What is the longest free flowing river in the United States?

Cutting a diagonal northeast channel across Montana for nearly 700 miles to its confluence with the Missouri River in North Dakota, the Yellowstone River is the longest free-flowing river in the lower 48 states.



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The Missouri River is the longest river in the United States. Rising in the Eastern Centennial Mountains of the Bitteroot Range of the Rocky Mountains of Southwestern Montana, the Missouri flows east and south for 2,341 miles before entering the Mississippi River north of St. Louis, Missouri.



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Length. The Mississippi River is the second longest river in North America, flowing 2,350 miles from its source at Lake Itasca through the center of the continental United States to the Gulf of Mexico. The Missouri River, a tributary of the Mississippi River, is about 100 miles longer.

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A conservation group says pollution and climate change are among the pressures on rivers. A stretch of the Colorado River that flows through Grand Canyon National Park is the most endangered river.

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The New River is unique among North Carolina rivers for several reasons. It is one of the few major rivers in the continental United States to flow north. Other major rivers that flow northward include the Bighorn River in Montana or the Red River of the North in Minnesota.

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The upper Wisconsin River has been called the hardest working river in the nation, a title well deserved. It contains 26 hydroelectric dams with 21 storage reservoirs, more than any other stretch of river in the United States.

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The Congo is the deepest river in the world. Its headwaters are in the north-east of Zambia, between Lake Tanganyika and Lake Nyasa (Malawi), 1760 metres above sea level; it flows into the Atlantic Ocean.

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The Encyclopedia Britannica gives the length of the Nile as 6,650 kilometers (4,132 miles), to 6,400 kilometers (3,977 miles) for the Amazon, measuring the latter from the headwaters of the Apurimac river in southern Peru.

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The Finke River, which is also called Larapinta by the Aboriginal People, in central Australia is believed to be the oldest river in the world. While the Finke River's exact age is unknown, it is at least over 300 million years old and some of the oldest parts of the river may be over 340 million years old.

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Stretches of the Mississippi River within the park corridor exceed water quality standards for mercury, bacteria, sediment, PCBs (polychlorinated biphenyl), and nutrients. Unfortunately, these impairments can make the water unsuitable for fishing, swimming, and drinking.

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