Southwest I-25 Frontage Road near Timnath closed for underground drainage installation Oct. 3-21

Travel Advisory

September 27, 2022 - Northeastern Colorado - Full closures of the Southwest Frontage Road from north of the Colorado Mountain RV entrance to just south of County Road 34E will take place from 6 a.m., Oct. 3 until 5 p.m., Oct. 2

Timnath - As the Colorado Department of Transportation continues I-25 widening and drainage improvements, crews will install an underground drainage line, culvert and inlet under the Southwest Frontage Road between CO 392 and Kechter Road as part of the 100-year flood prevention portion of this project.

To safely place the new underground drainage system, a full closure of the Southwest Frontage Road from north of CO 392 (the Colorado Mountain RV entrance) to just south of County Road 34E will take place Oct. 3-21.

When complete, the project will increase capacity on I-25 by adding an Express Lane in both directions, constructing inside and outside shoulders, and replacing other aging bridges. The project will also improve multimodal access to regional transit throughout the corridor.

Travel Impacts

Full closures of the SW Frontage Road from north of the Colorado Mountain RV entrance to just south of County Road 34E will take place from 6 a.m., Oct. 3, until 5 p.m., Oct. 21. Access to local residences and businesses will be maintained. I-25 traffic will not be impacted during drainage installation.

Stay Informed

More information about this project is available at:

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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