It rises in the Little Missouri National Grassland, in the badlands north of Amidon in northern Slope County. It flows ESE past New England, Mott, and Burt. It is joined by Cedar Creek approximately 15 mi (24 km) southwest of Shields and flows northeast, past Shields, forming the northern border of Sioux County and the Standing Rock Indian Reservation. It joins the Missouri in Lake Oahe near Cannon Ball.
The headwaters of the Missouri are in the Rocky Mountains of southwestern Montana, near the continental divide.
During the 18th century, the river was used by fur traders under the flags of Spain and France.
The entire Missouri River watershed was acquired from the French by the United States in 1803 as part of the Louisiana Purchase and explored by the Lewis and Clark Expedition, which successfully used the river in exploring for a route to the Pacific Ocean.
CANNONBALL CONCRETIONS AT THE CONFLUENCE OF THE MISSOURI & CANNONBALLRIVERS:
Cannonball Concretions at the confluence of the Missouri & CannonballRivers highlight the landscape.
The CannonballRiver in North Dakota was named, prior to Lewis and Clark's expedition, for the cannonball-shaped concretions found in the vicinity of the river.
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