Winnapaug Pond (also known as Brightman Pond) is a breached saltwater pond in Westerly, Rhode Island, United States, connected to Block Island Sound by the Weekapaug Breachway, which was constructed during the mid-1950s. The 2.5-mile (4.0 km) lake is separated from the Atlantic by a large sandbar. In 2010, its overall water quality was assessed as "good". Winnapaug is relatively small and shallow, and is favorable for kayaking.