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. Please visit this page regularly for updates on the projects listed and for information on new projects. View the Roadway Closure Map. (NOTE - the map is currently being updated, so these projects may not appear)

  • Valmont Road between 61st and 75th streets- Nighttime delays for asphalt patching - July 21 to 24
    • Maintenance Division patching numerous sections of west and east-bound Valmont Road between 61st and 75th streets
    • Work will take place over night 7 p.m. to 5:30 a.m.- Monday through Thursday, July 21 to 24
    • Delays of up to 20 minutes can be expected
    • Please use Jay Road or Arapahoe Road to avoid the work zone
    • Project Contact =Andrew Barth- 303-441-1032
  • Pine Brook Hills Subdivision - Retaining wall installation and roadway reconstruction
    • Crews will begin mobilizing in Pine Brook Hills on Monday, July 28 - Work is expected to wrap up in mid-November 2014
    • Work will take place 8 a.m. to 4:30 p.m. - Monday through Friday
    • Roadway closures will be necessary to complete the work. The following roads will be closed during the work:
      • Pine Brook Road - July through mid-October
      • Bow Mountain Drive - August through late-October
      • Timber Lane - September through November
    • Detours will be established
    • Project Information Hotline - 720-452-6762 or email Public Information Team
  • Wagonwheel Gap Road closed July 21 to 24 for culvert installation
    • Roadway closed to all users from 8 a.m. to 4 p.m. - Monday through Thursday, July 14 to 17 and July 21 to 24
    • Detours established & signed - Emergency serviced providers notified in order help with emergency response. 
    • Weather dependent
    • Additional closures may be necessary in August
      • Updates will be provided as more schedule is known
    • Project Contact =Andrew Barth- 303-441-1032
  • Highway 119 Underpass at Airport Road
    • Work began April 22 and is anticipated to last until late December, weather permitting.
    • Longmont-bound travelers will now move through "flyway" with 50 MPH speed restrictions
      • The flyway detour will be removed the week of July 21 to 25
      • Cars will shift back over to the main Diagonal Highway by Monday, July 28
    • Ogallala Road will be closed to all traffic until August 
    • Access to northbound Airport Road will remain open throughout the project. 
    • Project Contact =Andrew Barth- 303-441-1032
  • Lee Hill Shoulder Reconstruction & Retaining Wall Installation through end of July/ early August
    • Lee Hill is currently reduced to one lane of alternating traffic just west of the Boulder city limits 24-hours a day, seven days a week
    • Crews are installing emergency retaining walls and repairing the stream bank to prevent the roadway from collapsing. 
      • Roadway collapse would cause much longer roadway closures and would be more expensive
    • The work is expected to last until Thursday, July 31
    • To report an issue with the overnight traffic signal, contact Transportation Maintenance at 303-819-4437
    • Project Contact =Andrew Barth- 303-441-1032
  • Flagstaff Road Reconstruction - Learn more
    • Begins Monday, June 23 and will last through November 2014
    • Flagstaff Road closed to vehicles and cyclists - 8:30 a.m. to 3:30 p.m. - Monday through Friday
    • Access to Flagstaff above the closure can be achieved via Gross Dam Road off of Coal Creek Canyon Drive/Highway 72
    • 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
  • Marshall Road repaving project - Postponed until Aug. 14 - Full roadway closure on Aug. 14 and 15 for bridge work - Project ends Aug. 22
    • Marshall Road will be repaved from it's terminus with Broadway to its terminus with Cherryvale Road
    • Paving operations will take place between 8 a.m. and 4 p.m., Monday through Friday
    • One side of the roadway will remain open, and flaggers will direct traffic around work zones, so expect slight delays.
    • The roadway will be completely closed on Aug. 14 and 15 when crews repave the bridge over South Boulder Creek - Detours will be in place. 
    • Project Contact = Andrew Barth, 303-441-1032
  • LOBO Trail (Longmont - Boulder) Repairs at 95th Street - COMPLETE!
    • Repairs to the washed out portion of the LOBO Trail near 95th Street are complete and the trail is open to the public
    • Trail was damaged during 2013 flooding when Lefthand Creek overtopped its banks. 
    • Although the trail is open at this location, portions of the trail between 95th Street and the pedestrian bridge northeast of Ogallala Road are still in need of repair
      • Ongoing utility work has prevented the repairs at this spot. 
      • Please use caution navigating this area
      • The trail will need to be closed for a week at a date to be determined to complete the remaining repairs
    • Project Contact = Dave Webster - 303-441-3900

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.)

  • NEW - Apple Valley Road west of Lyons- Cycling restricted to locals with permits only - PER CDOT
    • No cycling on Apple Valley Road from Monday, July 28 through Sunday, Aug. 10
    • Restriction enforced as part of CDOT's work on US 36 west of Lyons (see below)
    • Project Information Hotline - 970-591-0001
  • 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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