Shawmut was part of old Meagher County when the post office opened in 1885. The town is named for a local rancher and was once a station on the Milwaukee. It it now a country store and post office between Harlowton and Ryegate along the Musselshell River. (from Cheney's
Names on the Face of Montana, Mountain Press Publishing Company) Nearby
Deadman's Basin Reservoir is well known for camping, fishing boating and swimming. The
Avaceratops lammersi dinosaur was discovered in the Shawmut area and it is now housed in the
Upper Musselshell Museum in Harlowton. This two-story limestone building, constructed in 1909, is filled with treasures that belong to the people who lived in, worked and developed the Upper Musselshell River country.