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The longest river in the United States is the Missouri River at 2,540 miles.

en.wikipedia.org/wiki/List_of_longest_rivers_of_the_United_States_(by_main_stem)

The main stems of 38 rivers in the United States are at least 500 miles (800 km) long. The main stem is "the primary downstream segment of a river, as contrasted ... Three—the Milk and Saint Lawrence rivers and the Red River of the North— begin in the United States and flow into Canada. ..... North Dakotas, South Dakotam.

en.wikipedia.org/wiki/List_of_longest_undammed_rivers

This is a list of the longest undammed rivers of the world, ordered by length. This list is incomplete; you can help by expanding it. This incomplete list is frequently updated to include new information. Continent color key. Africa, Asia, Europe, North America, Oceania, South America ... Tajikistan is planning to build a hydroelectric dam on the Panj River.

www.answers.com/Q/What_is_the_longest_north_south_river_in_the_United_states

The Mississippi River is the longest north-south running river in the United States. Is is also the fourth longest river in the entire world.

en.wikipedia.org/wiki/List_of_longest_rivers_in_the_United_States_by_state

This is a list of longest rivers in the United States by state. It includes rivers that pass through ... The longest river entirely within California is the Sacramento River. ... Cimarron River – 698 miles (1,123 km); Smoky Hill River – 560 miles ( 900 km); South Platte River – 439 miles (707 ..... See also List of rivers of North Carolina.

www.quora.com/What-are-the-longest-rivers-in-North-America-and-where-are-they-located

The longest river in North America is the river that flows into the Gulf of Mexico just south of New Orleans. At this point, and for hundreds of ...

phys.org/news/2015-06-longest-rivers-world.html

Jun 4, 2015 ... The Amazon River is the longest river in South America, and the largest ... However, the main thrust of the Mississippi runs north-south, rising in ...

www.worldatlas.com/webimage/countrys/nariv2.htm

Nov 17, 2015 ... It is the major river of North America and the United States at (2,339 miles) ... It flows from northwestern Minnesota south to the Gulf of Mexico, just ... (the Missouri and Ohio rivers) it becomes the third largest river system in the ...

pubs.usgs.gov/of/1987/ofr87-242

Sep 1, 2005 ... It is common knowledge that the Mississippi is the largest U.S. river, but what is ... five times before becoming Mobile River 45 miles north of Mobile Bay. ... such as the Mississippi River south of Cairo, Ill., undergo significant ...

www.adducation.info/earth-general-knowledge/longest-rivers-in-usa

List of 25 Longest Rivers in USA & United States + Canada, Mexico, North ... North Dakota, Missouri River at Yankton County near Yankton, South Dakota, North ...