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. 

  • Lee Hill Drive - One lane - Nov. 19 & 20
    • Lee Hill Drive reduced to one lane from 9 a.m. to 5 p.m. on Wednesday and Thursday, Nov. 19 an 20
    • Flaggers will be used to move traffic around the work zone
    • Crews working to complete minor flood recovery repairs on Lee Hill Retaining Wall
    • Project Contact =Andrew Barth- 303-441-1032
  • Niwot connectivity improvements start Monday, Oct. 20 - minor delays can be expected on Niwot Rd.
    • Pedestrian improvements will be constructed at the following Niwot Road intersections
      • Franklin Street
      • 2nd Avenue
      • Longview Drive
    • Franklin Street will be closed from Wednesday, Nov. 5 through Wednesday, Nov. 12 - WEATHER PERMITTING
    • Other areas will see minor daytime traffic - 8 a.m. to 4:30 p.m. - Monday through Friday
    • Traffic control personnel will be used for areas of alternating traffic
    • Project will last until mid-December 2014
    • Projects are part of the 2012 Niwot Transportation & Connectivity Plan
    • Project Contact =Andrew Barth- 303-441-1032
  • Subdivision paving in Heatherwood
  • 3 Subdivision Paving Projects will require detours, daytime driving delays and parking restrictions
    • Westview Drive begins Thursday, Sept. 25 and ends Oct. 8
    • Heatherwood Drive begins Oct. 8 and ends Nov. 7
    • Twin Lakes begins Oct. 14 and ends Nov. 21
    • Daytime parking restrictions 7 a.m. to 5 p.m.
    • Travel delays may occur but should be short - Detours may be established
    • Learn more about Subdivision Paving
    • Temporary paving in Lefthand Canyon
  • Lefthand Canyon Drive washout repaving through early November
    • Asphalt will be applied to the areas of Lefthand Canyon Drive, between Hwy 36 and mile marker 11, that washed out during the 2013 flood
    • 7 a.m. to 7 p.m. - Monday through Friday
    • Delays of up to 15-minutes can be expected during working hours
    • Traffic control/flaggers will be on site directing travelers - Please use caution 
    • Additional roadside stabilization work will also take place in many areas
    • Project Contact =Andrew Barth- 303-441-1032
    • East County Line Road Bridge Reconstruction
  • East County Line Road Bridge to be replaced starting Monday, Aug. 25 - construction expected through early December
    • Crews will rebuild the bridge over St. Vrain Creek that washed away during the 2013 flood
    • The road will remain closed between Hwy 119 and Quicksilver Road until the bridge is completed in early December
    • Project Contact =Andrew Barth- 303-441-1032
  • 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
    • Timber Lane Retaining Wall
    • Roadway closures will be necessary to complete the work. The following roads will be closed during the work:
      • Pine Brook Road - Closed through late November/early December
      • Bow Mountain Drive - Closed through through late November/early December
      • Timber Lane -  Single-lane closure through late November/early December
    • Detours will be established
    • Project Information Hotline - 720-452-6762 or email Public Information Team
  • 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 - Learn more 
    • Flagstaff Road To REOPEN AT 3:30 p.m. on Friday, Nov. 21
    • Flaggers will be used on Monday and Tuesday, Nov. 24 and 25 - Delays of up to 10-minutes can be expected
    • Crews are building 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 within Boulder County

      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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