Fall River | |
---|---|
Location | |
Country | United States |
State | Wyoming, Idaho |
Counties | Teton County, Wyoming, Fremont County, Idaho |
Physical characteristics | |
Source | |
• location | southwest of Lewis Lake, Teton County, Wyoming |
• coordinates | 44°14′51″N 110°45′43″W / 44.24750°N 110.76194°W[1] |
• elevation | 8,872 ft (2,704 m)[2] |
Mouth | Henrys Fork |
• location | northeast of St. Anthony, Fremont County, Idaho |
• coordinates | 44°01′07″N 111°34′52″W / 44.01861°N 111.58111°W[1] |
• elevation | 5,046 ft (1,538 m)[1] |
Length | 64 mi (103 km)[3] |
Fall River rises on the Madison and Pitchstone Plateaus in the southwest corner of Yellowstone National Park, Wyoming and flows approximately 64 miles (103 km)[3] to its confluence with the Henrys Fork of the Snake River near Ashton, Idaho. Historically, the river was referred to as the Middle Fork of the Snake River[4] or as Fall River or the Falls River by trappers and prospectors as early as the 1830s.[5] It was officially named the Falls River by the 1872 Hayden Geological Survey, but was always called Fall River by the locals[6] and so the U.S. Board on Geographic Names changed the official name to Fall River in 1997 at the request of Idaho authorities.[1] The river is home to numerous waterfalls and cascades in its upper reaches.