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Closures & Construction

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.

Travel Impacts

County Road Projects

Baseline Road (at Cherryvale Road) Culvert Replacement

A culvert replacement project is currently in progress on Baseline Road just east of Cherryvale Road. In addition, Xcel Energy will be working in the same area to replace some of their underground infrastructure. Work will take place between 8 a.m. and 4:30 p.m., Monday through Friday. Travelers along the road can expect lane closures and travel delays during working hours. A temporary traffic signal will be used at night and on weekends as the road will be reduced to one lane 24-hours a day, seven days a week. A full road closure may be necessary to perform certain aspects of the work. More information will be posted should the road need to be closed. The project is anticipated to last into February 2021.

US 287 & Isabelle Road Intersection Safety Improvements Project

  • Isabelle Road CLOSED 6 to 11:59 p.m. on Thursday Jan. 21
    • Closed to all but Isabelle Road residents at 95th Street on the west
    • Closed at N. 107th on the east side
  • Regular Project Hours and Impacts
    • 8 a.m. to 4:30 p.m., Monday through Friday
    • Lane closures and traffic shifts on US 287 and on Isabelle Road
    • Expect delays – Alternate routes advised
  • Project anticipated to last until May 2021
  • Project Website

St. Croix Street closed at Jay Road starting Jan. 4

Boulder County Road Maintenance will be installing a new culvert to improve drainage. In order to complete the work, St. Croix Street will need to be closed at Jay Road for approximately two weeks. Detours will be established at Nevis Street on the north and St. Johns Avenue on the east.

61st Street Culvert Replacement Project requires lane reduction and temporary traffic signal between Jay and Valmont roads

  • Map of project area and closure locations
  • Expect delays between Valmont and Jay roads
    • 8 a.m. to 4:30 p.m., Monday through Friday, January through May 2021
    • Temporary traffic signals and single-lane closures will be in place 24-hours a day
    • Speeds reduced to 15 MPH
    • Cyclists will need to use the main travel lane
  • City of Boulder Airport-Andrus Multi-Use Project also taking place in the vicinity

71st Street Construction Project

  • Culvert installation and roadwayand trail improvements
  • January 2021 through June 2021
  • Expect daytime, weekday single-lane and a full-road closure (below)
  • 71st CLOSED – Feb. 1 through Feb. 26, 2021
    • 71st Street will be closed between Glacier View Road and Winchester Circle
    • Gunbarrel Tech Center/Winchester Circle off of 71st Street will need to be accessed by using CO 52 from the north
    • See Map
  • Project Website

Thank you for following restrictions! We apologize for any inconvenience.

For more information about Boulder County road travel impacts, please contact – Andrew Barth – 303-441-1032

Projects Impacting Cycling

OLDE STAGE ROAD reduced to a single lane in two locations

  • Olde Stage Road construction requiring flaggers during daytime, weekday working hours
  • Expect work to last through August

South Boulder Road Emergency Repairs – Aug. 17 to Aug. 28

  • Emergency concrete panel replacement on South Boulder Road (SBR) between 55th Street and Cherryvale Road.
  • Expect Delays – lane closures and shifts on South Boulder Road
  • Cyclists will need to merge with motor vehicles in the travel lane
  • 8 a.m. to 4:30 p.m. – Monday through Friday
  • Project anticipated to last through August
  • Project website

Thank you for following restrictions! We apologize for any inconvenience.

Project Contact – Andrew Barth – 303-441-1032

Non-County Projects

Related Links

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Boulder, CO 80304

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