Missouri River

Considered as a separate river, the Missouri is the longest in the United States. In combination with the Mississippi River into which it flows at St Louis, it is the longest river [I]system[/I] in the U.S. The river begins where the Gallatin River, Jefferson River, and Madison River come together in the foothills of the Rockies in Montana. It flows through Montana, North Dakota and South Dakota, before forming the boundary between Iowa and Nebraska. It forms the extreme northeast border of Kansas before turning almost due east through the state of Missouri.

South Dakota cities on the river include Pierre, Mobridge, Oacoma, Chamberlain, Pickstown, Fort Thompson, and Lower Brule.

Lake Oahe is formed by Oahe Dam at Pierre.

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