In Baldwinville

The Otter River is a river in Massachusetts that flows approximately 10 miles and is a major tributary of the Millers River which in turn is a tributary of the Connecticut River. The Otter River enters the Millers River in Winchendon in Otter River State Forest.

Coordinates: 42°38′10″N 72°05′38″W / 42.63611°N 72.09389°W / 42.63611; -72.09389