Closures & Construction

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.

County Road Projects

The following county roadway projects result in travel impacts to both motorists and cyclists. All dates and times listed are weather dependent. Please visit this page regularly for updates on the projects listed and for information on new projects. View the Roadway Closure Map to see these projects and where roads/bridges remain closed due to the 2013 flood. 

  • Upper Fourmile Canyon Drive/Wall Street closed at Emerson Gulch Road for 4 hours on Monday, Oct. 5
    • 9 a.m. to 1 p.m on Monday, Sept. 28
    • Residents on Fourmile Canyon Drive west of Emerson Gulch and residents of Emerson Gulch will not be allowed through the work site during the project
    • Crews will be taking core samples from beneath the roadway in anticipation of the full flood recovery reconstruction project anticipated for the summer of 2016
    • Project Contact - Andrew Barth - 303-441-1032 or email 
  • DELAYED - Monarch Road CLOSED at Dry Creek in Niwot - 24 hours a day/7 days a week - NEW START DATE TBD. Project will last into December
    • Culvert replacement project and sanitary sewer relocation
    • DETOUR - Monarch Road RESIDENTS EAST OF DRY CREEK should use 79th Street to access their home
    • DETOUR - Monarch Road RESIDENTS WEST OF DRY CREEK should use CO Hwy 119/Diagonal to access home
    • Work schedule is weather permitting
    • Project Contact - Andrew Barth - 303-441-1032 or email 
  • Topaz Drive Flood Recovery Related Reconstruction requires closures Sept. 21 through October 2015
    • Topaz Drive access from 26th Street closed
    • Use Agate Road and Ruby Drive to access Topaz
    • 8 a.m. to 4:30 p.m. - Monday through Friday
    • Project Contact - Andrew Barth - 303-441-1032 or email 
  • Upper Lefthand Canyon patching and roadway resurfacing project COMPLETE
    • Project Contact - Andrew Barth - 303-441-1032 or email 
  • 2015 Community Use Road Reconditioning in County Subdivisions - COMPLETE

Cycling - Projects impacting cycling

The following roads have travel restrictions for cyclists only due to safety concerns with the road surface and heavy construction traffic stemming from the 2013 flood event. Please respect the restrictions. Boulder County and CDOT are working to reopen these areas to cyclists as soon as possible. View the  Cycling Closure Map . (NOTE - The map is being updated so some closures and restrictions may not appear.)

  • Monarch Road culvert project at Dry Creek
    • LoBo Trail will be diverted around the construction zone.
    • Cyclists will not be able to ride through the construction zone on Monarch Road
  • Lefthand Canyon Reconstruction anticipated to begin in December 2015
    • All travel restrictions on James Canyon Drive have been lifted
    • Need for travel restrictions will be evaluated when construction ramps up again in 2015
  • Learn more about safe cycling in Boulder County Canyons

Other Non-County Construction and Events resulting in travel restrictions

  • CDOT bridge rehabilitation
    • 3 bridges in Boulder County
      • US 287 and Coal Creek - Lafayette
      • Foothills Parkway and Diagonal - Boulder
      • Diagonal Highway over Four Mile Canyon Creek - Boulder
    • June 22 through Oct. 2015
    • Night Work - 7 p.m. to 5:30 a.m.
    • Expect lane closures, lane shifts and reduced speeds in work zones
    • Info = Project Email - Phone = 1-888-759-6197 (option 5)
  • CDOT Wetland Mitigation on east Valmont Road between 55th and 61st streets
    • CDOT creating new wetland area to mitigate wetland loss associated with US 36 Express Lane Project (more info below)
    • Expect work and travel delays from 7 a.m. to 7 p.m. - Monday through Friday
    • Info = 303-991-4591 or email
  • 2015 Special Events taking place throughout Boulder County
  • US 36 Express Lanes Project - Boulder to Denver - Learn more about lane and ramp closures and other travel restrictions - Work being completed by CDOT 

  • Learn about road closures in the City of Boulder at

 Related Links