illustration


This project is a multi-agency partnership between the City of Longmont, the Federal Emergency Management Agency (FEMA) and the Colorado Division of Homeland Security and Emergency Management (DHSEM).


Funding for this project comes from the City's 3/4-cent Street Fund sales and use tax, as well as from a FEMA pre-disaster mitigation grant. Cost for the bridge replacement project is projected to be $5 million.

Project Communication

News releases and status updates on the project will be shared on this page.

South Pratt Parkway Bridge replacement begins Jan. 15

Lane closures to begin Jan. 25 for bridge replacement

Pedestrian detour route

Pedestrian detour routes for South Pratt Parkway Bridge


Project Manager Allan Bryning, Sr. Civil Engineer

Please direct questions or comments about the project to or 303-219-7474. Responses can be expected within 24 hours.

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