Photos: Oroville Dam breaks, causes mass evacuations

This Feb. 11, 2017, photo released by the California Department of Water Resources shows the main spillway, bottom, and an auxiliary spillway, upper, of the Oroville Dam at Lake Oroville in Oroville, Calif.

Lake water flows over the emergency spillway, bottom left, at Lake Oroville for the first time in the nearly 50-year history of the Oroville Dam Saturday, Feb. 11, 2017, in Oroville, Calif.

Water from the Cosumnes and Mokelumne rivers floods a house and barn north of Twin Cities Road east of Interstate 5, Saturday, Feb. 11, 2017 in Elk Grove, Calif.

Water flows over the emergency spillway at Oroville Dam Saturday, Feb. 11, 2017, in Oroville, Calif.