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Closures & Construction

Construction-Related Travel Impacts

Boulder County Transportation manages the construction projects for roads, bridges, pathways, drainage improvements and trails. The projects listed on this page are related to flood recovery and regularly scheduled roadway maintenance.

Travel Impacts

County Road Projects

Twin Lakes Trail Connections Project area map

Williams Fork Trail Multi-Use Path Enhancements and Twin Lakes Road Concrete Replacement

  • Twin Lakes Road CLOSED at Brandon Creek Drive starting Monday, March 16
    • Road is too tight to complete concrete roadway panel replacement without closure
    • This alignment will be in place at this location for two weeks (24 hours a day, seven days a week)
      • Additional detours may be needed to finish the roadway portion of the project
    • Detour signage will be posted.
  • Work hours = 8 a.m. to 4:30 p.m. — January through May
  • Project website
Road Closed sign

N. 61st/N. 63rd Street CLOSED between Hygiene Road and CO 66

Starting Monday, Jan. 20, N. 61st St. and N. 63rd St. between Hwy 66 and Hygiene Rd. will be closed to through traffic. Specifically, the closure will be just south of the bridge over St. Vrain Creek on 61st St. All residents on 61st and 63rd streets will have access to their driveways and properties. The closure will be in place for approximately two months. The work is being completed by Boulder County Parks and Open Space. Project website.

Damaged creek bed with bits of the road in the water.

Airport Road/Diagonal Highway – Turning lane closures from Airport onto Diagonal

Road Maintenance is completing a flood protection project on the bridge abutments. They are armoring the concrete to protect against scour from high/fast water, which was seen in 2013. In order to safely complete the work, the turning lane from southbound Airport Road onto the Boulder-bound Diagonal Highway will need to be closed from 9 a.m. to 2 p.m. on multiple weekdays until early April. Crews will suspend operations when creek flows become too high to safely operate equipment, then they’ll return in the late summer/early fall to complete the work.

Fairview Drive culvert replacement - Before

Fairview Drive CLOSED at Marshallville Ditch for Emergency Culvert Replacement

Fairview Drive will be CLOSED to cars and bikes at Marshallville Ditch (see map) starting at 7 a.m. on Tuesday, March 17. The closure will be in place 24-hours a day, 7-days a week for four to six weeks. All work is weather dependent. The existing culvert is failing and is at risk of collapse.

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

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

Projects Impacting Cycling


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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