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Swimmers jump from the Sternwheeler paddleboat during the Roy Webster Cross Channel Swim Monday, Sept. 5, 2011, near White Salmon, Wash. 475 swimmers jumped into the Columbia River and swam the 1.1-mile stretch across to Hood River, Ore. The Columbia River is the largest river in the Pacific Northwest and the fourth largest river (by volume) in America. (AP Photo/Rick Bowmer)