Missouri River

The Missouri River flows from the Rocky Mountains of Montana across the Great Plains to the Mississippi River near St. Louis. It is the Mississippi River’s longest tributary and drains a large portion of the central United States.

Mississippi River: A major North American river flowing from Minnesota to the Gulf of Mexico. The Missouri joins it near St. Louis, contributing much of its flow and drainage basin.
Missouri people: An Indigenous people of the central Mississippi River valley, historically associated with the Missouri River region. The river’s name derives from the people and their name for a neighboring group.
Missouri River navigation: Commercial and recreational movement of vessels along the Missouri River. Channel engineering made parts of the river usable for barge transport.
Missouri River flood of 1993: A major flood across the upper Mississippi and Missouri river basins during the summer of 1993. The flood exposed the limits of levees and flood-control systems along the river.
Missouri River Basin: The land area drained by the Missouri River and its tributaries. Its vast basin explains the river’s reach across the Great Plains and Rocky Mountain states.
Lewis and Clark Expedition: An 1804–1806 United States expedition that explored the Louisiana Purchase and traveled up the Missouri River. The expedition followed the river westward as a principal route into the newly acquired territory.
Missouri River mainstem dams: A system of six large dams and reservoirs on the Missouri River’s upper main stem. The dams regulate floods, generate hydropower, support navigation, and store water.
Missouri River ecosystem: The communities of organisms and habitats associated with the Missouri River and its floodplain. Dams and channelization altered habitat and the river’s natural seasonal flows.
Yellowstone River: A major tributary of the Missouri River flowing through Wyoming, Montana, and North Dakota. It is one of the Missouri’s largest tributaries, joining it in western North Dakota.
Fort Mandan: A winter encampment built by the Lewis and Clark Expedition near present-day Washburn, North Dakota. The expedition wintered beside the Missouri before continuing upstream in 1805.

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