Musselshell is located 20 miles east of Roundup along the Musselshell River. Musselshell takes its name from the Musselshell River, named by Lewis and Clark for the freshwater mussels lining the riverbank. In nearby Roundup, Musselshell Valley Historical Museum recreates the area's history with photographs and detailed displays of the area's homesteading, mining. Explore the natural science exhibit and view birds and wildlife that are native to the surrounding hills and prairies.