AP Photo
File - In this Oct. 19, 2017 file photo, crews work to repair the damaged main spillway of the Oroville Dam in Oroville, Calif. National dam safety experts say long-term and systemic failures by officials in California and elsewhere caused last year's near-disaster at the nation's tallest dam. The report released Friday, Jan. 5, 2018, comes from experts appointed to investigate the causes of spillway collapses at California's Oroville Dam.(AP Photo/Rich Pedroncelli, File)