CO 170 culvert replacement project to begin March 13

Project Update

March 8, 2023 - Northwestern Colorado - Daytime single lane closures and shoulder closures expected on CO 170/Marshall Road

Boulder County – Culvert replacement work is expected to begin at Colorado Highway 170 and Marshall Road on March 13. Tricon 2 LLC has been selected for this project, with work expected to be completed in May. 

Crews will begin placing signs along the project on March 6 along CO 170 from milepoint .6 to MP 3.3, and work will begin on March 13. Work consists of replacing a culvert with wing walls underneath the roadway and excavating and patching asphalt along the highway. 

CO 170 project map near Superior in Boulder County
CO 170 at Mile Post 3.2 project map near Superior in Boulder County

Work will generally take place Monday through Friday, 7 a.m. to 7 p.m. at the intersection, with construction crews utilizing single lane closures and shoulder closures along CO 170 and Marshall Road. 24-hour single lane closures will be in effect utilizing traffic signals. Alternative routes along US 36 are advised.

Travel Impacts

  • General working hours for this project are Monday through Friday, 7 a.m. to 7 p.m.
  • Impacts include single lane closures and shoulder closures along CO 170
  • Temporary traffic control
  • Weekend work may occur

Project Information

For additional information about this project, contact the project team.

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!

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