Marsh Creek (Portneuf River)

Marsh Creek
Country	United States
State	Idaho
County	Bannock County, Idaho
Source
- location	near Red Rock Pass, Bannock County, Idaho
- elevation	5,157 ft (1,572 m)
- coordinates	42°24′12″N 112°01′37″W / 42.40333°N 112.02694°W / 42.40333; -112.02694
Mouth	Portneuf River
- location	near Inkom, Bannock County, Idaho
- elevation	4,518 ft (1,377 m)
- coordinates	42°47′40″N 112°15′28″W / 42.79444°N 112.25778°W / 42.79444; -112.25778Coordinates: 42°47′40″N 112°15′28″W / 42.79444°N 112.25778°W / 42.79444; -112.25778
Length	56 mi (90 km)
Location of the mouth of Marsh Creek in Idaho

Marsh Creek is a 56-mile (90 km) longtributary of the Portneuf River in Bannock County, Idaho. Beginning at an elevation of 5,157 feet (1,572 m) near Red Rock Pass, it flows generally north near the communities of Downey and Arimo. It parallels the Portneuf River starting near McCammon, reaching its mouth near Inkom, at an elevation of 4,518 feet (1,377 m). It is roughly paralleled by Interstate 15 for most of its length.