GEORGETOWN, Colo. — A 25-mile stretch of Colorado's main east-west highway is open again after being closed since morning while crews removed unstable boulders from a mountainside that were threatening to tumble onto traffic 300 feet below.

State transportation officials say crews were able to remove all the rocks and boulders Tuesday that were considered immediate threats. Some of the boulders on the mountainside along Interstate 70 were as big as pickup trucks. A few houses in the area about 45 miles west of Denver were evacuated as a precaution.

Falling boulders killed two people on I-70 in the area in 1999.

Most of the work is finished, but there will be traffic stops of about 20 minutes Wednesday for clean-up work and a new net to catch falling rocks will be installed over the next two weeks.