Closures & Construction

Construction-Related Travel Impacts

Boulder County Public Works manages construction projects in unincorporated Boulder County for roads, bridges, multi-use pathways, and drainages.

Travel Impacts

County Road Projects

Sugarloaf Road Flood Recovery Project underway

Boulder County is currently working on the last 2013 flood recovery-related project on Sugarloaf Road. The project involves the construction of five retaining walls, drainage improvements, and reconstruction of approximately 2,000-feet of roadway just up from CO 119 and will include a four-foot shoulder in the uphill lane. During daytime, weekday working hours, expect up-to 20-minute delays on Sugarloaf Road as the road has been reduced to one lane. Flaggers will be used during the day to safely guide travelers. For afterhours traffic control, temporary traffic signals have been installed on Sugarloaf Road. In addition, CO 119/Boulder Canyon Drive will be reduced to one lane during working hours (8 a.m. to 4:30 p.m., Monday through Friday). Flaggers will be used to guide travelers on CO 119 during the lane closures. Residential cycling only (at all times) in the uphill direction on Sugarloaf Road. The project is anticipated to last into November, weather permitting. Learn more on the project webpage.

City of Boulder waterline project requires closures of Twin Lakes Road starting Nov. 7

A City of Boulder waterline project in Gunbarrel will require full closures of Twin Lakes Road in multiple locations starting Monday, Nov. 7. Work is expected to last two weeks. For more information, visit the city’s website or contact project manager Dan Kvasnicka via email or at 720-626-9080.

Thank you for your patience and understanding while we work to complete these projects.

For more information about Boulder County road travel impacts, please contact – Andrew Barth – 303-441-1032

Projects Impacting Cycling

Sugarloaf Road Construction – No uphill cycling between CO 119 and Betasso Road

Starting May 2, 2022, crews will begin constructing new retaining walls along the first 2,000-feet of Sugarloaf Road up from CO 119/Boulder Canyon. In order to complete this work, Sugarloaf will be reduced to one-lane in this stretch. Traffic signals will be used to control alternating traffic on the available lane. Due to the steep incline, cycling will not be allowed in the uphill direction through the construction zone Cycling will be allowed in the downhill direction. The project is anticipated to be completed in October 2022, weather permitting. Learn more.

Thank you for following restrictions! We apologize for any inconvenience.

Project Contact – Andrew Barth – 303-441-1032

Non-County Projects

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Boulder, CO 80304

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