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Photo Gallery | LIST: Study Names Top 10 Most Endangered Rivers in America

A recent study done by, American Rivers, the leading river conservation organization, reported that the Potomac River is the most endangered river in the country.

While the Potomac is cleaner than it used to be thanks to the Clean Water Act that celebrates its 40th anniversary in 2012, the river is still threatened by urban and agricultural pollution.

Check out all ten endangered rivers from the annual America’s Most Endangered Rivers list.