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America's Ten Most Endangered Rivers, 2011

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: www.americanrivers.org.

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Rank River Region
1. Susquehanna River Pennsylvania, New York, Maryland
2. Bristol Bay Alaska
3. Roanoke River Virginia, North Carolina
4. Chicago River Illinois
5. Yuba River California
6. Green River Washington
7. Hoback River Wyoming
8. Black Warrior River Alabama
9. St. Croix River Minnesota, Wisconsin
10. Ozark National Scenic Riverways Missouri

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