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I-70 Seibert-Stratton Roadway Improvements
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– Project Announcement –
Long-term infrastructure improvements project planned for eastern Colorado travelers beginning soon
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About the Project
The Colorado Department of Transportation, in partnership with Harper Brothers Construction, will begin the Interstate 70 Seibert–Stratton Roadway Improvements project in mid-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.
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.
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Project Schedule
- Daytime work hours are Monday through Friday, beginning 30 minutes after sunrise and ending 30 minutes before sunset
- Possible weekend work may occur
- Work schedules may be impacted by weather and other unanticipated delays
Traffic Impacts
Preconstruction activities are expected to begin soon.
- Motorists may encounter eastbound and westbound shoulder and lane closures along I-70 near Seibert (MP 401 and 407) for preconstruction activities
- Anticipated in mid-May, traffic on I-70 will shift to a 24/7 head-to-head configuration, east and west of Seibert, for concrete paving and structure improvements
- Alternating-lane closures are expected along CO 57 (Colorado Avenue), between I-70 and US Highway 24 (Fourth Street), for roadway rehabilitation
- Intermittent ramp closures with detours and traffic shifts at the Seibert and Stratton interchanges
- 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 zone
- For current road conditions, visit COtrip.org
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Project location map of I-70 Seibert–Stratton Roadway Improvements Project located 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) in Kit Carson County.
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