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OROVILLE, CA - FEBRUARY 17: In this handout provided by the California Department of Water Resources (pixel.water.ca.gov), A long line of concrete trucks wait on the top of Oroville Dam to deliver concrete for the erosion repair work at the base of the Oroville Dam emergency spillway on February 17, 2017 in Oroville, California. Last weekend overflow waters from the emergency spillway eroded much of the area below the spillway. The California Department of Water Resources continues to examine and repair the erosion with more than 125 construction crews working around the clock, and placing 1,200 tons of material on the spillway per hour using helicopters and heavy construction equipment at the Butte County site. (Photo by Brian Baer/ California Department of Water Resources via Getty Images)

OROVILLE, CA - FEBRUARY 17:  In this handout provided by the California Department of Water Resources (pixel.water.ca.gov), A long line of concrete trucks wait on the top of Oroville Dam to deliver concrete for the erosion repair work at the base of the Oroville Dam emergency spillway on February 17, 2017 in Oroville, California. Last weekend overflow waters from the emergency spillway eroded much of the area below the spillway. The California Department of Water Resources continues to examine and repair the erosion with more than 125 construction crews working around the clock, and placing 1,200 tons of material on the spillway per hour using helicopters and heavy construction equipment at the Butte County site.  (Photo by Brian Baer/ California Department of Water Resources via Getty Images)