In this Saturday, Feb. 11, 2017, water flows down Oroville Dam's main spillway near Oroville, Calif. Water began flowing over the emergency spillway at the Oroville Dam on Saturday for the first time in its nearly 50-year history after heavy rainfall. In addition to the emergency spillway, water also flowed through the main spillway that was significantly damaged from erosion. Officials said they'll assess the damage starting Monday. (AP Photo/Rich Pedroncelli)