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 Lefthand Canyon patching and roadway resurfacing project starts July 27
    • Patching work will preceed roadway resurfacing
    • Mile Marker 12 to Mile Marker 16
    • 8 a.m. to 4:30 p.m. - Monday through Friday
    • Work will require closing one lane of traffic - flaggers will be used to move vehicles through zone
    • Project Contact - Andrew Barth - 303-441-1032 or email 
  • Hawthorn Road CLOSED between 2nd and 4th streets starting July 27
    • Flood repairs require road closure
    • 8 a.m. to 4:30 p.m. - Monday through Saturday
    • Work should be complete by Friday, Aug. 7
    • Access Goat Trail from Forest Ave
      • Hawthorn open after 5 p.m. and on Sundays
    • Project Contact - Andrew Barth - 303-441-1032 or email 
  • 2015 Community Use Road Reconditioning in County Subdivisions - Paving on Clubhouse Road in Gunbarrel starts Monday, June 20 - Detours will be established
    • Work will commence June 1 and will be complete in September - weather permitting
    • Roadway resurfacing and rehabilitation of of concrete curbs and pedestrian crossings/sidewalk ramps
    • Longview Drive in Niwot
    • Idylwild Trail, Clubhouse Road and Carter Trail in Gunbarrel
    • Travel delays and parking restrictions can be expected 8 a.m. to 4:30 p.m. - Monday through Friday
    • Signage will be placed in advance of work to inform residents, and traffic control personnel will assist with moving travelers around work zones
    • Project Contact - Andrew Barth - 303-441-1032 or email 

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.)

    • All travel restrictions on James Canyon Drive have been lifted until work starts again in June or July 2015
  • Learn more about safe cycling in Boulder County Canyons that are temporarily repaired

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)
  • Cherryvale Road closed 24-7 between Araphaoe Ave. and Wonderview Ct. - June 1 to Aug. 5
    • Work being completed by contractor on City of Boulder portion of Cherryvale Road
    • The intersection of Old Tale and Arapahoe Ave is also closed
    • Learn more on the City's Cone Zones Website
  • Private Water Utility Work in Overbrook Subdivision
    • Left Hand Water District replacing waterline in Overbrook Subdivision
    • Work will also involve street resurfacing in areas where waterline is replaced below the roadway
    • Work areas will include Spring Creek Trail, Fox Hunt Ct., and Gold Nugget Road. 
    • Work taking place 8 a.m. to 4:30 p.m., Monday - Friday
    • No road closures needed, but there may be short travel delays
    • Work will last through Oct. 2015
  • Private Gas Utility Work at Valmont Rd and 75th Street 
    • Alternating single-lane closures in place on 75th Street and sometimes on Valmont Road
    • Traffic control operations (flaggers) in place - 
    • 9 a.m. to 5 p.m.
    • Monday through Friday
    • Private crews replacing gas line for Xcel Energy
    • Contact - Travis Peters - Foreman Q3 Solutions - 720-454-5166
  • CDOT - SH 66 Overlay: US 287 to I-25
    • Begins Feb. 16, 2015
    • 6 a.m. to 8 p.m. - Monday through Friday from February to April - no significant travel delays expected
    • 8 p.m. to 6 p.m. - Sunday through Thursday - June and July - Expect delays 
    • Contact info - 844-253-3185 option #2
    • Project 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

Transportation Listserv 

Subscribe to the County's Transportation email listserv to receive timely information on projects, roadway closures, travel impacts and other information. 

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