description Missouri River Overview
The Missouri River is a major river of the central United States and the longest river in North America, flowing for about 2,300 miles before joining the Mississippi River near St. Louis, Missouri. It begins at the confluence of the Jefferson, Madison, and Gallatin rivers in Montana and drains a vast portion of the Great Plains. The river has long supported Indigenous communities, exploration, transport, agriculture, hydroelectric power, and municipal water use.
help Missouri River FAQ
Where does the Missouri River begin?
The Missouri River begins at the confluence of the Jefferson, Madison, and Gallatin rivers in southwestern Montana. From this point, it flows eastward and then southeastward across the Great Plains.
Is the Missouri River longer than the Mississippi River?
Yes, the Missouri River is actually the longest river in North America, stretching for about 2,300 miles. It is considered a tributary of the Mississippi River, which it joins just north of St. Louis, Missouri.
What role did the Missouri River play in the Lewis and Clark Expedition?
The Missouri River served as the primary route for explorers Meriwether Lewis and William Clark during their famous expedition to the Pacific Northwest in the early 1800s. They traveled up the river from St. Louis, relying on it to navigate the vast, unmapped Louisiana Purchase.
Can you build a dam on the Missouri River?
Yes, the river is heavily dammed along its course, most notably by the massive Fort Peck Dam in Montana. These dams were built primarily for flood control, hydroelectric power, and irrigation as part of the Pick-Sloan Plan.
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