I-70 Eastbound Twin Tunnels (Completed)

Twin Tunnels - CurrentProject Background

The Twin Tunnels Design and Construction Project was created to alleviate congestion along the I-70 Mountain Corridor. The project included work to expand eastbound I-70 from Floyd Hill to Idaho Springs, including the eastbound side of the Twin Tunnels. In addition, the project called for the reconstruction of the bridge over Clear Creek in order to diminish the curve at Hidden Valley.

View the project animation

View the Environmental Assessment for more information on project design and environmental impacts

View the project fact sheet

Listen to 12/20/2012 and 03/07/2013 Interviews about the Project

Construction Activity

Work is now complete, there are three lanes from east Idaho Springs to the bottom of Floyd Hill and eastbound I-70 will begin moving through the widened tunnel. It is estimated that adding a third lane to eastbound I-70 will save Sunday travelers about $11.4 million in travel time and fuel costs in 2014. Read the FAQs about this work.

View the detour animation (109MB)

View current lane closures

View traffic cameras

Widening the Eastbound Tunnel

State-of-the-art blasting techniques were used to widen the eastbound tunnel. To view videos of the blasting operations and listen to a series of radio programs, click here.