America's Ten Most Endangered Rivers, 2012

Updated February 21, 2017 | Factmonster Staff

Each year the organization American Rivers analyzes the condition of the nation's rivers to determine which are the most “endangered.” Threats to these rivers include dams and channelizations that are harmful to fish or wildlife populations; depletion due to the rivers' use as a water supply for human populations; and coal mining operations that fill streams with coal and dirt. For more information, refer to the American Rivers website:


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1.Potomac RiverMaryland, Virginia, Pennsylvania, West Virginia, D.C.
2.Green RiverWyoming, Utah, Colorado
3.Chattahoochee RiverGeorgia
4.Missouri RiverIowa, Kansas, Minnesota, Missouri, Montana, Nebraska, North Dakota, South Dakota, Wyoming
5.Hoback RiverWyoming
6.Grand RiverOhio
7.South Forth Skykomish RiverWashington
8.Crystal RiverColorado
9.Coal RiverWest Virginia
10.Kansas RiverKansas
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