In this photo taken Oct. 7, 2009, California Department of Water Resources crews do maintenance repairs on the Oroville Dam spillway in Oroville, Calif. Six months before rushing water scoured a huge hole in a channel that drains a Northern California reservoir, state inspectors said the concrete spillway was sound. In recent years, construction crews patched cracks - including in the area where water burrowed a huge pit - and a state inspector called the repairs “sound” in his February 2015 report. (Barbara Arrigoni/The Chico Enterprise-Record via AP)
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