The Gowanus Canal (originally known as Gowanus Creek) is a 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.

The canal was created in the mid-19th century from local tidal wetlands and freshwater streams. For roughly a century, heavy industrial use poured pollutants into the canal. Various attempts to remove the pollution or dilute the canal's water have failed. High ratios of fecal coliforms, deadly proportions of pathogens, and a low concentration of oxygen have left it generally incompatible with macroscopic marine life, although a variety of extremophiles have been observed in the canal.

Despite the canal's heavy pollution, its proximity to Manhattan and upper-class Brooklyn neighborhoods is attracting concerted waterfront redevelopment. This has restarted calls for environmental cleanup, and prompted concerns that adjacent waterfront economic development would be incompatible with environmental restoration and environmental risks. It was designated a Superfund site in 2009, and work to clean up the canal began in 2013.

Course

The Gowanus Canal begins at Butler Street in the neighborhood of Boerum Hill, in the northwestern part of Brooklyn. The wastewater pumping station at 201-234 Butler Street, a terracotta structure dating to 1911, is located north of the canal's head. The canal then runs in a south-southwest alignment parallel to the local street grid. Its course is located mid-block between Bond Street to the west and Nevins Street to the east. Along the way it passes bridges at Union Street, Carroll Street, and Third Street from south to north. While the Union Street and Third Street Bridges are movable bascule bridges, the Carroll Street Bridge is a retractable bridge that can be rolled diagonally to let ships through.

The western bank of the Gowanus Canal hosts a boat launch at Second Street. The Second Street boat launch is located adjacent to a "Sponge Park", which absorbs pollutants from the western bank before they can go into the canal. At Fourth Street, the Fourth Street Basin splits off to the east, while the Gowanus Canal proper turns west. A walkway with seating, built as part of the construction of a Whole Foods Market, is located on the north bank of the 4th Street Basin.

At Hoyt Street, two blocks west of Bond Street, the canal turns south with two extra tributaries at the east: one tributary at Seventh Street, and another near Sixth Street.For maps of the canal and adjacent properties, see:

Measurements are calculated using Google Maps. Shortly afterward, it crosses under the Ninth Street Bridge, a vertical-lift bridge opened in 1999. The New York City Subway's Culver Viaduct, a fixed-span viaduct, crosses above the Ninth Street Bridge. The viaduct contains the Smith–Ninth Streets station, which is partially located above the canal and is served by the . There is a short tributary to the east, about long, connecting to the parking lot of a Lowe's home-improvement store to the east, and Hamilton Plaza: a shopping center located at 1-37 12th Street which formerly housed a Pathmark supermarket and a Dunkin' Donuts directly to the south. At this point, a walkway leads from Lowe's north to Ninth Street along the northern bank of the tributary and the eastern bank of the canal. Owing to its hidden location, the waterfront promenade has seen little use.

At approximately 14th Street along the eastern bank, Hamilton Avenue and the Gowanus Expressway cross the canal at a diagonal from southeast to northwest, connecting to Lorraine Street on the western bank. Separate movable bascule bridges built in 1942 carry both directions of Hamilton Avenue's traffic, while the Gowanus Expressway rises on a viaduct far above the canal.

The Gowanus Canal's mouth is at the Gowanus Bay, a portion of Upper New York Bay bordering western Brooklyn. The mouth is located near 19th Street on the eastern bank, or Bryant Street on the western bank. The canal takes a north-northeasterly course from this point, running east of Smith Street. An asphalt plant and marine transfer station are located on the canal's eastern bank, as well as a Home Depot and a FedEx Shipping Center.

History Early history Mill Creek

The Gowanus neighborhood originally surrounded Gowanus Creek. It consisted of a tidal inlet of navigable creeks in original saltwater marshland and meadows that contained wildlife. The Dutch government issued the first land patents within Breukelen (modern-day Brooklyn), including the land of the Gowanus, from 1630 to 1664. In 1636, the leaders of New Netherland bought the area around the Gowanus Bay. In 1639, the inhabitants swapped land claims with each other to build a tobacco plantation. The area's early settlers named the waterway "Gowanes Creek" after Gouwane, sachem (chief) of the local Lenape tribe called the Canarsee, who farmed on the shores.

Adam Brouwer, who had been a soldier in the service of the Dutch West India Company, built and operated the first tide-water gristmill patented in New York at Gowanus. The mill was located on land that was deeded on July 8, 1645, to Jan Evertse Bout. It was the first gristmill in the town of Breukelen and the first mill to operate in New Netherland. The mill was located north of Union Street, west of Nevins Street, and next to Bond Street. A second mill—Denton's Mill, also called Yellow Mill—was built on Denton's Mill Pond, after permission was granted to dredge from the creek to the mill pond once located between Fifth Avenue and the present-day canal at Carroll and Third Streets. On May 26, 1664, several Breuckelen residents, headed by Brouwer, petitioned Director General Peter Stuyvesant and his Council for permission to dredge a canal at their own expense through the land of Frederick Lubbertsen to supply water to run the mill. The petition was presented to the council on May 29, 1664, and the motion was granted. Another mill, Cole's Mill, was located just about at present day 9th Street, between Smith Street and the canal. Cole's Mill Pond, located north of 9th Street, occupied the present location of Public Place.Stiles, Henry R., A History of the City of Brooklyn: Including the old town and village of Brooklyn, the town of Bushwick, and the village and city of Williamsburgh ". Brooklyn, N.Y.: Pub. by subscription, 1867-1870. July 5, 2005.

Farms and oyster fishing In 1699, a settler named Nicholas Vechte built a farmhouse of brick and stone now known as the Old Stone House. In 1776, during the Battle of Long Island, American troops engaged British Army troops at the house, enabling General George Washington to relocate his troops behind American lines. This house sat at the southeastern edge of the Denton's Mill pond. Brower's Mill, also known as Freeks Mill or Brouwer's Mill, was located at the present-day intersection of Union and Nevins Streets. It can be seen in drawings depicting the Battle of Brooklyn.

Throughout this period, a few Dutch farmers settled along the marshland and engaged in clamming of large oysters that became a notable first export to Europe. The Gowanus Bay's tides pushed brackish water further into the creek, creating an environment where large bivalves thrived. In succeeding generations, negative artificial selection slowly reduced the size of the bivalves, since smaller bivalves were better adapted to the creek's water. Larger bivalves were less likely to survive, and thus, less likely to reproduce. In 1774 the Government of New York enacted a law to widen the creek into a canal, to keep the watercourse in good condition, and to levy taxes on people who used land near it.

Industrial use Transformation to city By the mid-19th century, the City of Brooklyn was quickly growing and was the United States' third-largest city. The creek and surrounding agricultural land was now part of an urban agglomeration, consisting of villages along the creek's shores. That same shoreline of river and swamp functioned as both a transportation system and an informal sewage system for the growing city. The valley's watershed is approximately and includes drainage from what are now the adjacent neighborhoods of Carroll Gardens and Park Slope. Wealthier residents tended to live inland and uphill to avoid the smells and "discomforts" of lower areas. Industries, which needed water for processing, transport, and disposal of wastes, gravitated toward sites along the shoreline.

The mills on the Gowanus were home to public landing sites, connecting the water route to the old Gowanus Road. As the local population grew, and the 19th-century industrial revolution reached Brooklyn, the need for larger navigational and docking facilities grew. Colonel Daniel Richards, a successful local merchant, advocated building a canal to benefit existing inland industries, and draining the surrounding marshes for land reclamation that would raise property values.New York City Landmarks Preservation Commission , Carroll Gardens Historic District, 1973

In 1849, under a decree by the New York Legislature, the Gowanus Creek was deepened so it could be used as a commercial waterway connected to Upper New York Bay. The creek's dredging was completed in 1860. Another act of the Legislature in 1867 allowed the canal to be deepened further. In the same decade, a developer named Edwin Litchfield undertook a project to straighten the creek into a canal.

At the time the , canal was built, several designs were proposed for it. Some included lock systems that would have allowed daily flushing of the whole waterway. However, these designs were considered too expensive. After exploring numerous alternative (and some more environmentally sound) designs, the final plan was chosen for its low cost. United States Army Corps of Engineers (USACE) Major David Bates Douglass was hired to design the canal, which was essentially complete by 1869. The cost of the construction came from assessments on the local residents of Brooklyn and State money.

Industrial heyday and massive pollution

Despite its relatively short length, the Gowanus Canal was a hub for Brooklyn's maritime and commercial shipping activity. At its busiest, as many as 100 ships a day transported cargo through it. In addition, the industrial sector around the canal grew substantially over time to include stone and coal yards; flour mills; cement works, and manufactured gas plants; tanneries, factories for paint, ink, and soap; machine shops; chemical plants; and sulfur producers. All of these industries emitted substantial water and airborne pollutants. Chemical fertilizers were manufactured along the canal soon after the Civil War.

Coal processing had been a dominant industry since 1869. By the late 19th century, there were 22 coal plants with frontage on the canal. Coal plants along the upper canal used large amounts of water in the conversion of coal to coke, liquids and gases. Coal gas was soon used for heating, light, and factory power. Coke was used to make steel. Wastewater and coal tar (now known to be a source of carcinogens) were dumped back into the canal. Brooklyn's slaughterhouses dumped blood and other wastes into the canals.