I-70 Structure Replacement West of EJMT

Work this Week

Week of May 23
  • The long-term right-lane closure along westbound I-70 from the Eisenhower-Johnson Memorial Tunnel through the project site will remain in place until the winter season shutdown in Fall 2021.
  • The I-70 Mountain Corridor between Denver and Grand Junction will have a busy construction season this spring and summer as CDOT is making numerous improvements to the corridor.
  • Visit the I-70 Mountain Corridor project page for an overview and information on all of the projects.

About the Project:

In March 2020, the Colorado Department of Transportation began design for the replacement of a structure located on a private access road which crosses under Interstate 70 at Mile Post 211, 2.6 miles west of the Eisenhower Johnson Memorial Tunnels in Summit County. The structure, also known as “The Box," is used as a turnaround for CDOT maintenance and emergency first responders. 

Project Facts

  • Contractor: Kraemer
  • Timeline: April 2021 - December 2022
  • Location: I-70 west of EJMT (MP 211)

The existing structure, a single-lane concrete box culvert, was built in the late 1960s during the original construction of I-70. It is currently in poor condition and considered functionally obsolete due to insufficient vertical clearance.

The scope for this project includes removal and replacement of the current structure, reconstructing approximately 1,900 feet of the access road at the roadway approaches, shifting westbound I-70 lanes south as needed for construction phasing, erosion control, and drainage improvements.

The underpass will be widened to 36 feet, which will accommodate two-way traffic and improve the turning radius once construction is complete.

I-70 Structure Replacement Project Map


  • Design: March 2020 – February 2021
  • Estimated Construction: April 2021 – Summer 2022, with a winter shutdown occurring from November 2021 to May 2022

Anticipated Traffic Impacts

  • Reduced speed limit on I-70 from 60 mph to 50 mph.
  • Westbound I-70: Two travel lanes, with the third lane coming out of the tunnel closed during construction. It will reopen during the winter shutdown.
  • Eastbound I-70: Three lanes will remain open during construction.
  • I-70 lane closures in both directions for construction activity will occur during non-peak travel times.
  • Full closure of the current single-lane concrete box culvert structure on the access road for construction from May 1 to November 1, 2021. Westbound I-70 detour will take 19 minutes to circle back to MP 211 and eastbound I-70 will take 8 minutes to circle back to MP 211.
  • Runaway truck ramps on westbound I-70 at MP 212 and MP 209 will remain open during construction.
  • Travel lanes and shoulders widths will vary during construction.

I-70 Structure Replacement Project lane closure illustration