Portneuf River (Idaho)
| Portneuf River | |
 The Portneuf River, seen from U.S. Highway 30 west of Soda Springs
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| Country | United States |
|---|---|
| State | Idaho |
| Counties | Bannock County, Idaho, Caribou County, Idaho, Bingham County, Idaho, Power County, Idaho |
| Source | |
| - location | north of Chesterfield, Bingham County, Idaho |
| - elevation | 6,253 ft (1,906 m) |
| - coordinates | 43°06′10″N 112°00′13″W / 43.10278°N 112.00361°W |
| Mouth | Snake River |
| - location | American Falls Reservoir, Bannock/Power counties |
| - elevation | 4,357 ft (1,328 m) |
| - coordinates | 42°57′06″N 112°45′02″W / 42.95167°N 112.75056°WCoordinates: 42°57′06″N 112°45′02″W / 42.95167°N 112.75056°W |
| Length | 124 mi (200 km) |
| Basin | 1,329 sq mi (3,442 km2) |
| Discharge | for at Tyhee |
| - average | 418 cu ft/s (12 m3/s) |
| - max | 1,730 cu ft/s (49 m3/s) |
| - min | 32 cu ft/s (1 m3/s) |
  Location of the mouth of the Portneuf River in Idaho
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The Portneuf River is a 124-mile-long (200 km)tributary of the Snake River in southeastern Idaho in the United States. It drains a ranching and farming valley in the mountains southeast of the Snake River Plain. The city of Pocatello sits along the river near its emergence from the mountains onto the Snake River Plain.
The river is part of the Columbia River Basin.
The Portneuf River rises in western Caribou County, approximately 25 miles (40 km) east of Pocatello, along the eastern side of the Portneuf Range. It flows initially south, passing westward around the southern end of the 60-mile range, and then turning north to flow between the Portneuf Range to the east and the Bannock Range to the west. It flows northwest through downtown Pocatello and enters the Snake at the southeast corner of American Falls Reservoir, approximately 10 miles (16 km) northwest of Pocatello.
The Portneuf watershed drains 850,290 acres (3,441.0 km2) in southeastern Idaho and is bounded by Malad Summit to the south, the Bannock Range to the west, the Portneuf Range to the southeast, and the Chesterfield Range to the northeast. Marsh Creek is the only major tributary to the Portneuf River. Other creeks in this watershed include Mink, Rapid, Garden,Hawkins, Birch, Dempsey, Pebble, Twentyfourmile, and Toponce creeks. The total area of the Chesterfield Reservoir is estimated at 1,236 acres (500 ha).
The Portneuf River's drainage basin is approximately 1,329 square miles (3,442 km2) in area.
Its mean annual discharge, as measured by USGS gauge 13075910 (Portneuf River at Tyhee), is 418 cubic feet per second (11.8 m3/s), with a maximum daily recorded flow of 1,730 cu ft/s (49.0 m3/s) and a minimum of 32 cu ft/s (0.906 m3/s).
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