Missouri River
Videos
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 Mou
The Missouri River in Montana
Holter Lake, a reservoir on the upper Missouri River
The Missouri in North Dakota, which was the furthest upstream that French explorers traveled on the river
The Yellowstone River, the fifth longest tributary of the Missouri, which it joins in North Dakota
Jefferson River
Videos
The Jefferson River is a tributary of the Missouri River, approximately 83 miles long, in the U.S. state of Montana. The Jefferson River and the Madison River form the official beginning of the Missou
Confluence of Beaverhead and Big Hole Rivers forming the Jefferson near Twin Bridges, Montana
Jefferson River near Parrot Castle, October 2007
Small marine fossils can be found in the Madison Group limestone that makes up the steep, narrow section of the Jefferson River canyon.
Lewis and Clark ascended the Jefferson River in 1805 in their search for a navigable water route to the Pacific.