The Gowanus Canal (originally known as Gowanus Creek) is a 1.8-mile-long (2.9 km) canal in the New York City borough of Brooklyn, on the westernmost portion of Long Island. Once a vital cargo transportation hub, the canal has seen decreasing use since the mid-20th century as domestic shipping declined. It continues to be used for occasional movement of goods and daily navigation of small boats, tugs, and barges. It is among the most polluted bodies of water in the United States.
Connected to Gowanus Bay in Upper New York Bay, the Gowanus Canal borders the neighborhoods of Red Hook, Carroll Gardens, and Gowanus, all within South Brooklyn, to the west; Park Slope to the east; Boerum Hill and Cobble Hill to the north; and Sunset Park to the south. Seven bridges or viaducts cross the canal, carrying, from north to south, Union Street, Carroll Street, Third Street, the New York City Subway's Culver Viaduct, Ninth Street, Hamilton Avenue, and the Gowanus Expressway.