Blasting begins ahead of I-70 tunnel expansion

IDAHO SPRINGS, Colo. - Construction crews began blasting work Tuesday by the Twin Tunnels on Interstate 70 outside of Idaho Springs.

The blasting will remove some rock outcroppings in preparation for a project to expand the eastbound Twin Tunnel that's scheduled to being on April 1, said the Colorado Department of Transportation.

Contractors are preparing for an I-70 detour that will accompany the tunnel expansion.

Meanwhile, traffic on I-70 traffic near the tunnels will be occasionally halted -- one or two times per week -- for about 20 minutes while preparatory blasting is done leading up to the start of the tunnel project, CDOT said.

For updated project information, call the CDOT information hotline at 303-327-4034, or visit the project website at

For current road and weather conditions you can also call 511, visit, text CDOT to 25827 or download the CDOT smartphone mobile application from your App store.

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