FILE - In this Feb. 9, 2017 file photo, water flows through a break in the wall of the Oroville Dam spillway in Oroville, Calif. One year after the closest thing to disaster at a major U.S. dam in a generation, federal dam regulators say they are looking hard at how they overlooked the built-in weaknesses of old dams like California's Oroville Dam for decades, and expect dam managers around the country to study their old dams and organizations equally hard. (AP Photo/Rich Pedroncelli, file)
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