South Fork Musselshell River

The South Fork Musselshell River is a tributary of the Musselshell River in south central Montana in the United States. It is approximately 32 miles long.
It rises in the Lewis and Clark [National Forest] in the Crazy Mountains in southern Meagher [County, Montana|Meagher County]. It flows northeast, joining the North Fork to form the Musselshell near Martinsdale just west of county line with Wheatland County.
There are five native fish found in the river: Longnose dace, Longnose Sucker, Mottled sculpin, Mountain Whitefish, and White Sucker. Three varieties of trout are introduced species.