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Crews work on one of the sidewalls of the damaged main spillway of the Oroville Dam on Thursday, Oct. 19, 2017, in Oroville, Calif. California officials say repair costs at the nation's tallest dam will be nearly double the original estimate of $275 million. The main spillway and emergency spillway suffered significant damage during storms last February, prompting fears of massive flooding. (AP Photo/Rich Pedroncelli)

Oroville Dam repair costs will top $500 million

By JONATHAN J. COOPER - Associated Press

FILE - In this Feb. 14, 2017, file photo, water gushes from the Oroville Dam's main spillway in Oroville, Calif. An independent team of dam experts says bad design and construction a half-century ago contributed to a disastrous spillway collapse at the nation's tallest dam. Dam-safety experts investigating February's spillway failures at the Oroville Dam say California should have assessed the original flaws. (AP Photo/Marcio Jose Sanchez, File)

Poor design, construction blamed in damage to California dam

By ELLEN KNICKMEYER - Associated Press