SONORA, California — Residents living downstream from a popular summer lake in Tuolumne County were warned to watch for flash floods on Sunday after the dam that holds back the lake’s millions of gallons of water sprung leaks, federal and local authorities said.

The operator of Twain Harte Dam reported hearing loud booms and seeing water flowing through breaks in Twain Harte Dam, the National Weather Service said in issuing a flash flood warning for creek-side neighborhoods located southwest of the town of Twain Harte. The dam sits on Twain Harte Lake, a privately owned, man-made lake built in the late 1920s that is 20-to-25 feet deep.

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