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. 

  • Longmont Dam Road Flood Recovery and Stream Restoration - Lane reductions through June 2016
    • Expect lane closures 7 a.m. to 4:30 p.m. - Monday through Friday 
    • Traffic control personnel will be used to move travelers through the work zone, but expect short (up to 5 minute) delays
    • Please use caution
    • Project website
    • Project Contact - Andrew Barth - 303-441-1032 or email 
  • Monarch Road CLOSED at Dry Creek in Niwot - 24 hours a day/7 days a week - through August 2016
    • 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 
  • N. 83rd Street CLOSED TO ALL TRAVELERS (INCLUDING CYCLISTS) for flood recovery bridge construction - THROUGH AUGUST 2016
    • N. 83rd closed 24/7 between Woodland Road and Larimer CO Rd 4
    • Crews constructing a bridge over Little Thompson River - Culverts destroyed during 2013 flood
    • Project anticipated to last until end of August - Weather permitting
    • Project Contact - Andrew Barth - 303-441-1032 or email
  • Lefthand Canyon Drive Permanent Flood Recovery Construction - Dec. 14, 2015 through Nov. 2016 - MAJOR TRAVEL RESTRICTIONS IN PLACE
    • Visit the project website for complete information and to sign up for the project listserv. 
    • Project Contact - Andrew Barth - 303-441-1032 or email
  • Salina Junction Permanent Flood Repairs  - COMPLETE
    • Project Contact - Andrew Barth - 303-441-1032 or email 

Cycling - Projects impacting cycling

View the  Cycling Closure Map

  • Lefthand Canyon Reconstruction - SIGNIFICANT TRAVEL RESTRICTIONS FOR ALL MODES
  • N. 83rd Street CLOSED TO ALL TRAVELERS (INCLUDING CYCLISTS) for flood recovery bridge construction - THROUGH AUGUST 2016
    • N. 83rd closed 24/7 between Woodland Road and Larimer CO Rd 4
    • Crews constructing a bridge over Little Thompson River - Culverts destroyed during 2013 flood
    • Project anticipated to last until end of August - Weather permitting
    • Project Contact - Andrew Barth - 303-441-1032 or email
    • Learn more about safe cycling in Boulder County Canyons


    Other Non-County Construction and Events resulting in travel restrictions

    • CDOT - SH 7 (Estes Park to Raymond) - July 5, 2016 through Oct. 2017
    • Xcel Energy Gas Line Replacement on 95th Street requires lane shifts and travel delays
      • North 95th Street between Oxford and Isabelle roads
      • Project will require lane shifts and closures during working hours - Expect delays
      • January through December 2016
      • INFO - 1-855-875-7633 or email
      • Project Website
    • Permitted Special Events taking place throughout Boulder County
    • Learn about road closures in the City of Boulder at www.BoulderConeZones.net.

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