FILE - In this Nov. 30, 2017, file photo, work continues on the Oroville Dam spillway in Oroville, Calif. A newspaper investigation found that the owners of some of California's most critical dams allow problems identified in annual inspection reports to linger for years. The Sacramento Bee reported Friday, Dec. 8 that unrepaired deficiencies include cracked concrete, rusted equipment, broken sensors and frozen valves. Outside investigators looking into the cause of a catastrophic crater in the spillway at Oroville Dam this year say a drainage system clogged by tree roots likely contributed. (AP Photo/Rich Pedroncelli, File)
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