Columbia Encyclopedia

(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...

(Encyclopedia)  CE5 Missouri mĭzo͝orˈē, –ə [key], one of the midwestern states of the United States. It is bordered by Illinois, Kentucky, and Tennessee, across the Mississippi River (E), Arkansas (S), Okla...

(Encyclopedia) Mississippi, river, principal river of the United States, c.2,350 mi (3,780 km) long, exceeded in length only by the Missouri, the chief of its numerous tributaries. The combined Missouri-Mississippi ...

(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...

(Encyclopedia) Gallatin, river, c.120 mi (190 km) long, rising in the Gallatin Range in the northwest corner of Yellowstone National Park, NW Wyo., and flowing generally northwest to join the Madison and Jefferson r...

(Encyclopedia) Cheyenne, river, 527 mi (848 km) long, rising in E Wyo. and flowing NE to the Missouri River near Pierre, S.Dak. The Cheyenne basin is part of the Missouri River basin project. The U.S. Bureau of Recl...

(Encyclopedia) Missouri Compromise, 1820–21, measures passed by the U.S. Congress to end the first of a series of crises concerning the extension of slavery. By 1818, Missouri Territory had gained sufficient popul...

(Encyclopedia) Saint Francis, river, c.470 mi (760 km) long, rising in the hills of SE Missouri and flowing S through NE Arkansas to join the Mississippi River near Helena, Ark. The river forms part of the Arkansas�...

(Encyclopedia) Sun, river, c.130 mi (210 km) long, rising in the Rocky Mts., NW Mont., and flowing generally E to the Missouri River at Great Falls. The Sun River project of the U.S. Bureau of Reclamation utilizes t...

(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...