Choppers move in as rock-filled bags await positioning on Oroville Dam spillway

Helicopters approach a staging area where bags filled with crushed rock await their placement on the damaged emergency spillway of Oroville Dam on Monday, Feb. 13, 2017.
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Helicopters approach a staging area where bags filled with crushed rock await their placement on the damaged emergency spillway of Oroville Dam on Monday, Feb. 13, 2017.