BOULDER, Colo. (CBS4) – A rock slide in Boulder Canyon Monday morning forced road crews to close part of Highway 119.

The slide is located approximately 12 miles west of Boulder. The closure stretched from Sugarloaf Road to Hurricane Hill. The highway was reopened Monday night.

Authorities said some of the rocks that fell were as big as cars.

The Colorado Department of Transportation said the largest rocks are 11 feet long. They had to be broken into smaller chunks so they could be hauled away.

(credit: CBS)

“The biggest challenge right now for these guys is getting the rocks down to a manageable size and getting them off the road because they’re pretty big for the equipment we have to handle,” a CDOT official said.

(credit: CBS)