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Boise, river, United States

(Encyclopedia)Boise, river, c.160 mi (260 km) long, rising in SW Idaho and flowing west to join the Snake River at the Oregon line. In 1811 the Boise River, originally called Reed's River, was explored by an expedi...

Bighorn, river, United States

(Encyclopedia)Bighorn, river, 461 mi (741 km) long, formed in W central Wyo. by the confluence of the Wind and Pop Agie rivers and flowing north to join the Yellowstone River in S Mont. The Bighorn basin, part of t...

Bitterroot, river, United States

(Encyclopedia)Bitterroot, river, c.120 mi (190 km) long, rising in SW Mont. and flowing north to join the Clark Fork River near Missoula. A Roman Catholic mission was established on the river in 1841, and missionar...

Weber, river, United States

(Encyclopedia)Weber wēˈbər [key], river, c.125 mi (200 km) long, rising in the Uinta Mts., N central Utah, and flowing north and northwest to join the Ogden River at Ogden. The combined stream flows to the Great...

Grand River, rivers, United States

(Encyclopedia)Grand River. 1 River, 260 mi (418 km) long, rising in S Mich. and flowing N to Lansing, then NW to Lake Michigan at Grand Haven. It is the longest river in the state and is navigable to the city of Gr...

Des Moines, river, United States

(Encyclopedia)Des Moines, river, 535 mi (861 km) long, rising in SW Minn. and flowing SE across Iowa to the Mississippi River at Keokuk, SE Iowa. Flowing through fertile farmland, the river floods in the spring and...

Des Plaines, river, United States

(Encyclopedia)Des Plaines, river, 110 mi (177 km) long, rising in SE Wis., and flowing S and SW through NE Ill., joining the Kankakee River S of Joliet, Ill., to form the Illinois River. The lower Des Plaines is pa...

Saint Francis, river, United States

(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 Arkansasâ...

Saint Johns, river, United States

(Encyclopedia)Saint Johns, river, 285 mi (459 km) long, rising in SE Fla., N of Lake Okeechobee, and flowing N to Jacksonville, where it turns abruptly eastward and enters the Atlantic Ocean 28 mi (45 km) away. It ...

Saint Joseph, river, United States

(Encyclopedia)Saint Joseph, river, 210 mi (338 km) long, rising in S Mich. and flowing generally westward in wide curves to Lake Michigan at Benton Harbor, Mich. South Bend, Ind., is on the river, which was an impo...