From the Rocky Mountains of Montana and Wyoming, three streams rise to form the headwaters of the Missouri River: v. the longest begins near Brower's Spring, 9,100 feet (2,800 m) above sea level on the southeastern slopes of Mount Jefferson in the Centennial Mountains. read more
the Missouri river actually begins in Three Forks Montana and empties into the Mississippi River in North St. Louis, MO. The Ohio river empties into the Mississippi between Cairo, MO and Wycliffe, KY. read more