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    Missouri River - Wikipedia

    • The Missouri River is a river in the Central and Mountain West regions of the United States. The nation's longest, it rises in the eastern Centennial Mountains of the Bitterroot Range of the Rocky Mountains of southwestern Montana, then flows east and south for 2,341 miles (3,767 km) before entering the Mississippi River north of St. Louis, Missouri. The river drains sem… 展开

    Course

    From the Rocky Mountains, three streams rise to form the headwaters of the Missouri River:
    • The longest source stream begins near Brower's Spring in southwest Montana, 9,100 feet (2,80… 展开

    Watershed

    With a drainage basin spanning 529,350 square miles (1,371,000 km ), the Missouri River's catchment encompasses nearly one-sixth of the area of the United States or just over five percent of the continent of North America. … 展开

    Geology

    The Rocky Mountains of southwestern Montana at the headwaters of the Missouri River first rose in the Laramide Orogeny, a mountain-building episode that occurred from around 70 to 45 million years ago (the end of the … 展开

    First people

    Archaeological evidence, especially in Missouri, suggests that human beings first inhabited the watershed of the Missouri River between 10,000 and 12,000 years ago at the end of the Pleistocene. During the end of the … 展开