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I-70 Westbound Twin Tunnels (Veterans Memorial Tunnels)

In march of this year the Colorado State Legislature proposed a bill to rename the I-70 Twin Tunnels to Veterans Memorial Tunnels. This bill was passed in April and as of the conclusion of this project, the Twin Tunnels will officially switch names. Until that time, CDOT will continue to use both Twin Tunnels and Veterans Memorial Tunnels when discussing this project so as not to create confusion.

Stay Informed

CDOT to host Telephone Town Hall Meeting on I-70 Mountain Corridor Projects

To keep residents who live and work in the area informed about the Peak Period Shoulder Lane and other active construction projects in the I-70 Mountain Corridor (e.g., Twin Tunnels), community members are invited to join a corridor-wide Telephone Town Hall by calling 877-229-8493 and entering 112034on Wednesday, Oct. 15, 2014 at 7 p.m. Participants will have numerous opportunities to ask questions and hear from CDOT and key project representatives.

Click here to listen to the recording of the March 13 telephone town hall call.

Project Description

The Westbound I-70 Twin Tunnels project will widen the westbound bore of the tunnel in Idaho Springs to about 53-feet. This will accommodate a third lane along westbound I-70 when the highway is eventually widened. Unlike the recent work done along eastbound I-70 to add a third highway lane from Idaho Springs to the bottom of Floyd Hill, this project will only widen the tunnel to accommodate a future third lane. It does not include expanding westbound I-70 to three lanes at this time.

Construction Updates

There will be no lane closures on Friday, April 4, Saturday, April 5 or Sunday, April 6 for the I-70 Twin Tunnels project.

Construction updates can be found in the Travel Alerts or Road Work Alerts at so you can plan your trips accordingly in this area, delays are expected!

Blasting work inside the tunnel and on the rock face wall above the west end of the tunnel is complete. Blasting work on the rock face wall above the east side of the tunnel, however, is expected to continue through September so motorists should still plan for delays.

Tunnel widening work is on schedule for completion by the end of this year. Work will continue in 2015 to restore County Road 314, build retaining walls and make trailhead enhancements. This work is scheduled to be done in the summer of 2015.

Traffic Impacts

  • Eastbound I-70 traffic has been moved back onto the detour route around the tunnel and westbound has been placed in the eastbound tunnel.
  • There will be minor blasting activity that will require stopping traffic in both directions for about 15 minutes.
  • There will be rock scaling work done to remove large rocks from the mountain face above the highway. This work will require stopping traffic in both directions for up to 30 minutes.

Project benefits

  • Doing this project now saves an estimated $5 million to $7 million because the equipment, resources and detour needed to do the work are already in place.
  • With a wider, brighter tunnel entrance, the traffic flow on westbound I-70   will improve as motorists will be less likely to slow down when approaching the tunnel.
  • Driver safety will also improve with the removal of rock from the walls above the tunnel portals and along the north side of the highway along the outside each portal.
  • This project sets the stage for future westbound I-70 improvements which may use the extra lane for general purpose travel, peak period travel and/or transit.

Project Links

Current lane closures

Traffic cameras

Project Schedule

I-70 Mountain Corridor

Twin Tunnels Newsletters

Contact Us

Project Hotline: 303-327-4034

You may leave a message for a project representative at the end of the recording. Please leave your name, number, and a brief message.

Public Relations Team:
Nadia Garas

Joy Wasendorf

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