More than 100,000 people fled their homes in northern California on Sunday as an emergency spillway next to America's tallest dam threatened to collapse and unleash what authorities called a catastrophic amount of water along the Feather River.
While the evacuation took place, emergency repairs were performed on the spillway at the 770-foot Oroville Dam, with helicopters dropping rock-filled containers, the San Francisco Chronicle reports.
The cities of Oroville, Yuba City, and Marysville were among those under mandatory evacuation orders. Saturday, when a hole developed in the main spillway, was the first time the emergency spillway was used since the dam was completed in 1968. Authorities say the dam itself remains structurally sound, reports the Los Angeles Times.