Highway workers are using a helicopter today to drop equipment on a mountainside in efforts to dislodge a boulder that's threatening Interstate 70 through Glenwood Canyon.

The helicopter dropped off drilling equipment and a generator late this morning so a crew can drill, and then blast, a 20-foot wide slab of rock that threatens the highway below.

Mindy Crane, a spokeswoman with the Colorado Department of Transportation, said the crew hopes to have the rock cleared sometime early this afternoon. If the rock blast goes well, workers should be able to start clearing eastbound lanes of the highway in preparation of a limited re-opening. A time estimate on such a partial re-opening has not been released.

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