Madison River

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The Madison River is a headwater tributary of the Missouri River, approximately Script error: No such module "convert". long, in Wyoming and Montana. Its confluence with the Jefferson and Gallatin rivers near Three Forks, Montana forms the Missouri River.

Course

The Madison River begins in Teton County, Wyoming at the confluence of the Firehole and Gibbon rivers in Yellowstone National Park, a location known as Madison Junction. It flows west out of the park and into Montana, turning north through the Rocky Mountains of southwestern Montana to join the Jefferson and Gallatin rivers at Three Forks. The Missouri River Headwaters State Park lies at this confluence.[1]

Dams and Lakes

In its upper reaches in Gallatin County, Montana, the Hebgen Dam forms Hebgen Lake. Downstream of Hebgen Dam, the 1959 Hebgen Lake earthquake led to the formation of Quake Lake, a naturally dammed body of water that remains part of the river’s hydrology. In its middle course, the Madison Dam in Madison County, Montana creates Ennis Lake. These reservoirs and lakes regulate flow, support recreation, and are associated with hydroelectric power infrastructure (see Natural Resources).

History

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 later succeeded 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.Script error: No such module "Unsubst".

On August 17, 1959, a massive earthquake near Hebgen Lake triggered a landslide that blocked the Madison River, forming Quake Lake. The quake, known as the 1959 Hebgen Lake earthquake, measured 7.3 to 7.5 on the Richter scale and caused significant loss of life and property damage in the area.Script error: No such module "Unsubst".

Recreation

The Madison is a class I river in Montana for the purposes of access for recreational use.[2]

The Bear Trap Canyon section downstream from Ennis and Ennis Lake is known for its class IV–V whitewater, drawing experienced paddlers during seasonal flows.[3]

Ecology

The Madison River is widely regarded as one of the finest trout fisheries in the world.[4][5][6] It is classified as a blue ribbon fishery in Montana, where fly fisherman target brown trout, rainbow trout, cutthroat trout, and mountain whitefish.[7]

Grizzly bears and wolves reintroduced to Yellowstone National Park roam the river valley.[8]

Fish Species

According to Montana Fish, Wildlife & Parks, the Madison River supports many fish species, reflecting its varied aquatic habitats and long history of fisheries management.[7] Both coldwater and warmwater species are present, including several native salmonids such as Arctic grayling, mountain whitefish, and westslope cutthroat trout. Introduced species like brown trout, rainbow trout, and brook trout are also well established and widely targeted by anglers. In addition to trout, the river sustains native suckers, minnows, and sculpin, contributing to the ecological complexity of the watershed. The following table provides an overview of representative fish species recorded in the Madison River.

Fish species found in the Madison River
Common name Scientific name Group Water Type Origin
Arctic Grayling Thymallus arcticus Trout Coldwater Native[9]
Brook Trout Salvelinus fontinalis Trout Coldwater Introduced[10]
Brown Trout Salmo trutta Trout Coldwater Introduced[11]
Common Carp Cyprinus carpio Minnow Warmwater Introduced[12]
Longnose Dace Rhinichthys cataractae Minnow Warmwater Native[13]
Longnose Sucker Catostomus catostomus Sucker Warmwater Native[14]
Mottled Sculpin Cottus bairdii Sculpin Native[15]
Mountain Sucker Catostomus platyrhynchus Sucker Native[16]
Mountain Whitefish Prosopium williamsoni Trout Coldwater Native[17]
Rainbow Trout Oncorhynchus mykiss Trout Coldwater Introduced[18]
Stonecat Noturus flavus Catfish Native[19]
Utah Chub Gila atraria Minnow Introduced[20]
Westslope Cutthroat Trout Oncorhynchus lewisi Trout Coldwater Native[21]
White Sucker Catostomus commersonii Sucker Warmwater Native[22]
Yellowstone Cutthroat Trout Oncorhynchus clarkii bouvieri Trout Coldwater Native[23]

See also

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References

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Sources

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External links

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