FILE - This Nov. 19, 2012 file photo shows the high-flow release of water into the Colorado River from bypass tubes at Glen Canyon Dam in Page, Ariz. An advocacy group is calling the Colorado River the nation's most endangered waterway. An annual American Rivers report being released Wednesday April 17, 2013, doesn't call pollution the problem. It instead cites drought and demand.  (AP Photo/The Arizona Republic, Rob Schumacher, file)  MARICOPA COUNTY OUT; MAGS OUT; NO SALES
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