I-70 Seibert-Stratton Roadway Improvements

About the Project

The Colorado Department of Transportation, in partnership with Harper Brothers Construction, will begin 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 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 panels and complete bridge rehabilitation to address aging infrastructure and improve structural integrity. Crews will also install a new concrete overlay and replace aging asphalt with reinforced concrete panels and/or hot-mix asphalt, 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
  • Fresh pavement striping to improve visibility and overall driver safety

In addition to the I-70 improvements, CO 57 between the I-70 interchange and US 24 within the Town of Stratton 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 a new HMA overlay, which will require intermittent ramp closures and traffic shifts during paving operations.

Work this Week & Lane Closures for I-70 Seibert-Stratton Roadway Improvements

Project Facts

  • Construction Cost: $20 million
  • Contractor: Volkert, Inc.
  • Timeline: April 2026 to October 2027. Winter shutdown 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 MP 407) and CO 57 (MP 0 to MP 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

Different from the traffic impacts, this should be the general working hours and schedule of the project. Example:

  • 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

Motorists can expect the following impacts during the period of construction:

  • 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 panel replacement 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
  • The speed limit on I-70 will be reduced through the work zone
  • Please be aware of construction vehicles entering and exiting the work area
  • Refer to COtrip.org for real-time travel conditions and road closures