I-70 Seibert-Stratton Roadway Improvements

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 November 2026 and April 2027.

The initial phase of the project began east and west of Seibert and involved 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 involves 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 sections of curb and gutter and installing new signage and pavement striping. Crews will also resurface the on- and off-ramps at the Seibert and Stratton interchanges on I-70 with a new hot-mix asphalt overlay. Full ramp closures will be required during paving operations. These improvements will enhance safety and mobility and reduce long-term maintenance needs 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

  I-70 Seibert CO 57 Stratton

Project Facts

• Construction Cost: $31 million
• Contractor: Volkert, Inc.
• Timeline: April 2026 to October 2027
  • Winter shutdown is anticipated between November 2026 to April 2027
• Location: CO 57 and I-70 
  • Nearest Towns/Cities: Seibert and Stratton
  • Mile Point(s): I-70 (MP 401 to 408.5) and CO 57 (MP 0 to 0.5)
  • County: Kit Carson

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 after sunrise and ending 30 minutes before sunset
• Sunday work may occur to keep the project on schedule
• 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 408.5) during the period of construction:

• I-70 traffic will shift from westbound to eastbound in a 24/7 head-to-head traffic configuration
  • One lane of traffic in each direction will be maintained on eastbound I-70
• Watch for construction vehicles periodically pacing head-to-head traffic on eastbound and/or westbound I-70
• Use caution when entering and exiting the head-to-head traffic configuration and on- and off-ramps
• Narrowed lanes and changing traffic patterns through the work zone
• Vehicles wider than 11 feet should plan an alternate route
• 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

I-70 and Stratton Ramp Closures

• Friday, Nov. 6, and Saturday, Nov. 7: The westbound I-70 on-ramp and eastbound I-70 off-ramp
• Monday, Nov. 9, and Tuesday, Nov. 10: The westbound I-70 off-ramp and eastbound I-70 on-ramp
• Ramps will be closed during daytime hours for approximately 6 hours
• Motorists will be unable to enter or exit I-70 using the affected ramps during these closures and should follow the detour routes below
  • Eastbound I-70 Ramps Detours:
    • To Stratton: Exit eastbound I-70 at Vona (Exit 412). Travel north on County Road 23 to US 24, then turn east continuing approximately seven miles to Stratton
    • From Stratton to eastbound I-70: Travel east on US 24 approximately 10 miles to Bethune, turn south on CR 40 following signs to eastbound I-70 (Exit 429)
  • Westbound I-70 Ramps Detours:
    • To Stratton: Exit westbound I-70 at Bethune (Exit 429). Travel north on CR 40 to US 24, turn west and continue approximately 10 miles to Stratton
    • From Stratton to westbound I-70: Travel west on US 24 approximately seven miles to Vona, turn south on CR 23 following signs to westbound I-70 (Exit 412)

Stratton Roadway Improvements

Motorists can anticipate the following traffic impacts along CO 57 (Colorado Avenue) in the Town of Stratton between the I-70 and CO 57 Interchange and US 24:

• Alternating and single-lane closures for milling and paving operations • Traffic holds of up to 15 minutes at roadway approaches during construction activities
• A 12-foot width restriction will be in place
• Watch for construction vehicles entering and exiting the work area
• Refer to COtrip.org for real-time travel conditions and road closures