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. 

  • Baseline Road lane shifts between Gapter and Cherryvale roads
    • Lane shifts will be necessary to complete a waterline replacement project
    • Cyclists will be asked to merge with motor vehcles
    • 9 a.m. to 4 p.m. - Monday through Friday
    • Expect delays - Traffic control personnel will be present to assist travelers
    • Project Contact - Dan Kvasvnicka - 303-441-3201
  • 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. 
    • Work will begin between Olde Stage Road and James Canyon Drive - Dec. 2015 through May 20, 2016
      • Requires full road closures - 8 a.m. to 4 p.m. - Monday through Friday
    • Project Contact - Andrew Barth - 303-441-1032 or email
  • Salina Junction Permanent Flood Repairs  - Expect travel delays
    • 8 a.m. to 4:30 p.m. - Monday through Friday
    • Expect up-to 15-minute travel delays during working hours
    • Longer delays may be needed - they will be posted here and on the project website 7-days in advance of the delay date
    • Work site will be controlled with traffic lights - 2 minute red lights with 15 seconds of green each way
    • Work expected to last until April 2016
    • Project Contact - Andrew Barth - 303-441-1032 or email
    • Project hotline provides additional project information - 303-730-4525 - updated weekly and as needed. 
  • DELAYED - Monarch Road CLOSED at Dry Creek in Niwot - 24 hours a day/7 days a week - NEW START DATE FEBRUARY 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 


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.)


Other Non-County Construction and Events resulting in travel restrictions

  • 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
  • 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
  • Permitted 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 www.BoulderConeZones.net.

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