What is the cleanest urban river in the US?

Charles River, Boston Bostonians can thank the Charles River Conservancy, which launched the Swimmable Charles Initiative in 2004, for reclaiming public access to the formerly Dirty Water. The Conservancy claims that the river is now one of the cleanest urban rivers in the United States.



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The Mississippi River This once pristine waterway is perhaps the most polluted in the United States. Part of the problem stems from agriculture. The Mississippi River traverses much of America's heartland, drawing no end of runoff from factory farms. Animal waste isn't the only problem.

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The 5 Most Polluted Rivers in the US
  • The Ohio River. Manufacturers design steel-hulled boats to last for 20 years or more. ...
  • New River. The trouble at the U.S. southern border involves more than immigration. ...
  • The Mississippi River. ...
  • The Cuyahoga River. ...
  • The Delaware River.


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Lake Tahoe, California/Nevada The crystal-clear waters of Lake Tahoe reach a maximum depth of 1,645 feet at a height of 6,225 feet above sea level. The water of this long-existent lake is the cleanest in North America, making it one of the cleanest lakes in the United States.

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The Thames is considered to be the cleanest river in the world that flows through a major city. The Thames is home to 125 species of fish and more than 400 invertebrates.

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According to The Guardian, the Citarum River in Indonesia is so polluted that before you see it, you will smell it.

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Long Beach, California Global Traveler talks about what makes this Cali city rank highly in the clean category: “Travel insurance comparison site InsureMyTrip ranked the best and worst U.S. cities for cleanliness, and Long Beach, California, is No. 1, rated the cleanest U.S. city.

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One reason is that 40 percent of the precipitation falling into the Lake Tahoe Basin falls directly upon the Lake. Much of the remaining precipitation drains through marshes and meadows, which are an effective filtration system that remove fine particles before water enters the Lake.

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Surveys in 1957 found the river was unable to sustain life, and the River Thames was eventually declared “biologically dead”.

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1. Blue Hole – Santa Rosa, New Mexico.

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