The Marias River is a tributary of the Missouri River , approximately 210 mi (338 km) long, in the U.S. state of Montana . It is formed in Glacier County , in northwestern Montana, by the confluence of the Cut Bank Creek and the Two Medicine River . It flows east, through Lake Elwell , formed by the Tiber Dam , then southeast, receiving the Teton River at Loma , 2 mi. (3.2 km) above its confluence with the Missouri.
3-739: The Two Medicine River is a tributary of the Marias River , approximately 60 mi (97 km) long, in northwestern Montana in the United States . It rises in the Rocky Mountain Front in Glacier National Park at the continental divide and flows east, down from the mountains and across the Blackfeet Indian Reservation . It receives Birch Creek in southeastern Glacier County and joins Cut Bank Creek to form
6-555: A small detachment of men to further explore the Marias River on the Expedition's return trip in 1806 to determine if the river ventured north above the Canada border, and he killed a young Blackfeet warrior trying to steal horses and a gun from the small detachment. The river was the scene of the 1870 Marias Massacre . The Marias is a Class I river from Tiber Dam to its confluence with
9-630: The Marias, approximately 12 mi (19 km) southeast of Cut Bank . Marias River The river was explored in 1805 by the Lewis and Clark Expedition . Some of the men on the expedition mistook it for the main branch of the Missouri until their subsequent discovery of the Great Falls of the Missouri near Great Falls, Montana . The river was named by Meriwether Lewis after his cousin, Maria Wood. Lewis led
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