CO 7 (Arapahoe Avenue) and 38th Street intersection closure in Boulder July 25 to 28

Travel Advisory

July 24, 2025 - Northeastern Colorado - Temporary weekend closure needed for long-term road improvements

Boulder County — Beginning Friday, July 25, at 5 p.m. through Monday, July 28, at 5 a.m., the north intersection of Colorado Highway 7 and 38th Street will be closed for milling and paving operations. A detour will be in place to maintain access to 38th Street.

Work on this project is scheduled for completion in late December 2025.

Crews will perform reclamation work, removing the existing asphalt and reconditioning base materials to create a stronger foundation, followed by a new asphalt overlay to improve smoothness and safety for drivers. This work is part of an ongoing project to improve roadway conditions and extend pavement life.

Traffic Impacts

  • Friday, July 25, at 5 p.m. through Monday, July 28, at 5 a.m., the north intersection of CO 7 and 38th Street will be closed over the weekend
  • Detour from 38th Street
    • Travel north on Exposition Drive, north on 38th Street, west on Walnut Street and south on 33rd Street to reconnect with CO 7
  • Detour from CO 7 and 38th Street
    • Travel west on CO 7, north on 33rd Street and east on Walnut Street
  • Motorists should follow posted detour signs
  • Business access will remain open
  • The speed limit will be reduced to 35 MPH throughout the work zone
  • Please be aware of construction vehicles entering and exiting the work area
  • For current road conditions, visit COtrip.org
A map of the CO 7 resurfacing project detailing the detour routes of 33rd Street and 38th Street. CO 7 (Arapahoe Avenue) north intersection closed at 38th Street.
A map of the CO 7 resurfacing project detailing the detour routes of 33rd Street and 38th Street. CO 7 (Arapahoe Avenue) north intersection closed at 38th Street.

Project Information

For additional information about this project:

Know Before You Go

Travelers are urged to “know before you go.” Gather information about weather forecasts and anticipated travel impacts and current road conditions prior to hitting the road. CDOT resources include:

Remember: Slow For The Cone Zone

The following tips are to help you stay safe while traveling through maintenance and construction work zones.

  • Do not speed in work zones. Obey the posted speed limits.
  • Stay Alert! Expect the unexpected.
  • Watch for workers. Drive with caution.
  • Don't change lanes unnecessarily.
  • Avoid using mobile devices such as phones while driving in work zones.
  • Turn on headlights so that workers and other drivers can see you.
  • Be especially alert at night while driving in work zones.
  • Expect delays, especially during peak travel times.
  • Allow ample space between you and the car in front of you.
  • Anticipate lane shifts and merge when directed to do so.
  • Be patient!

Download the COtrip App!

The new free COtrip Planner mobile app was designed to meet the growing trend of information on mobile and tablet devices for the traveling public. The COtrip Planner app provides statewide, real-time traffic information, and works on mobile devices that operate on the iOS and Android platforms. Visit the Google Play Store (Android devices) or the Apple Store (iOS devices) to download!