The rocks, weighing a combined 10 million pounds, plummeted off a cliff some 850 feet above Colorado Highway 145, according to KCNC-TV.
One of the boulders is as large as house, an official with the Colorado Department of Transportation told KUSA-TV.
The rocks destroyed the highway pavement and created a trench 8 feet deep, CDOT said on social media.
The regional transportation director for CDOT in southwest Colorado, Mike McVaugh said repair crews were surprised when they arrived at the scene.
“They sent a plow truck out, they sent a supervisor out. They showed up on-site and they were like, ‘That’s not going to work. We’ve got some really big rocks here,’” McVaugh recounted.
Highway crews are working to repair the road but will have to blast the larger rock into smaller pieces to remove it. Meanwhile, CO 145 between Cortez and Telluride will remain closed.
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