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.[3]
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.[citation needed]
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.[citation needed]
The Bear Trap Canyon section downstream from Ennis and Ennis Lake is known for its class IV–Vwhitewater, drawing experienced paddlers during seasonal flows.[5]
According to Montana Fish, Wildlife & Parks, the Madison River supports many fish species, reflecting its varied aquatic habitats and long history of fisheries management.[9] 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.
Back, Howard (1938). The Waters of the Yellowstone with Rod and Fly. New York, NY: Dodd & Mead.
Parks, Richard (1998). Fishing Yellowstone National Park. Helena, MT: Falcon Press. ISBN1-56044-625-0.
Brooks, Charles E. (1979). The Living River: A fisherman's intimate profile of the Madison River watershed – its history, ecology, lore, and angling opportunities. Garden City, NJ: Nick Lyons Books. ISBN0-385-15655-3.
Mathews, Craig; Molinero, Clayton (1997). The Yellowstone Fly-Fishing Guide: A[n] authoritative guide to the waters of Yellowstone National Park. Guilford, CT: The Lyons Press. ISBN1-55821-545-X.
Brooks, Charles E. (1984). Fishing Yellowstone Waters. Clinton, NJ: New Win Publishing Inc. ISBN0-8329-0353-1.
Holt, John (1996). Montana Fly-Fishing Guide. Vol.East. Guilford, CT: The Lyons Press. ISBN1-58574-529-4.
Holt, John (1993). River Journal. Vol.Madison. Portland, OR: Frank Amato Publications. ISBN1-878175-27-0.
Staples, Bruce; Jacklin, Bob (2021). Fly Fishing West Yellowstone: A history and guide. Guilford, CT: Stackpole Books. ISBN9780811738255.
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