I-70 Twin Tunnels
The Twin Tunnels Design and Construction Project was created to alleviate congestion along the I-70 Mountain Corridor. The project includes work to expand eastbound I-70 from Floyd Hill to Idaho Springs, including the eastbound side of the Twin Tunnels. In addition, the project calls for the reconstruction of the bridge over Clear Creek in order to diminish the curve at Hidden Valley.
Upcoming Construction Activity
Eastbound I-70 will be reduced to one lane of travel near Idaho Springs Tuesday, Dec. 10, through Thursday, Dec. 12, while the eastbound lanes are reconstructed. During this time crews will remove the existing pavement, install drainage lines, reconstruct the roadway on both sides of the tunnel and install guardrail and barrier.
Once this work is complete, there will be 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)
Widening the Eastbound Tunnel
State-of-the-art blasting techniques will be used to widen the eastbound tunnel. Once blasting begins, four to six sequences will take place each day stopping traffic for 20-30 minutes each period. Blasting sessions will not take place during high volume traffic periods.
To view videos of the blasting operations and listen to a series of radio programs, click here.
Beginning April 1, 2013, all lanes of eastbound I-70 will be detoured to County Road 314 which parallels the interstate. Two lanes will remain open 24/7 through late 2013 for blasting operations in the eastbound tunnel. Traffic will merge with I-70 just west of the Hidden Valley exit.
Call 303-327-4034 for the daily traffic impacts. The recording is updated by 10 a.m. daily.
Coping with Construction
During construction, motorists are encouraged to keep coming to the mountains for recreation, shopping and dining. Travelers will be able to get to and from their destination during construction. CDOT has committed to maintain two lanes of traffic in each direction during high volume traffic periods; and restrict lane closures and blasting operations to low volume travel times, such as week days and overnight.
Filed under: Project: I-70 Twin Tunnels