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Hackensack River
A view of the Hackensack River taken from the shore in Teaneck
Country	USA
States	New Jersey, New York
Counties	Hudson, NJ, Bergen, NJ, Rockland, NY
Major city	Hackensack, NJ
Length	54 mi (87 km)
Discharge at	New Milford, NJ
- average	173 cu ft/s (5 m³/s)
- maximum	880 cu ft/s (25 m³/s)
- minimum	0 cu ft/s (0 m³/s)
Discharge elsewhere
- West Nyack, NY	58 cu ft/s (2 m³/s)
Source
- location	West Haverstraw, Rockland County, New York, USA
- coordinates	41°11′00″N 73°59′24″W / 41.183333, -73.99
- elevation	120 ft (37 m)
Mouth	Newark Bay
- coordinates	40°42′55″N 74°06′42″W / 40.71528, -74.11167
- elevation	0 ft (0 m)
The Passaic and Hackensack watersheds

The Hackensack River is a river, approximately 45 mi (72 km) long, in the U.S. states of New York and New Jersey, emptying into Newark Bay, a back chamber of New York Harbor. The watershed of the river includes part of the suburban area outside New York City just west of the lower Hudson River, which it roughly parallels, separated from it by the New Jersey Palisades. It also flows through and drains the New Jersey Meadowlands. The lower river, which is navigable as far as the community of Hackensack, is heavily industrialized and forms a commercial extension of Newark Bay. Once believed to be the among the most polluted water courses in the United States, it is has staged a modest revival in recent decades. The river is sometimes affectionately nicknamed the "Hacky" for short.

The Hackensack River rises in southeastern New York, in Rockland County, just west of the Hudson River and approximately 1 mi (1.6 km) south of West Haverstraw. It flows briefly southeast, into the DeForest Lake reservoir, separated form the Hudson by less than 3 mi (5 km). South of the dam, it then flows south, diverging from the Hudson. Just across the New Jersey state line, in northern Bergen County, it is impounded to form the reservoir Lake Tappan.

South of Lake Tappan, it flows in a meandering course southward through the suburban communities of New Jersey. Near Oradell, it is impounded to form Oradell Reservoir, where it is joined by several streams, including the Dwars Kill and Pascack Brook. Van Buskirk Island, a man-made island and site of the New Milford Plant of the Hackensack Water Company, lies in this area. South of the reservoir, it flows past River Edge, Hackensack, Teaneck, and Ridgefield Park, once again approaching within 3 mi (5 km) of the Hudson, and separated from it by the ridge of the Palisades.

At Little Ferry, it is joined by the broad Overpeck Creek, then flows southward, widening in a broad meandering tidal estuary through the Meadowlands, forming extensive side streams and wetlands. South of North Bergen, it forms the boundary between Bergen County to the west and Hudson County to the east. Opposite Secaucus it is joined by Berrys Creek, then flows past the western edge of Jersey City, which overlooks the river's valley from the ridge of the Palisades, before forming Newark Bay at its confluence with the Passaic River between Jersey City and Kearny.

As it flows through the Meadowlands it is traversed by numerous rail and road bridges.

The name of the river comes from the Lenape word Ackingsack, meaning "flat confluence of streams". Conflicts with the Lenape prevented the early Dutch settlers of the New Netherland colony from expanding westward into the valley into late in the 17th century. The river furnished both the Native Americans and the European settlers with abundant runs of herring, shad and striped bass.

In the colonial era, the river and the surrounding Meadowlands presented a formidable difficulty in transportation and communication. The wetlands helped allow the escape of the Continental Army under George Washington in 1776 after several defeats at the hands of the British army on the east side of the Hudson. It later served as a protective barrier that allowed Washington's army to encamp in the nearby hills near Morristown.

In the last two centuries, the river has suffered from extremely severe pollution. The construction of the Oradell Reservoir dam in 1921 essentially changed the lower river from a free-flowing stream into a brackish estuary, allowing the encroachment of marine species. By the 1960s, however, much of the lower river was essentially a turbid oxygen-less dead zone, with only the hardiest of species such as the mummichog able to survive in its waters. Berrys Creek was once thought to be the most polluted stream in the United States.

The river has recovered somewhat in recent decades following the decline in manufacturing in the area, as well as from enforcement of such regulations as the Clean Water Act and from the efforts of local conservancy groups. Recreational fishing has staged a modest comeback, despite continuing health advisories against the consumption of catch.

The future of the wetlands around the lower river has been an ongoing controversy between development and preservation groups in recent decades. The controversial Hackensack Meadowlands Development Commission (now the New Jersey Meadowlands Commission) was formed by the state in 1968 to manage development and habitat preservation.

• Berrys Creek
• Overpeck Creek
• Pascack Brook

• List of New Jersey rivers
• List of New York rivers
• List of crossings of the Hackensack River
• Hackensack RiverWalk

• Map of the Hackensack River watershed
• Hackensack Riverkeeper an environmental organization
• Farleigh Dickinson University: Hackensack River tides
• Hackensack River bridges
• Wild New Jersey: Fishes of the Hackensack River
• Bergen SWAN
• Friends of the Hackensack River Greenway through Teaneck
• New Jersey Meadowlands Commission
• Meadowlands Environment Center
• Meadowlands Environmental Research Institute (MERI)
• Watershed Management Area 5 (WMA 5), contains the Hackensack River, Hudson River and Pascack Brook watersheds
• New Jersey Naval Museum Home of the W.W. II Submarine USS Ling (SS-297)
• USS Ling Photos on board the Submarine USS Ling SS-297
• U.S. Geological Survey: NJ stream gaging stations
• Mouth or other endpoint Newark Bay is at coordinates 40°42′55″N 74°06′42″W / 40.7152, -74.1117
• Source Near Lake Lucille, New York is at coordinates 41°10′60″N 73°59′24″W / 41.1833, -73.9899