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Madison River

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The Madison River is a headwater tributary of the Missouri River, approximately 183 miles (295 km) long, in Wyoming and Montana. Its confluence with the Jefferson and Gallatin rivers near Three Forks, Montana forms the Missouri River.

Lower Madison River In Bear Trap Canyon Below Ennis, Montana

Jefferson River

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The Jefferson River is a tributary of the Missouri River, approximately 83 miles (134 km) long, in the U.S. state of Montana. The Jefferson River and the Madison River form the official beginning of the Missouri at Missouri Headwaters State Park near Three Forks. It is joined 0.6 miles (1.0 km) downstream (northeast) by the Gallatin.

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.