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. 

  • Niwot Road closed Dec. 28 to Dec. 31
    • Niwot Road closed 24/7 from 7 a.m., Dec. 28 to 7 p.m., Dec. 31 for culvert replacement 
    • Closed between Niwot Hills Drive (Just east of Niwot High) and North 95th Street
    • Detours route = Hwy 52/Mineral Road to 79th Street
    • Local access maintained 
      • Quiet Retreat Court allowed access by entering from 95th Street onto westbound Niwot Road
    • Work expected to last until late January 2015.
    • Travelers can expect minor delays on Niwot Road after the closure period. 
    • Project Contact =Andrew Barth- 303-441-1032
      Temporary paving in Lefthand Canyon
    • East County Line Road Bridge Reconstruction
  • East County Line Road NOW OPEN
  • Pine Brook Hills Subdivision - Retaining wall installation and roadway reconstruction
    • Crews began in Pine Brook Hills on July 28 - Work is expected to wrap up in late-November 2014
    • Work will take place 8 a.m. to 4:30 p.m. - Monday through Friday
    • Roadway closures necessary to complete work. The following roads are closed during the project:
    • Timber Lane Retaining WallPine Brook Road - Closed through late early December
      Bow Mountain Drive - Closed through through early December
      Timber Lane -  Single-lane closure through early December
    Highway 119 Underpass at Airport Road
    • The overall project began April 22 and is anticipated to last until late December, weather permitting.
    • Hwy 119 will be reduced to one-lane at various times during the project to accommodate construction vehicles and work area shifts
    • Ogallala Road will be closed to all traffic until Aug./Sept.
    • Access to northbound Airport Road will remain open throughout the project. 
    • Project Contact =Andrew Barth- 303-441-1032
    Flagstaff Road Reconstruction - ROAD NOW OPEN - Learn more 
    • Crews built a bridge in the area that washed out during the Sept. 2013 flood
    • Project Contact = Boulder County -  Andrew Barth, 303-441-1032 OR Structures Inc - 720-244-9150

    Cycling Restrictions

    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.)

    • CDOT - US36 (west of Lyons) Closed to Cyclists  - Likely until the fall 2014 
      • 24 hours a day, seven days a week, until the fall of 2014
      • To help facilitate emergency roadway repairs stemming from the 2013 flood event
        • Work being completed by CDOT
      • Westbound (Lyons to Estes Park) closures start at mile marker 10.7 (County Road 47) and continue through mile marker 11.3.
      • Eastbound (Estes Park to Lyons) closures start at mile marker 16.2 (west of County Road 80) and continue through mile marker 19 (near Planet Bluegrass)
      • Learn more at the CDOT project website or call the project hotline - 970-591-0001
    • James Canyon - Cycling restricted to locals with permits only
      • Effective Thursday, May 8, 2014
      • Also applies to non-local vehicles and bikes- guests of residents and service vehicles permitted (i.e., mail, deliveries, school buses, contractors) 
      • Extensive flood recovery work taking place throughout the canyon
      • Heavy machinery + temporary roads = unsafe riding and driving conditions
      • Call 303-441-3650 to obtain a cycling permit  

      Other Non-County Construction and Events resulting in travel restrictions


      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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