Formed in western Montana by the confluence of the Jefferson, Madison, and Gallatin Rivers. It flows past Bismarck, North Dakota, and Kansas City before emptying into the Mississippi just north of St. Louis. Lewis and Clark used the Missouri as a route for exploration of the Louisiana Purchase. The Missouri is regulated by a number of major dams, including Fort Peck in Montana and Oahe Dam in South Dakota.

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1. Formed in western Montana by the confluence of the Jefferson, Madison, and Gallatin Rivers. It flows past Bismarck, North Dakota, and Kansas City before emptying into the Mississippi just north of St. Louis. Lewis and Clark used the Missouri as a route for exploration of the Louisiana Purchase. The Missouri is regulated by a number of major dams, including Fort Peck in Montana and Oahe Dam in South Dakota.