Glenwood Canyon Phase 7 Improvements

Project Facts

Cost: $15.7 million

Contractor: American Civil Constructors West Coast, LLC

Timeline: February - October 2020

Location: I-70 Glenwood Canyon

Phase 7 of Interstate 70 Glenwood Canyon Improvements is underway. Crews are currently preparing for the traffic shift of westbound traffic down to the eastbound driving deck, one lane in each direction, which is scheduled to begin on Friday, April 3, 2020. Motorists should anticipate intermittent stops on I-70 Eastbound and Westbound for detour installation. Delays are anticipated.


View the Glenwood Canyon - Phase 7 Project Map (PDF)

Estimated Construction Timeline and Traffic Impacts: March-October 2020

The project is scheduled to be complete October 2020. To sign up for traffic and trail impact updates, please contact public information via email, [email protected], or phone, 970-618-5379. Read the Estimated construction timeline and traffic impacts (PDF).

Traffic and Trail Impacts

Travel impacts for motorists and trail users will vary throughout the project. For much of the roadwork, motorists should plan for lane closures, reduced speed limits and narrowed roads. Glenwood Canyon trail users may encounter shifting closures of ADA ramps at rest areas throughout the canyon.

Beginning on Thursday, April 2, both Eastbound and Westbound traffic will use the lower (Eastbound) driving deck, with one lane in each direction.

Travel Tips:

  • Delay times will vary depending on travel volumes in the canyon. Plan extra travel time, especially morning and evening peak hours.
  • Please zipper merge by using both lanes to the merge point.
  • Follow posted signage and go slow for the cone zone!

Construction Activities and Site Area

This eight-month improvement project includes resurfacing I-70 with a placement of thin bonded polyester concrete overlay, replacement of bridge joints and bearings, new pavement markings and ADA ramp improvements at rest areas. Construction will occur within approximately 6.2-miles on I-70 in the Glenwood Canyon, from mile post (MP) 116 to MP 133.

Polyester concrete overlay is the primary construction activity for this project. Upgrading this section of roadway will minimize the need for annual repairs as this road surface application is more durable and has a significantly longer lifespan than asphalt. This project will provide an improved driving surface and help ensure the longevity and safety of our infrastructure.

Why is the work being completed? 

  • Improve the safety of the roadway and create a smoother riding surface
  • Increase the lifespan and strength of surface and structures, reducing the number and severity of future projects in this quadrant
  • Continue to provide pedestrian access to the countless recreational opportunities in Glenwood Canyon and infrastructure for guiding services, outfitters, shuttles, etc., providing an opportunity for local revenue and employment
  • Whole System-Whole Safety: completion of Westbound quadrant (No Name Tunnel – Hanging Lake Tunnel)
  • Reduce water seepage and freeze-thaw effects
  • If left untreated, the infrastructure through Glenwood Canyon will continue to deteriorate

Engineering Solutions to Minimize Traffic Impacts 

Contract milestones to reduce stakeholder and river user impacts

Two-way head-to-head detour to improve safety, production and reduce project duration

Proactive incident response and traffic control

Courtesy patrol and heavy tow are being considered to respond to incidents during the two-way (head-to-head) detour


This $15.7 M CDOT contract was awarded to American Civil Constructors West Coast. ACCWC has extensive experience with heavy-civil contracting services for infrastructure projects throughout the United States.

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