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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. Temporary traffic signals will be installed on Sugarloaf Road as the road will be reduced to one-lane in the construction zone. 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. The project is anticipated to last into October, weather permitting. Learn more on the project webpage.

Olde Stage Road resurfacing project starts in July

Boulder County Public Works and Asphalt Specialties will work on resurfacing Olde Stage Road between Lefthand Canyon Drive and Lee Hill Drive starting in early July. Work will include creation of a 4-foot uphill shoulder on the south side of Olde Stage Road to provide more room for cyclists and pedestrians. Learn more about that project.

South Boulder Road Emergency Concrete Panel Replacement – Project on hold to date to be determined

Failing concrete panels will be replaced on South Boulder Road between Manhattan Drive and Cherryvale Road starting at a date to be determined. This work will require lane closures in both directions on South Boulder Road and a pedestrian/cyclist detour due to a shoulder closure (see map). The work is anticipated to take two weeks, weather permitting. Expect delays during the entire project due to South Boulder Road being reduced to one-lane in each direction. Learn more.

Chip Seal Roadwork starts June 7

Boulder County Road Maintenance will start annual chip seal operations on Tuesday, June 7. Work will take place from 7 a.m. to 4 p.m., Monday through Friday and the project is anticipated to last into July. Work will take place on nine stretches of roadway in the following order:

  • 119th Street from Oxford Road to the county line
  • 115th Street from Oxford Road to Niwot Road and on to East County Line Road
  • Isabelle Road from 95th Street to US 287
  • Valmont Road from 75th to 95th street
  • Jay Road from 63rd to 75th street
  • Lookout Road from 75th street to US 287
  • Somerset and Longview Road in Niwot
  • 73rd/75th Streets from Niwot Road to CO Highway 66
  • N. 1115th from CO Highway 66 to Yellowstone Road
  • See map

Work will require lane closures and reduced speeds. Cyclists may want to avoid these roads until the roads are sealed and final sweeping can take place. Learn more about why annual chip seal operations are important for the lifespan of county roads and how the county uses a smaller chip to help make the new surface smoother for cycling.

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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2525 13th Street
Boulder, CO 80304

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P.O. Box 471
Boulder, CO 80306