After discovering a hole in Oroville Dam's emergency spillway, officials said late Sunday that they will attempt to plug it using sandbags and rocks. But they stressed the situation remains dangerous and urged thousands of residents downstream to evacuate to higher ground.
Video from television helicopters Sunday evening showed water flowing into a parking lot next to the dam, with large flows going down both the damaged main spillway and the emergency spillway.
They also showed lines of cars getting out of downtown Oroville. An evacuation center was set up at the Silver Dollar Fairgrounds in Chico.