This June 14, 2017, photo provided by the City of San Luis Obispo shows the Whale Rock reservoir spillway in San Luis Obispo, Calif. California is asking owners of about 70 aging dams, some dating back to the Gold Rush, to thoroughly inspect their spillways and underlying rock, as part of stepped-up inspections in the wake of the surprise spillway failures at the nation's highest dam, the Oroville Dam. (Noah Evans/The City of San Luis Obispo via AP)
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