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Bridge Maintenance Projects

Boulder’s transportation division is responsible for transportation infrastructure maintenance including major capital maintenance improvements to the roadway, bikeway, and pedestrian system. There are several programs focused on capital transportation maintenance.

Upcoming Projects for 2019 - 2020 

15th Street Bridge Replacement

The 15th Street Bridge, located between Canyon and Arapahoe at Left Hand Ditch, has exceeded its lifespan and is in need of replacement. In expectation of upcoming development, the project team begin implementation of a future east-west multi-use path connection, as outlined in the 2019 Transportation Master Plan. In addition, sidewalk improvements on the east side of 15th Street in the vicinity of the bridge will be implemented. Staff will work with adjacent property owners to rehabilitate the natural areas in proximity to the project. Pre-construction work in Fall 2019 included tree removals and utility line relocations. Risk assessment factors and the trees' proximity to the construction site compounded the need for removal.

Bridge Construction: November 9, 2020 through Spring 2021
View the City Press Release

15th Street between Canyon and Arapahoe will be fully closed from November 30 - December 23 (weather-dependent). Vehicles, bicyclists and pedestrians will be asked to detour to 14th Street during this time. Construction flaggers will direct roadway users. Businesses should be accessed via Canyon, Arapahoe, 14th or Grove. Visit  for up-to-date information on construction and travel impacts. 

Major Capital Reconstruction

In 2015, a Major Capital Reconstruction Program budget was added using new transportation funds (approved in the 2013 ballot item) targeted to repair or reconstruct major assets. Prior to this program budget, repairs were made primarily through individual capital improvements program budgets and the multi-use path maintenance budget. 

The Colorado Department of Transportation (CDOT) places structures in two categories, Major and Minor. Major structures (greater than 20’ span) are inspected by CDOT every two years. Minor structures (4’-20’ span) are inspected by the City every four to five years. A comprehensive analysis of Boulder’s Major and Minor structures inventory is continually performed. This provides a basis for directing program resources to higher priority capital maintenance needs.

Currently, the program budget focuses on addressing maintenance needs for bridges and culvert/pipe crossings, which facilitate vehicle, bicycle and pedestrian crossings. Project types vary from repair to replacement to rehabilitation. This proactive measure is in line with the transportation budget priority of keeping the city’s infrastructure functioning in good condition.

Previously Completed Projects

Riverside and Wonderland Creek Pipe Lining, Fall 2019
The city recently rehabilitated a 60-inch corrugated metal pipe (CMP) culvert crossing by applying a concrete liner and performing some minor channel improvements. 

Gregory Canyon Creek Culvert Replacement, Summer 2017 
A collapsed culvert which threatened to erode the alley driving surface and cause upstream flooding along the creek was safely restored.

Cured-in-Place Polymer Pipe Lining, Summer 2017
The city rehabilitated several corrugated metal pipe culvert crossings by retrofitting them with a polymer vinyl. Due to trench less technology, city staff were able to perform several projects in a short time with minimal disruption to traffic operations. 

10th Street and Pennsylvania Avenue Culvert Reconstruction, Spring 2017 
Road surface settling at this location led to efforts to reconstruct the culvert. 

Alley Bridge Re-decking, Summer 2016
A deteriorating timber bridge deck with failing abutements was replaced with a concrete deck and abutments between Mapleton Avenue and Pine Street.

Related Photos

15th street bridge replacementRiverside and Wonderland Creek Pipe Lining, Fall 2019Alley Bridge Re-Decking, Summer 201610th Street and Pennsylvania Avenue Culvert Reconstruction, Spring 2017Gregory Canyon Creek Culvert Replacement, Summer 2017Cured-in-place polymer pipe lining, Summer 2017

See full photo set in the Photo Gallery

More information 

For more information contact Jenny Godwin, Associate Planner for Transportation and Community Engagement at 303-441-4934 or [email protected]