Diagonal Highway Intersection Safety Improvements Coming This Fall

Planned Underpass at N. 63rd Street to be Built as an Overpass

Boulder County and the Colorado Department of Transportation (CDOT) are collaborating on changes to some intersections on the Diagonal Highway, CO 119, where high numbers of crashes have been recorded.

CDOT, which manages the identified intersections, collaborated with the county on possible changes and then brought the drafts to the public at an in-person public meeting on Dec. 13, 2023, in Niwot, and via short videos on the CDOT and County sites.

Visit these CDOT webpages to see the planned changes for each intersection:

The CO 119 Safety, Mobility and Bikeway Project will construct a nine-mile bikeway between Boulder and Longmont, bus rapid transit stations and bus bypass lanes for faster and more reliable buses and intersection safety improvements. Construction on the project will begin later this year.

Safety for all travelers and users of the Diagonal Highway corridor is the main reason for the planned improvements. This includes safety for people on bikes and safety for people in vehicles.

Construction on sections of CO 119 will be starting this fall. More information on exact locations of construction will be released soon.

For more information visit boco.org/119Bikeway, or contact Alexandra Phillips, Boulder County Bike Planner, at aphillips@bouldercounty.gov or 303-441-4520. 

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