Construction starts soon on CO 257 resurfacing and bridge repairs between Greeley and Windsor

Travel Advisory

May 11, 2023 - Northeastern Colorado - Drivers should prepare for periodic traffic delays on CO 257 starting in late May

Windsor – The Colorado Department of Transportation and Coulson Excavating Company will improve nearly five miles of Colorado Highway 257 between US 34 Business (Mile Point 5.6) in Greeley and Walnut Street (MP 10.4) in Windsor this year. Drivers will pass through at least two work zones and should prepare for periodic traffic delays on CO 257 starting in late May.

Planned bridge repairs at MP 7.6, which is approximately two miles north of US 34 Business, will require a temporary 20-day closure of CO 257 in the fall. “This is a busy construction season for CO 257 between Greeley and Windsor. Around 20,000 vehicles a day travel the corridor and several projects are about to break ground. Fortunately, we’ll be able to maintain traffic on CO 257 for most of the season. However, major bridge repair work on the south end and reconstruction of the highway in coordination with the railroad on the north end will require periodic full or directional closures” said CDOT Region 4 Transportation Director Heather Paddock. More information will be posted on message boards and on the project web page in advance of closures.

This project resurfaces CO 257 to provide a smoother driving surface and increase the longevity of the highway. Intersection improvements at Crossroads Boulevard will enhance mobility by adding a second eastbound left turn lane to northbound CO 257. Safety improvements include installing new guardrail, roadside delineators, and rumble strips.

CDOT will coordinate work and traffic impacts with adjacent projects. The Town of Windsor will make improvements to the CO 257 / Eastman Park Drive intersection this year. For more information on this project, please visit the town’s webpage at

Drivers should expect trucks entering and exiting various work zones. At times, a temporary concrete barrier wall will be used to separate the work zone from adjacent travel lanes. A work zone speed limit reduction may be in place. Drivers are encouraged to take alternate routes, use extra caution in the work zones, and follow all signs and markings.

CO 257 was identified as a priority corridor for CDOT’s Surface Treatment Program. Funding from the program will improve drivability and highway safety on CO 257.

Coulson Excavating Company was awarded the contract to construct the improvements. CO 257 will remain open during construction except for the 20-day full closure needed for the bridge repairs. The project may require single lane operations with flaggers alternating traffic or a temporary short-term detour for one direction of CO 257 at a time. Project completion is anticipated in fall 2023.

General work hours are Monday through Friday from 7 a.m. to 7 p.m. with occasional extended hours and weekend work. The construction schedule is weather-dependent and subject to change. Weekly updates are available on the project webpage.

CO 257 work zone map from US 34 to Walnut in Greeley
CO 257 work zone map from US 34 to Walnut in Greeley

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!