The Info List - Henrys Fork (Snake River)

Henrys Fork is a tributary river of the Snake River, approximately 127 miles (204 km) long,[3] 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.[4] Its mean annual discharge, as measured at river mile 9.2 (Henrys Fork near Rexburg) by the United States Geological Survey (USGS),[6] 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).[5] The river is named for Andrew Henry,[7] 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.[8] Henrys Fork of the Snake River
Snake River
near Coffee Pot Rapids

Kayaking the Coffee Pot Rapids of the Henrys Fork


1 Sources 2 River ecology 3 See also 4 References 5 External links

Sources[edit] The river's source is at Big Springs and the Henrys Lake
Henrys Lake
outlet (10 miles northwest of Big Springs). To the east is Targhee Pass, with Raynolds Pass
Raynolds Pass
to the northwest and Red Rock Pass to the southwest. The headwaters of the Henrys Fork are within 10 miles (16 km) of the headwaters of the Missouri River
Missouri River
(on the Red Rock River and Madison River), located across the continental divide in Montana. Henry's Fork drains the northeastern corner of the Snake River
Snake River
Plain, along the continental divide. River ecology[edit] The Henrys Lake
Henrys Lake
outlet is subject to substantial draw-downs from irrigation diversions during the summer. Late in the season, as the draw-downs decrease with the cooler weather, more water is released into the stream, allowing fish to move up from the lower section of the river. The Nature Conservancy
The Nature Conservancy
sponsors a learning station near the outlet stream. South of the lake at Big Springs, nearly 500,000 US gallons (1,900 m3) of constant 52 °F (11 °C) water flow into the river each day. The river flows south through a high plateau in northern Fremont County, through the Caribou-Targhee National Forest, and passes through Island Park Reservoir. It emerges from the reservoir and flows through a canyon that opens up into a broad, flat meadow in the Island Park Caldera
Island Park Caldera
in central Fremont County. The river flows slowly past the town of Island Park, through the Harriman State Park, otherwise known as the "Railroad Ranch", and then descends swiftly as it approaches the wall of the caldera, flowing over both Upper Mesa and Lower Mesa Falls, and emerges from the mountains onto the Snake River
Snake River
Plain near Ashton. It flows southwest across the plain, past St. Anthony, and splits into multiple channels into a broad inland delta north of Rexburg. It receives the Teton River from the east approximately 5 miles (8.0 km) west of Rexburg. It joins the Snake from the northeast approximately 10 miles (16 km) southwest of Rexburg, just below 4,800 feet (1,463 m). Island Park Reservoir, a component of the Minidoka Project, is used for irrigation in the Snake River
Snake River
Plain. Its drainage provides one of the most important rainbow trout fisheries in Idaho
in terms of habitat, fish populations, and use by anglers. The section of the river between Henry's Lake and Big Springs is a major spawning area for trout and is closed to fishing. Henrys Fork has long been noted for its superb fishing, especially its dry fly fishing. Bing Lempke, a pipefitter from nearby Idaho
Falls, was considered the local dean of the fishery, until he died in 1990.[9] See also[edit]

Henry's Fork Caldera List of Idaho
rivers List of longest streams of Idaho Tributaries of the Columbia River


^ Source elevation derived from Google Earth
Google Earth
search using GNIS source coordinates. ^ a b c "Henrys Fork". Geographic Names Information System. United States Geological Survey. June 21, 1979. Retrieved July 22, 2013.  ^ a b "The National Map". National Hydrography Dataset high-resolution flowline data. U.S. Geological Survey. Archived from the original on April 5, 2012. Retrieved May 4, 2011.  ^ a b "Upper Snake, Headwaters, Closed Basin Subbasins Plan Plan" (pdf). Northwest Power and Conservation Council. Retrieved October 12, 2011.  ^ a b "Upper Snake River
Snake River
basin between Irwin and Idaho
Falls, Water Resources Data, Idaho, 2005" (pdf). Retrieved October 12, 2011.  ^ "Gage 13056500". Retrieved October 12, 2011.  ^ Rees, John E. (1918). Idaho
Chronology, Nomenclature, Bibliography. W.B. Conkey Company. p. 76.  ^ Shallat, Todd A.; Bentley, E. B. (1994). Snake: The Plain and Its People. Boise, ID: Boise State University. p. 125. ISBN 978-0-932129-12-3. OCLC 31689273.  ^ Leavitt, Russell (August 15, 1983). "In Idaho: The Hatch of the Green Drake". TIME magazine. Retrieved October 12, 2011. 

External links[edit]

"Henrys Fork Drainage". Graphical Locator. University of Montana. 4 September 2003.  Harvey, Jacqueline (1999). "Henrys Fork Drainage". Idaho
Museum of Natural History. Idaho
State University.  "Henry's Fork Founda


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