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Sunday, April 14, 2024

Workers start building 19th Street underpass in Boulder

Workers have started building an underpass that will run under 19th Street along Fourmile Canyon Creek in north Boulder. The planned work will help enhance travel and flood mitigation in the area.

The new underpass will allow bicyclists, pedestrians and other travelers to pass between Tamarack and Upland avenues. City workers also will make other improvements, such as replacing and widening the 19th Street bridge over the creek, creating a new buffered bike lane and building a new sidewalk.

The 19th Street underpass is one of a series of underpasses the city has planned to add over the past several years. This project passed through a community and environmental assessment and received funding from Boulder’s Utilities Department Stormwater Fund, the Community, Culture, Resilience and Safety Tax, and the Mile High Flood District. The Daily Camera asked city officials about the specific cost of the underpass project, but did not receive an answer in time for publication.

Workers are doing preparatory work for the construction, which is expected to start Monday and last for about two years. There will be long-term traffic impacts in the area for the duration of the project.

Travelers should anticipate traffic delays in some areas between Sumac and Upland avenues. Flaggers will direct traffic in areas where work has started. But effective Monday, there will be long-term lane closures on 19th Street between Sumac and Upland avenues.

The northbound lane will close starting Monday, and the northbound and southbound lanes will be closed from 8 a.m. on March 29 through 5 p.m. on March 30. After that time, the city plans to reopen the southbound lane, but the northbound lane will stay closed for the remainder of the construction period.

The underpass is the first of two planned projects along 19th Street. The second is slated to start this summer and will add further transportation enhancements. Detours and traffic impacts will be announced later this year.

Motorists, bicyclists, pedestrians and transit users can view a project detour map at bouldercolorado.gov/media/14049. The most up-to-date information on traffic impacts is available at bldr.fyi/ConeZones. More details on the 19th Street projects can be found at bldr.fyi/19th-street.

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