I-70 Seibert-Stratton Roadway Improvements

Project Update | Head-to-head traffic switch and vehicle width restriction

A head-to-head traffic switch is anticipated in early July. During this phase, an 11-foot vehicle width restriction will be in place, and vehicles wider than 11 feet should plan an alternate route.

About the Project

The Colorado Department of Transportation, in partnership with Harper Brothers Construction, began the I-70 Seibert–Stratton Roadway Improvements project in April. The project is located on Interstate 70 east and west of Seibert (Mile Point 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.

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. 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.

Work this Week & Lane Closures for I-70 Seibert Work this Week & Lane Closures for CO 57 Stratton

Project Facts

  • Construction Cost: $31 million
  • Contractor: Volkert, Inc.
  • Timeline: April 2026 to October 2027
    • Winter shutdown is anticipated between October 2026 and April 2027
  • Location: CO 57 and I-70 
    • Nearest Towns/Cities: Seibert and Stratton
    • Mile Point(s): I-70 (MP 401 to 407) and CO 57 (MP 0 to 5)
    • County: Kit Carson
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
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

Project Benefits

  • Improve safety, mobility and long-term maintenance along this important eastern Colorado corridor
  • Concrete panels that are cracked, broken and not seated properly will be replaced to mitigate further deterioration of the road
  • Bridge deck repairs prevent further deterioration, helping the bridge last longer without the need for full replacement
  • Guardrails will be upgraded to prevent vehicles from leaving the roadway, reducing the severity of crashes and minimizing the risk of injuries and fatalities
  • New signage ensures motorists receive accurate directions, speed limits and warnings, improving safety and reducing driver confusion

Work Schedule

  • Daytime work hours are Monday through Saturday, beginning 30 minutes before sunrise and ending 30 minutes after sunset
  • There is no work scheduled on Sundays
  • Work schedules may be impacted by weather and other unanticipated delays

Traffic Impacts

Motorists can expect the following impacts along I-70 east and west of Seibert (MP 401 to 407) during the period of construction:

  • Eastbound and westbound left shoulder and left lane closures
  • Beginning in early July, westbound I-70 traffic will shift to the eastbound lanes in a 24/7 head-to-head configuration for concrete paving and structure improvements
  • An 11-foot width restriction is anticipated when traffic shifts to a head-to-head configuration
  • Intermittent ramp closures with detours and traffic shifts
  • Expect reduced speeds, narrowed lanes and changing traffic patterns
  • Please be aware of crews working in the area and construction vehicles entering and exiting the work zone
  • Refer to COtrip.org for real-time travel conditions and road closures