View Lake Winnemaug, Watertown, CT in a larger map Lake Winnemaug is a large freshwater lake located in the southwestern corner of Watertown, CT . To reach Lake Winnemaug in Watertown, CT, you can either travel south along Middlebury Road and turn right onto Lake Winnemaug Road, or you can travel south on Hamilton Road, turn left onto Artillery Road and either turn right onto Pawnee Road and follow it to Osage Circle, or you can travel further along Artillery Road and turn right onto Flintlock Road.