America's Ten Most Endangered Rivers, 2006

Updated April 12, 2022 | Infoplease 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: .

Rank River State(s)
1. Pajaro River Calif.
2. Upper Yellowstone River Mont.
3. Willamette River Ore.
4. Salmon Trout River Mich.
5. Shenandoah River Va., W. Va.
6. Boise River Idaho
7. Caloosahatchee River Fla.
8. Bristol Bay Ark.
9. San Jacinto River Tex.
10. Verde River Ariz.


America's Ten Most Endangered Rivers, 2007 Environment America's 25 Most Ozone-Polluted Metropolitan Areas, 2007


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