Colorado Highway 52 will be temporarily closed to all traffic between Colorado Highway 119/Diagonal Highway and 71st Street

Boulder County, Colo. - Beginning at 5 a.m. on Wednesday, May 6, through 5 p.m. on Saturday, May 9, Colorado Highway 52 will be temporarily closed to all traffic between Colorado Highway 119/Diagonal Highway and 71st Street.

This closure is required to connect CO 52 to the realigned CO 119 and switch the signals and railroad crossing over to the new alignment as part of the CO 119 Safety, Mobility and Bikeway Improvements Project.

During the closure, motorists will be directed to follow signed detour routes. There will not be a separate signed detour for cyclists. Cyclists are encouraged to use an alternate route while the closure is in place.

Detour Routes

For alternate access, travelers should use US Highway 287 (via Ken Pratt Boulevard in Longmont or Colorado Highway 7 in Boulder) to detour around the closure.

Temporary Closure of CO 52 Between CO 119 and 71st Street detour map.

Work schedules are subject to change and can vary based on conditions. Subscribe to CO 119 Diagonal Highway Safety, Mobility and Bikeway Project Construction Updates from CDOT.

View the CDOT CO 119 Safety, Mobility & Bikeway Improvements Traffic Update for May 3 to 9.

View the CDOT CO 119 Safety, Mobility & Bikeway page for more information..

Project Contacts

• CDOT phone: 720-378-8083
• CDOT email: co119safetyandmobility@gmail.com
• Boulder County phone: 303-441-4520
• Boulder County email: aphillips@bouldercounty.gov

CO 119 Safety, Mobility and Bikeway Project Area Map.

Boulder County wants to ensure that everyone has equal access to our programs, activities, and services. To request an Americans with Disability Act (ADA) accommodation, please email ada@bouldercounty.gov, or call 303-441-1386. If you need help in another language, please email cppfrontdesk@bouldercounty.gov or call 303-441-3930.