Coordinates: 41°34′59″N 73°25′12″W / 41.5831°N 73.4200°W The East Aspetuck River is a 9.9-mile-long (15.9 km) river in Litchfield County, Connecticut, in the United States. It begins at Lake Waramaug, in the town of Washington, and flows south through New Preston and Northville, before emptying into the Housatonic River in New Milford.