The Otter Tail River is a 192-mile-long river in the west-central portion of the U.S. state of Minnesota. It begins in Becker County, 40 miles southwest of Bemidji. It then flows through a number of lakes and cities in Minnesota, including Many Point Lake, Chippewa Lake, Height of Land Lake, Frazee, the Pine lakes, Rush Lake, Otter Tail Lake and Ottertaiā¦The Otter Tail River is a 192-mile-long river in the west-central portion of the U.S. state of Minnesota. It begins in Becker County, 40 miles southwest of Bemidji. It then flows through a number of lakes and cities in Minnesota, including Many Point Lake, Chippewa Lake, Height of Land Lake, Frazee, the Pine lakes, Rush Lake, Otter Tail Lake and Ottertail, West Lost Lake, Fergus Falls, and Orwell Lake.