FILE - In this Feb. 28, 2017, file photo, construction crews clear rocks away from Oroville Dam's crippled spillway in Oroville, Calif. The sudden collapse of spillways at the nation's highest dam was unique because it came without warning, and the investigation into why that was is sure to change the way big dams are built and run around the world, an independent team searching for explanations into this winter's near-disaster at Oroville Dam says. (AP Photo/Rich Pedroncelli, File)
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