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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...

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...

Naugatuck, river, United States

(Encyclopedia)Naugatuck, river, 65 mi (105 km) long, rising in NW Conn. and flowing S, past Waterbury, to the Housatonic River at Derby. It furnishes water power for the remaining industrial plants along its shores...

Ogden, river, United States

(Encyclopedia)Ogden, river, 35 mi (56 km) long, rising in the Wasatch Range in N Utah, and flowing SW to join the Weber River at Ogden. The river has been used for irrigation for nearly a century. The Ogden–Brigh...

Ohio, river, United States

(Encyclopedia)Ohio, river, 981 mi (1,579 km) long, formed by the confluence of the Allegheny and Monongahela rivers in SW Pa., at Pittsburgh; it flows northwest, then generally southwest to enter the Mississippi Ri...

Osage, river, United States

(Encyclopedia)Osage, river, c.360 mi (580 km) long, formed by the confluence of the Marais des Cygnes and the Little Osage rivers, W Mo. It flows NE to join the Missouri River near Jefferson City. Bagnell Dam (comp...

Oswego, river, United States

(Encyclopedia)Oswego, river, 23 mi (37 km) long, formed by the confluence of the Oneida and the Seneca rivers, central N.Y., NW of Syracuse and flowing NW to Lake Ontario at Oswego. It has been canalized and incorp...

Pecos, river, United States

(Encyclopedia)Pecos, river, 926 mi (1,480 km) long, rising in N N.Mex. near the Truchas peaks and flowing SE across E N.Mex. and W Tex. to the Rio Grande; drains c.38,300 sq mi (99,200 sq km). In New Mexico, dams a...

Penobscot, river, United States

(Encyclopedia)Penobscot pənŏbˈskŏt [key], river, 350 mi (563 km) long, rising in numerous lakes in central Maine and flowing generally east in four branches, uniting, then flowing S into Penobscot Bay; longest ...