The Little Missouri River is a tributary of the Missouri River, 560 miles long, in the northern Great Plains of the United States. Rising in northeastern Wyoming, in western Crook County about 15 miles west of Devils Tower, it flows northeastward, across a corner of southeastern Montana, and into South Dakota. In South Dakota, it flows northward through the Badla…The Little Missouri River is a tributary of the Missouri River, 560 miles long, in the northern Great Plains of the United States. Rising in northeastern Wyoming, in western Crook County about 15 miles west of Devils Tower, it flows northeastward, across a corner of southeastern Montana, and into South Dakota. In South Dakota, it flows northward through the Badlands into North Dakota, crossing the Little Missouri National Grassland and all three units of Theodore Roosevelt National Park. In the north unit of the park, it turns eastward and flows into the Missouri in Dunn County at Lake Sakakawea, where it forms an arm of the reservoir 30 miles long called Little Missouri Bay and joins the main channel of the Missouri about 25 miles northeast of Killdeer.
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