Big Muddy Creek (Montana)
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Big Muddy Creek is a tributary of the Missouri River, approximately 191 mi (307 km) long, in the Canadian province of Saskatchewan and the U.S. state of Montana.
It rises in southern Saskatchewan, on the plains north of the international border and approximately 20 mi (32 km) northwest of Big Beaver. It flows southwest through the Big Muddy Badlands and through Big Muddy Lake, then south into Sheridan County, Montana, past Redstone, then east, pass Plentywood, then south, forming the eastern border of Fort Peck Indian Reservation. It joins the Missouri west of Culbertson.
It was explored in 1805 by the Lewis and Clark Expedition, who noticed called it Marthay's River in their journals and noticed on their return voyage in 1806 that it had changed its mouth on the Missouri.
