Madison River
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.

The Madison rises in Teton County in northwestern Wyoming at the confluence of the Firehole and Gibbon rivers, a location known as Madison Junction in Yellowstone National Park. It flows west then north through the mountains of southwestern Montana to join the Jefferson and Gallatin rivers at Three Forks. The Missouri River Headwaters State Park is located on the Madison at Three Forks. In its upper reaches in Gallatin County, Montana, the Hebgen Dam forms Hebgen Lake. In its middle reaches in Madison County, Montana, the Madison Dam forms Ennis Lake and provides hydroelectric power. In 1959, the 1959 Hebgen Lake earthquake formed Quake Lake just downstream from Hebgen Dam. Downstream from Ennis, the Madison flows through Bear Trap Canyon, known for its class IV-V whitewater. The Bear Trap Canyon section is part of the Lee Metcalf Wilderness area.

The river was named in July 1805 by Meriwether Lewis at Three Forks. The central fork of the three, it was named for U.S. Secretary of State James Madison, who would succeed Thomas Jefferson as President in 1809. The western fork, the largest, was named for President Jefferson and the east fork for Treasury Secretary Albert Gallatin.

The Madison is a Class I river in Montana for the purposes of access for recreational use.
Q159675
tributary
Concept
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Missouri River
LOC
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Wyoming
LOC
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Montana
LOC
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confluence
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Jefferson
LOC
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Gallatin
LOC
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Three Forks, Montana
LOC
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Teton County
LOC
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Firehole
LOC
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Gibbon
LOC
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Yellowstone National Park
LOC
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Missouri River Headwaters State Park
LOC
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Gallatin County, Montana
LOC
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Hebgen Dam
LOC
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Hebgen Lake
LOC
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Madison County, Montana
LOC
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Ennis Lake
LOC
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hydroelectric power
Concept
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1959 Hebgen Lake earthquake
LOC
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Quake Lake
LOC
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class IV-V
UNK
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whitewater
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Lee Metcalf Wilderness
LOC
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Meriwether Lewis
PER
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U.S. Secretary of State
PER
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James Madison
PER
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Thomas Jefferson
PER
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President
Concept
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Treasury Secretary
Concept
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Albert Gallatin
PER
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access for recreational use
UNK
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Madison River
LOC
1959-01-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
1959
DATE
1959-01-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
1959
DATE
1805-07-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
July 1805
DATE
1809-01-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
1809
DATE
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295
NUMBER
mouth of the watercourse
located in the administrative territorial entity
length
mouth of the watercourse
located in the administrative territorial entity
dam
has cause
inception
inception