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.

County Road Projects with Travel Impacts

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.

  • 95th Street (Lookout to Plateau) Reconstruction
    • Expect infrequent, intermittent travel delays starting April 22 while crews begin operations
    • Full construction expected to start week of April 29
      • Daytime, weekday lane reductions and shifts – Expect longer delays controlled by flagging personnel
    • Project Contact – Andrew Barth – 303-441-1032
  • Railroad Crossing Quiet Zone Implementation Project along Diagonal Highaway/SH 119
    • 2nd Avenue at Diagonal – COMPLETE
    • Independence Road at Diagonal – COMPLETE
    • 55th Street at Diagonal – COMPLETE
    • Monarch Road at Diagonal – May 6 to May 20
      • This location will require a full road closure for approximately two weeks (24-hours a day, weekends included). Vehicles will be detoured to 79th Street.
    • Jay Road at Diagonal – April 23 to May 7
      • Lane closures and shifts during the day
    • Niwot Road at Digonal – TBD
      • Lane closures and shifts during the day
    • Project Contact – Andrew Barth – 303-441-1032
  • Lefthand Canyon reduced to one-lane at Glendale Gulch
    • Culvert/roadway project requires single-lane reduction and traffic signal use 24/7 at Glendale Gulch (mile marker 7)
      • Project will reduce the curve at Glendale Gulch by realigning the road
    • Traffic signal will be in place 24/7 until May/June
    • Project Contact – Andrew Barth – 303-441-1032
  • N. 55th Street CLOSED for culvert replacement
    • N. 55th CLOSED at Boulder/Whiterock Ditch, just south of Pioneer Road
    • CLOSURE in place 24/7 until end of May
    • Project Contact – Andrew Barth – 303-441-1032
  • Fourmile Canyon Flood Recovery Work – Expect delays on Fourmile Canyon Drive and Gold Run Road
    • Normal Hours – 8 a.m. to 4:30 p.m. – Monday through Friday
    • Delays of up-to 15-minutes in/at:
      • Lower Fourmile Canyon (just north of CO 119/Boulder Canyon Drive to Salina Junction)
      • Gold Run
      • Upper Fourmile between Wall Street and Sunset – Gravel roadway resurfacing will start Monday, April 29
    • Upper Fourmile Canyon (west of Salina Junction)
      • Project currently on hold until spring 2019
    • Project Contact – Andrew Barth – 303-441-1032

Cycling – Projects impacting cycling

    • No recreational/non-resident cycling in Fourmile Canyon
      • 8 a.m. to 4:30 p.m. – Monday through Friday
    • Residential cycling exception – Residents must contact Boulder County Transportation for pass
      • Residents can contact Andrew Barth (info below) to obtain a residential cycling pass
    • SEE MAP
    • Restrictions in place due to increased volume of large truck traffic associated with three construction projects
      • Thank you for following restrictions
    • Project Contact – Andrew Barth – 303-441-1032

View the Cycling Closure Map .

Other Non-County Construction and Events resulting in travel restrictions

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2525 13th Street
Boulder, CO 80304

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Boulder, CO 80306