Peconic River

The Peconic River is a river within Suffolk County on Long Island, New York. The river is located in the eastern end of Long Island. The Peconic River drains an area between the Harbor Hill Moraine and flows into Flanders Bay, which in turn connects to Peconic Bay east of Riverhead.

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Peconic River
The Peconic near its mouth in Riverhead, New York
United States
Brookhaven National Laboratory
249 feet (76 m)
Riverhead/Flanders Bay
0 ft (0 m)
15 mi (24 km)
75 mi2 (190 km2)
37 cubic feet per second (1 m3/s)

The Peconic River is a river within Suffolk County on Long Island, New York. The river is located in the eastern end of Long Island. The Peconic River drains an area between the Harbor Hill Moraine and flows into Flanders Bay, which in turn connects to Peconic Bay east of Riverhead.

Peconic River

The Peconic River near its mouth in Riverhead, New York

The river originates in bogs and wetlands in central Long Island near the Brookhaven National Laboratory and flows eastward to the Peconic Bay. It is the longest river on Long Island and is almost entirely within the Central Long Island Pine Barrens publicly protected area, which was set up in 1993 to protect its relative wilderness standing.

It is fresh water until about the center of Riverhead where it becomes an estuary.

The river is slow-moving, making it ideal for canoeing and kayaking.

It forms the border between Brookhaven and Riverhead towns as well as the border between Riverhead and Southampton.

CrossingsCarriesLocationCoordinates
Unnamed road bridgeSchultz Road(former Suffolk CR 25)South Manor and Calverton
Unnamed road bridgeDavid Terry StreetManorville and Calverton'
Unnamed road bridgeConnecticut Avenue
Unnamed railroad bridgeMain Line of the Long Island Rail RoadCalverton
Unnamed road bridgeEdwards Avenue
Unnamed Road bridgeI-495 (Long Island Expressway)
Peconic Lake DamDam Road(Between South Riverand Forge Roads)
Unnamed road bridgeUnnamed dead end street toLIPA Sub-station from NY 25Riverside and Riverhead
Unnamed road bridgeCR 94A (Center Drive)
Unnamed road bridgePeconic Avenue(former NY 24-113 overlap)
Unnamed road bridgeCR 105 (Cross River Drive)Flanders and Riverhead
  • List of New York rivers

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  • Paddling the Peconic River Archived 2021-02-11 at the Wayback Machine
  • Peconic River information

.mw-parser-output .geo-default,.mw-parser-output .geo-dms,.mw-parser-output .geo-dec{display:inline}.mw-parser-output .geo-nondefault,.mw-parser-output .geo-multi-punct,.mw-parser-output .geo-inline-hidden{display:none}.mw-parser-output .longitude,.mw-parser-output .latitude{white-space:nowrap}40°54′53.67″N 72°41′00.34″W / 40.9149083°N 72.6834278°W / 40.9149083; -72.6834278

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