I-70 Seibert-Stratton Roadway Improvements begin in early April

Project Announcement

March 27, 2026 - Northeastern Colorado - Long-term infrastructure improvements planned for eastern Colorado travelers

Kit Carson County — The Colorado Department of Transportation, in partnership with Harper Brothers Construction, will begin the Interstate 70 Seibert–Stratton Roadway Improvements project in early April.

The project is located on I-70 east and west of Seibert (Mile Points 401 to 407), and along Colorado Highway 57 (Colorado Avenue) in Stratton, between I-70 and US Highway 24 (Fourth Street).

The expected completion date is October 2027, with a winter shutdown anticipated between October 2026 and April 2027.

Project location map for the I-70 Seibert–Stratton Roadway Improvements Project located east and west of Seibert (Mile Point 401 to 407), and along CO 57 (Colorado Avenue) in Stratton, between I-70 and US 24 (Fourth Street) in Kit Carson County
Map showing two locations of improvements on I-70 and CO 57.

The initial phase of the project will begin east and west of Seibert and will involve constructing several crossover detours to facilitate head-to-head traffic. This configuration will help protect crews while maintaining traffic flow through the work zone. To enhance safety and extend the life of the roadway and structures, crews will replace deteriorated concrete pavement and complete bridge rehabilitation to address aging infrastructure and improve structural integrity. Crews will also install a new concrete overlay and replace aging concrete pavement, creating a more durable and long-lasting driving surface.

Bridge rehabilitation will include removing and resurfacing the existing bridge deck with a new concrete overlay, replacing joints and completing structural repairs beneath the bridge deck, improving ride quality and reducing long-term maintenance needs for the traveling public. Other improvements include mainline guardrail replacement, installation of new delineators, updated roadway signage and fresh pavement striping to improve visibility and overall driver safety.

In addition to the I-70 improvements, work will be done on CO 57 between the I-70 interchange and US 24 within the Town of Stratton. This segment will be milled and paved with a hot-mix asphalt overlay to create a smoother, more durable driving surface and extend the life of the roadway. Additional upgrades include reconstructing select curb and gutter sections, as well as installing new signage and pavement striping. Crews will also resurface the on- and off-ramps at the Seibert and Stratton I-70 interchanges with new HMA overlay, which will require intermittent ramp closures and traffic shifts during paving operations.

“This project is one of many interstate projects the CDOT has invested in over the past eight years. It will significantly improve an aged and vital section of the I-70 corridor for the local agricultural businesses, the transcontinental trucking deliveries and the traveling public,” said CDOT Regional Transportation Director Heather Paddock. “By improving roadway conditions and operations, we are enhancing safety and reliability along a key corridor route.”

The project is designed to improve safety, mobility and long-term maintenance along this important eastern Colorado corridor. Upon completion, motorists traveling through the Seibert and Stratton area will experience a smoother driving surface and improved roadway conditions, helping ensure safe and reliable travel for years to come.

Project Schedule

  • Daytime work hours are Monday through Friday, beginning 30 minutes before sunrise and ending 30 minutes after sunset
  • Possible weekend work may occur
  • Work schedules may be impacted by weather and other unanticipated delays

Traffic Impacts

  • Traffic on I-70 will shift to a 24/7 head-to-head configuration, east and west of Seibert (MP 401 to 407) for concrete paving and structure improvements
  • Alternating-lane closures are anticipated along CO 57 (Colorado Avenue), between I-70 and US 24 (Fourth Street), for roadway rehabilitation
  • Intermittent ramp closures with detours and traffic shifts
  • A 12-foot width restriction will be in place
  • Speed limit on I-70 will be reduced to 55 MPH
  • Please be aware of construction vehicles entering and exiting the work area
  • For current road conditions, visit COtrip.org

Project Contact 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!

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!