Henrys Fork (Snake River tributary)
Henrys Fork is a tributary river of the Snake River, approximately 127 miles (204 km) long, in southeastern Idaho in the United States. It is also referred to as the North Fork of the Snake River. Its drainage basin is 3,212 square miles (8,320 km2), including its main tributary, the Teton River. Its mean annual discharge, as measured at river mile 9.2 (Henrys Fork near Rexburg) by the United States Geological Survey (USGS), is 2,096 cubic feet per second (59.4 m3/s), with a maximum daily recorded flow of 79,000 cubic feet per second (2,240 m3/s), and a minimum of 183 cubic feet per second (5.18 m3/s). It is normally transcribed without an apostrophe.
| Henrys Fork | |
|---|---|
Henrys Fork in eastern Idaho | |
Henrys Fork upper drainage | |
Location of the mouth of Henrys Fork in Idaho | |
| Location | |
| Country | United States |
| State | Idaho |
| Counties | Fremont County, Idaho, Madison County, Idaho |
| Physical characteristics | |
| Source | |
| • location | near Island Park, Fremont County, Idaho |
| • coordinates | 44°29′34″N 111°16′58″W |
| • elevation | 6,397 ft (1,950 m) |
| Mouth | Snake River |
• location | southwest of Rexburg, Madison County, Idaho |
• coordinates | 43°45′10″N 111°57′28″W |
• elevation | 4,800 ft (1,500 m) |
| Length | 127 mi (204 km) |
| Basin size | 3,212 sq mi (8,320 km2) |
| Discharge | |
| • location | near Rexburg |
| • average | 2,096 cu ft/s (59.4 m3/s) |
| • minimum | 183 cu ft/s (5.2 m3/s) |
| • maximum | 79,000 cu ft/s (2,200 m3/s) |
The river is named for Andrew Henry, who first entered the Snake River plateau in 1810. Employed by the Missouri Fur Company, he built Fort Henry on the upper Snake River, near modern St. Anthony, but abandoned this first American fur post west of the continental divide the following spring.