Rifle River is a 60.3-mile-long (97.0 km) river in the U.S. state of Michigan. It rises in northeastern Ogemaw County and flows through Arenac County to enter Saginaw Bay of Lake Huron. Once a logging river during the Michigan forestry boom at the turn of the 20th century, the river is now primarily used for recreation, and is a state-designated natural river. It is a popular river for canoeing, with no portages or dams and an average depth of 18 inches, to 5 feet in downtown Omer.