A helicopter prepares to latch a bag of rock and material for delivery to the base of the Oroville Dam to repair damage to the spillway and hillside February 17, 2017 in Oroville, California. Repairs continue on the spillway and water is being released from the lake to reduce the risk of failure at the nation's tallest dam. (Brian Baer/California DWR via Planetpix)

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Keywords: california, dam, day, disaster, dwr, embankment, emergency, engineering, erosion, evacuation, failure, feather, helicopter, horizontal, hydropower, infrastructure, lake, landmark, natural, oroville, outdoors, repairs, reservoir, resource, river, spillway, tallest, water