National Park Service and
The Missouri River is the longest river in North America. The MNRR has been preserved as the only free-flowing sections.
The Lewis and Clark Expedition traveled along this section of the Missouri from late August to early September 1804, and again on their return trip in 1806. They explored landscape features like Spirit Mound, held council with the Yankton Sioux, and wrote the first reports on pronghorn antelope, mule deer and prairie dogs, all previously unknown to western science at that time.
Today the two stretches of the Missouri River along the Nebraska-South Dakota border are vital remnants of the historic river. In 1978 and 1991 Congress preserved these free-flowing sections by designating them as the Missouri National Recreational River and added them to the National Wild and Scenic River System.
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