Closures & Construction

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 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 83rd Street (Niwot) culvert replacement and roadway resurfacing project – Delays and road & trail closures
    • Project Area = Niwot Road to Diagonal Highway/SH 119
    • Lane reductions – 8 a.m. to 4:30 p.m.
    • 20-day full closure of N. 83rd will be necessary to complete the culvert work and railroad crossing rehabilitation (conducted by BNSF) – Exact date to be determined
    • Detours will be established for the road, the LoBo Trail, and the Niwot Loop Trail
    • Project expected to last until early November
    • Project Website
    • Project Contact – Andrew Barth – 303-441-1032
  • 95th Street (Valmont and Isabelle) Intersections and Resurfacing Project – Lane reductions and full road closures through October
    • Starts 8 a.m. on Monday, June 26
    • June 26 through July
      • Full closure of 95th between Valmont and Lookout roads
      • Lane reductions between Valmont Road and Lafayette city limits
      • 8 a.m. to 4:30 p.m. – Monday through Friday
    • Thursday, August 3 through November – FULL CLOSURE OF 95th STREET BETWEEN LOOKOUT & LAFAYETTE CITY LIMITS
      • 95th Street residents who live north of the project area (including Phillips Road, Gunbarrel Ridge Road, Owl Lane, and Avocet Lane) will need to access their homes from the north at Lookout Road and 95th Street
      • 95th Street residents who live south of the project area (including Lake Meadow Drive, Blue Heron Estates, Galt Way, and Prairie Ridge Drive) will need to access their homes from the south at Arapahoe Road and 95th Street.
      • Full closure of Isabelle Road between US 287 and 95th Street
        • Residents on Isabelle Road will need to access their homes from US 287
      • Full closure of Valmont Road between 75th and 95th streets
        • Residents of Valmont Road will need to access their homes from the 75th Street side
        • Access to White Rocks Trailhead will be maintained from the west via 75th
    • Detours will be signed – Alternate routes are strongly advised
    • Project Contact – Andrew Barth – 303-441-1032
  • James Canyon Drive Flood Recovery Permanent Repairs
    • Expect travel delays between Lefthand Canyon and Jamestown
    • Single Lane Closures – Multiple locations – 24 hours a day/7 days a week
    • Road will remain open to cyclists
      • Expect heavy truck traffic and rough travel conditions in short stretches
    • December 2018 estimated completion date – weather permitting
    • Project Contact – Andrew Barth – 303-441-1032
  • North 71st Street – Full Closure – June 2 to July 21, 2017
    • 71st Street CLOSED 24/7 at Boulder/Lefthand Ditch just north of the LoBo Multi-Use Trail
    • Culvert being replaced
    • Gunbarrel Tech Center detour from Hwy 52 south on 71st Street
    • Gunbarrel Estates detour from Lookout Road north on 71st
    • No through traffic
    • LoBo Trail access from Lookout Road north on 71st
    • Project Contact – Andrew Barth – 303-441-1032
  • Annual Resurfacing Program – Expect intermittent single-lane closures
    • The following roads are part of the 2017 annual resurfacing program, the dates listed are anticipated construction timeframes:
      • 76th Street – COMPLETE
      • Valmont Road – COMPLETE
      • 75th Street from Lookout to Valmont road – Complete by July 24
      • Airport Road from SH 119/Diagonal to Longmont city limits – Underway – Complete by July 27
      • East County Line Road from Hwy 52 to Longmont city limits – Underway – Complete by end of August
        • Sections of East County Line Road will be closed during paving operations in August
        • Detours will be established
    • Expect intermittent single-lane closures and some long delays
    • 8 a.m. to 4:30 p.m. – Monday through Friday
    • Project Contact – Andrew Barth – 303-441-1032
  • Wagonwheel Gap Road Flood Recovery Project – Lane closures & Travel Delays
    • Permanent repairs on Wagonwheel Gap Road and in Fourmile Canyon Creek started Monday, May 22, 2017
    • Expect single-lane closures and short (3 to 5 minute) travel delays
    • Longer delays may be necessary at times – visit the project website for detailed information
    • Bow Mountain Drive closed at Wagonwheel Gap Road while a new bridge is constructed – June/July through Sept./Oct. 2017
    • Project Contact – Andrew Barth – 303-441-1032
  • East County Line Road single-lane closures at Hwy 52 – PROJECT DELAYED UNTIL JULY 31
    • Expect infrequent single-lane closures on East County Line Road at Hwy 52
    • Lane closures set up on an as-needed basis when working on the surface and guardrail of the bridge over east Boulder Creek
    • 8:30 a.m. to 4 p.m. – Monday through Friday
    • Crews working to repair damages sustained during the Sept. 2013 flood event
    • Project Contact – Andrew Barth – 303-441-1032

Project Area Map

Cycling – Projects impacting cycling

View the Cycling Closure Map .

Other Non-County Construction and Events resulting in travel restrictions

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Boulder, CO 80304

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