* Competing with the D River in Lincoln City, Oregon for the title of the world's shortest river, the Roe River flows near Great Falls. Both rivers lengths vary from 58 feet to 200 feet. The source for this small river is Giant Springs, the largest freshwater spring in the United States. | * Competing with the D River in Lincoln City, Oregon for the title of the world's shortest river, the Roe River flows near Great Falls. Both rivers lengths vary from 58 feet to 200 feet. The source for this small river is Giant Springs, the largest freshwater spring in the United States. |