Course
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 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.
Read more about this topic: Portneuf River (Idaho)