Potomac tops conservation group's list of endangered rivers

May 21st, 2012 By Russell McLendon in Earth / Environment

The Potomac River is much healthier today than it was 40 years ago, when its chemical-laced, sewage-laden waters helped inspire the 1972 Clean Water Act. But the Washington waterway still has a long way to go, as suggested by its No. 1 ranking in a new list of America's most endangered rivers.

The list, released annually by American , doesn't necessarily name the country's 10 most polluted rivers. As American Rivers explains on its website, it selects the most at-risk rivers each year based on three criteria:

-A major decision in the coming year that the public can help influence.

-The significance of the river to human and natural communities.

-The magnitude of threats to the river and associated communities.

The significance of the Potomac is hard to miss: It's nicknamed "the nation's river" because it flows through the U.S. capital, and it supplies drinking water to 5 million people in four states and the District of Columbia. It has been on American Rivers' list before, but made the top spot in 2012 to highlighting efforts in Congress that could weaken the . Because that law helped save the Potomac from rampant pollution in the past century - and because the Potomac has national symbolic value - American Rivers says it's "emblematic of what's at stake for rivers nationwide."

"When fill a glass of water or drink their morning coffee, that water comes from the Potomac River," American Rivers president Bob Irvin said in a news release. "It's time to draw clear connections between healthy rivers, and public health in Washington, D.C., and in communities nationwide."

American Rivers isn't the only one pointing out the Potomac's problems. In its annual report card on the ecosystem, the University of Maryland gave the river a "D" the past two years, down from a "C" in 2009. The 2011 report cited "declines in and benthic community" for the low grade. While the Potomac was threatened in the past by raw and industrial dumping, it faces subtler threats today, such as toxic runoff from farms, cities and mines.

"Thanks to the Act, you no longer see and smell most of the problems in the watershed, and no president is currently calling the Potomac a 'national disgrace,'" Ed Merrifield, president of Potomac Riverkeeper, said in a prepared statement. "But the hidden problems are many and in some ways worse than when the problems were palpable. ... The urban, suburban and agricultural stormwater runoff causes serious problems throughout the watershed, at times impairing the use of the river. The past fish kills and pervasive intersex fish issues due to the 'chemical soup' the fish swim in have made national headlines for years."

For the other nine rivers on the list, threats include new dams and reservoirs, dredging plans, coal mining and natural gas development.

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America's Most Endangered Rivers, according to American Rivers; the states in which they flow; and the threats they face:

- Potomac River (Maryland, Virginia, Pennsylvania, West Virginia, District of Columbia): pollution

- Green River (Wyoming, Utah, Colorado): water withdrawals

Chattahoochee River (Georgia): new dams and reservoirs

Missouri River (Iowa, Kansas, Missouri, Montana, Nebraska, North Dakota, South Dakota, Wyoming): outdated flood management

Hoback River (Wyoming): natural gas development

Grand River (Ohio): development

South Fork Skykomish River (Washington): new dam

Crystal River (Colorado): dams and diversions

Coal River (West Virginia): mountaintop removal coal mining

Kansas River (Kansas): sand and gravel dredging

More information: © 2012, Mother Nature Network
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"Potomac tops conservation group's list of endangered rivers." May 21st, 2012. http://phys.org/news/2012-05-potomac-tops-group-endangered-rivers.html