The Pawcatuck River is a river in the U.S. states of Rhode Island and Connecticut flowing approximately 34 miles (55 km). There are eight dams along the river's length. The former USS Pawcatuck (AO-108) was named after the river. The river was specified as the western boundary of the Rhode Island Colony in the original charter of 1636. The river was formerly called the Charles River between its source and the mouth of the Wood River near Bradford, Rhode Island.