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

I-70 Glenwood Canyon Surface Improvements crews completed an important project milestone and reopened the Westbound on-ramp from the Grizzly Creek Rest Area to Interstate 70 on Friday, June 19. The head-to-head detour remains in effect Mondays through Thursdays and Fridays until 1 p.m.

The milestone progress marks the completion of deck repairs and paving of the Westbound deck at Hanging Lake and between Grizzly Creek and No Name. Crews have also completed improvements of ADA ramps at the canyon rest areas.

With the Westbound on-ramp from the Grizzly Creek reopening, visitors to the Grizzly Creek Rest Area and to Shoshone no longer have to use the Bair Ranch detour for Westbound access.

In a continued effort to minimize traffic impacts to the traveling public, after 1 p.m. on Fridays and on Saturdays and Sundays, there will be no head-to-head detour. Westbound traffic will be routed in a single lane on the Westbound deck and Eastbound traffic will be routed in a single lane on the Eastbound deck. This will allow for direct Westbound access to and from Grizzly Creek and No Name, and from Shoshone and Hanging Lake.
In the lane closures on each of the traffic decks, workers and construction vehicles may be present or the lane may be empty. Keeping the lane closure up on the weekends will allow for construction access and will simplify traffic control transitions.

Delay times will vary depending on travel volumes in the canyon. Plan extra travel time, especially morning and evening peak hours and on the weekends. To hear approximate travel times, call the project information line: 970-618-5379.

Remember to go slow for the cone zone and to always give your full attention to the road. Motorists should use both lanes to the merge point, also called a zipper merge. Please be aware of posted speed limits throughout work zones, to keep both fellow motorists and crews safe.

GC7 June 19 to Early-Sept Map.png

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.

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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