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Missouri, river, United States

(Encyclopedia)Missouri, river, c.2,565 mi (4,130 km) long (including its Jefferson-Beaverhead-Red Rock headstream), the longest river of the United States and the principal tributary of the Mississippi River. The l...

Merrimack, river, United States

(Encyclopedia)Merrimack, river, c.110 mi (180 km) long, formed at Franklin, S central N.H., by the junction of the Pemigewasset (rising in the White Mts.) and Winnipesaukee rivers. It flows S past Concord and Manch...

Mohawk, river, United States

(Encyclopedia)Mohawk, river, c.140 mi (230 km) long, rising in central New York and flowing S then SE past Utica and Schenectady to enter the Hudson River at Cohoes. The Mohawk is canalized from Rome to its mouth (...

Madison, river, United States

(Encyclopedia)Madison, river, 183 mi (295 km) long, rising in Yellowstone National Park, NW Wyo., and flowing W then N through SW Montana to join the Jefferson and Gallatin rivers at the Three Forks of the Missouri...

Kings, river, United States

(Encyclopedia)Kings, river, 125 mi (201 km) long, rising in three forks in the Sierra Nevada, E Calif., and flowing SW to Tulare Lake in the San Joaquin valley. Its middle and southern forks flow through the great ...

Kansas, river, United States

(Encyclopedia)Kansas or Kaw, river, 170 mi (274 km) long, formed by the junction of the Smoky Hill and Republican rivers in NE Kansas and flowing E to the Missouri River at Kansas City; the system drains parts of K...

Kentucky, river, United States

(Encyclopedia)Kentucky, river, 259 mi (417 km) long, formed by the junction of the North Fork and the Middle Fork rivers, central Ky., and flowing NW to the Ohio River at Carrollton. Frankfort, Ky., is the river's ...

Muskegon, river, United States

(Encyclopedia)Muskegon, river, 227 mi (365 km) long, rising in Houghton Lake, N central Mich., and flowing SW to Lake Michigan at Muskegon. At its mouth the river widens into Muskegon Lake, forming a harbor c.2.5 m...

Heart, river, United States

(Encyclopedia)Heart, river, 180 mi (290 km) long, rising in the low prairie country near the Little Missouri River, SW N.Dak., and flowing E to the Missouri at Mandan, N.Dak. The Heart Butte and Dickinson dams, irr...

Hackensack, river, United States

(Encyclopedia)Hackensack, river, c.45 mi (70 km) long, rising in SE N.Y. and flowing S through the Jersey Meadows (or Meadowlands), NE N.J., to Newark Bay. The lower Hackensack is heavily industrialized (and pollut...