"We have up to 60 to 75 cars involved," Sullivan said.
At least 16 people with broken bones, bruises, and scrapes were taken to Vail Valley Medical Center, said hospital spokesman Don Bishop. All were in fair condition except one, who was to undergo surgery.
Six people were taken to a hospital in Breckenridge, where two were in critical condition.
People stranded but not injured in the wrecks were bused to nearby towns and interviewed, Sullivan said.