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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

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!

There will be short-term lane closures to finish pouring sections of the concrete median barrier and retaining wall. Additional work to be done in 2015 to finish the project includes restoring County Road 314 and building retaining walls along this roadway, making enhancements to Clear Creek and building an enhance trailhead area alongside the river. This work is scheduled to be done in the summer of 2015.

Traffic Impacts

  • In early December, there could be single lane closures along I-70 for general construction activities to prepare for the traffic shift.
  • The week of December 15, there will be a two-day period when there are various lane closures in both directions of I-70 while traffic is moved back into its normal alignment.
  • While traffic is shifted the week of December 15, there will be about a 12- hour period when the Hidden Valley/Central City Parkway exit from eastbound I-70 (Exit 243) is closed so the right lanes of I-70 can be restriped.
  • After traffic is shifted, there could be occasional single lane closures in the following weeks to finish various non-critical work activities.

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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