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.

• Subscribe to the Transportation Email Listserv to receive timely project updates and other construction information
• Use the Road Service Request Form to let us know about an issue on area roads

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.

• North County Line Road/Larimer CR 2 – Lane & Full Road Closures for Culvert Project
  • Replacing culverts at the Little Thompson River crossing towards the western end of the road, near N. 83rd/CR 23E
  • Daytime, weekday lane closures at Little Thompson River during most of the work, except for the closure (see below)
  • FULL CLOSURE for two weeks – exact dates TBD
    • Anticipated to begin Wednesday, Dec. 26, 2018, which means closure lasts through Wednesday, Jan. 9
    • No travelers will be allowed over the river during the closure (trucks, cars, bikes, etc.)
    • North County Line/LCR 2 residents with driveways west of the river will need to use N. 83rd/CR 23E
    • North County Line/LCR 2 residents with driveways east of the river will need to use N. 95th/S. CR 21
  • Anticipated project end date = Monday, Jan. 14, 2019
  • 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:
    • Intersection with Logan Mill Road – New bridge being built
    • Lower Fourmile Canyon (just north of CO 119/Boulder Canyon Drive to Salina Junction)
  • Upper Fourmile Canyon (west of Salina Junction)
    • Up-to 15-minute delays between Salina Junction and Emerson Gulch Road
      • 8 a.m. to 4:30 p.m. – Monday through Friday
    • 2-hour, weekday roadway closures through November 2018
      • West of Emerson Gulch Road to Sunset
      • Road Closed – 11:00 a.m. to 1 p.m.
      • Open – 1 to 1:30 p.m.
      • Road Closed – 1:30 to 3:30 p.m.
  • NON-RESIDENT CYCLING RESTRICTIONS IN FOURMILE CANYON DURING WORKING HOURS – SEE BELOW
  • Project Contact – Andrew Barth – 303-441-1032

• Wagonwheel Gap Road Flood Recovery Project – Lane closures & Travel Delays
  • Expect single-lane closures and travel delays ranging up to 15-minutes
  • Longer delays may be necessary at times – visit the project website for detailed information
  • Project Contact – Andrew Barth – 303-441-1032

Cycling – Projects impacting cycling

• Fourmile Canyon Drive/Gold Run Road DAYTIME-WEEKDAY CYCLING NON-RESIDENT RESTRICTIONS
  • No recreational/non-resident cycling in Fourmile Canyon
    • 8 a.m. to 4:30 p.m. – Monday through Friday
    • CYCLING WILL BE ALLOWED ON Monday, SEPT. 3 as no construction will take place on these holidays.
  • 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

• Northern Water – Southern Water Supply Project
  • Northern Water is constructing a new pipeline between Carter Lake in Larimer County and Boulder Reservoir in Boulder County
  • The project will require short travel delays on Boulder County Roads including (see map):
    • N. 75th Street
    • N. 73rd Street
    • N. 63rd Street
    • Hygiene Road
    • Niwot Road
  • Project Website
  • Contact Information
• Diagonal Highway/CO 119 Lane Reduction & Off-Ramp CLOSURE (CDOT and Diagonal Crossing Housing Project)
  • Monday, Oct. 29 to Wednesday, Nov. 7 – 24 hours a day
  • Northbound CO 119 reduced to one lane from 47th Street to the exit ramp off of CO 157/Foothills Parkway
  • Exit ramp from CO 157/Foothills Parkway is currently closed
    • Detours in place at Jay Road
• Valmont Road CLOSURE at BNSF Railroad Track
  • Tuesday, Nov 6 to Sunday, Nov. 20 – 24-hours a day
  • Valmont Road CLOSED between 34th Street and Wilderness Place
  • BNSF replacing railroad crossing and City of Boulder working on roadway and transportation infrastructure improvements
  • Local access to businesses will be maintained.
  • More information.
• Special Event Permit Requests – Pending & Approved taking place throughout Boulder County
• Learn about road closures in the City of Boulder at www.BoulderConeZones.net.
• Learn about road closures in Longmont
• Learn about road closures in Lafayette
• Learn about road closures in Louisville
• Learn about road closures in Erie