Workers blast through I-70 Twin Tunnels

IDAHO SPRINGS, Colo. - The last big blast of the Twin Tunnels widening project on Interstate 70 near Idaho Springs broke through to daylight Monday, signaling the start of a new phase of the $106 million project, the Denver Post reported.

Since April 19, crews have set 70 charges -- about six per week -- to move about 19,700 cubic yards of rock from the 635-foot-long tunnel, Colorado Department of Transportation spokeswoman Amy Ford said.

Rock blasting was one of the first key phases of the project, which includes expanding the eastbound bore of the tunnels and will add an eastbound lane between East Idaho Springs and U.S. 6.

Crews will reconstruct the eastbound I-70 bridge over Clear Creek to help flatten the curve at Hidden Valley, Ford said.

Improving the Twin Tunnels area is one of several efforts CDOT will take in the next several years to cut travel time and accidents on I-70, which sees heavy traffic flows, especially on weekends.

Learn more about the project in the Denver Post: