Westerly is a town on the southwestern shoreline of Washington County, Rhode Island, United States founded in 1669 by John Babcock. It is a beachfront community on the south shore of the state. The population was 22,787 at the 2010 census.On the western border of Westerly flows the Pawcatuck River, once renowned for its own species of Westerly salmon, three of which are on the town's crest. The river flows from some fifteen miles inland, emptying into Little Narragansett Bay. It also serves as the boundary between Westerly and Pawcatuck, Connecticut. Along the coast of Westerly lie salt ponds which serve as shallow reeflike pools whose outer walls form the long, white beaches for which the town became renowned. From west to east, these ponds are called Maschaug Pond, Winnapaug Pond, and Quonochontaug Pond. The town also has the fresh water lake Chapman's Pond which is undergoing revitalization. A type of granite known as Westerly granite has long been quarried here.