Portneuf River (Idaho)

Portneuf River
The Portneuf River, as seen from U.S. Route 30 west of Lava Hot Springs, October 2004
Location of the mouth of the Portneuf River Show map of Idaho Portneuf River (Idaho) (the United States) Show map of the United States
Location
Country	United States
State	Idaho
Counties	Bannock, Caribou, Bingham, & Power
Physical characteristics
Source
• location	north of Chesterfield, Bingham County
• coordinates	43°06′10″N 112°00′13″W / 43.10278°N 112.00361°W / 43.10278; -112.00361[1]
• elevation	6,253 ft (1,906 m)[2]
Mouth	Snake River
• location	American Falls Reservoir, Bannock/Power counties
• coordinates	42°57′06″N 112°45′02″W / 42.95167°N 112.75056°W / 42.95167; -112.75056[1]
• elevation	4,357 ft (1,328 m)[1]
Length	124 mi (200 km)[3]
Basin size	1,329 sq mi (3,440 km2)[4]
Discharge
• location	at Tyhee[5]
• average	418 cu ft/s (11.8 m3/s)[5]
• minimum	32 cu ft/s (0.91 m3/s)
• maximum	1,730 cu ft/s (49 m3/s)

The Portneuf River is a 124-mile-long (200 km)^[3] tributary of the Snake River in southeastern Idaho, 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.