This project will reconstruct the Central Avenue bridge over Dry Ditch #2 and the existing pedestrian bridge east of 55th Street in Flatiron Park.

  1. Build

    Fall 2025 - Winter 2026

  2. Complete

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Current Phase
Build

Project Overview

Project improvements focus on:

  • Replacement of the existing bridge structure, which is now in poor condition.
  • Repaving of Central Avenue over the new structure and new roadway striping.
  • Removal of the existing pedestrian bridge and construction of a sidewalk adjacent to the roadway, over the bridge structure.
  • Reducing the posted speed limit to 25 mph on Central Avenue.
  • Public art.
  • New waterline and storm sewer.

Timeline

Construction will begin in September 2025, and substantial work is anticipated to be complete in December 2025. We anticipate completing remaining work in winter of 2026.

Construction Impacts

Once construction starts and through the end of 2025, Central Avenue will be fully closed to all eastbound and westbound travel between 5541 and 5600 Central Avenue. A detour route will be in place for people driving, walking and biking via 55th Street and Flatiron Parkway. See map below for more details or view Cone Zones for updates.

Central Avenue Bridge construction detour; details beneath Construction Impacts header on project webpage

Funding

The project budget is $5 million, funded by the Community, Culture, Resilience, & Safety (CCRS) Tax to support a safe, sustainable, accessible and connected multimodal transportation system that connects people with each other and where they want to go.

Related Projects

The City of Boulder’s 1% for Public Art Policy will fund a public art project following the completion of the Central Avenue Bridge.