Rock Island Dam
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Juvenile tagged salmon are released into the Columbia River below Rock Island Dam near Rock Island, Wash., on Tuesday, May 6, 2014. Grant County PUD is using a helicopter to reduce the time it takes to transport the fish and release them in the center of the river to track their movements through Wanapum and Priest Rapids dams. (AP Photo/The Wenatchee World, Mike Bonnicksen)

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Juvenile tagged salmon are released into the Columbia River below Rock Island Dam near Rock Island, Wash., on Tuesday, May 6, 2014. Grant County PUD is using a helicopter to reduce the time it takes to transport the fish and release them in the center of the river to track their movements through Wanapum and Priest Rapids dams. (AP Photo/The Wenatchee World, Mike Bonnicksen)