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Peconic River
Peconic in Riverhead 1.jpg
The Peconic near its mouth in Riverhead, New York
Country United States
Physical characteristics
Main source Brookhaven National Laboratory
249 feet (76 m)
River mouth Riverhead/Flanders Bay
0 ft (0 m)
Length 15 mi (24 km)
  • Average rate:
    37 cubic feet (1 m3)/second
Basin features
Basin size 75 sq mi (194 km2)

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

Peconic in Riverhead
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 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.

List of crossings of the Peconic River

Crossings Carries Location Coordinates
Unnamed road bridge Schultz Road
(former Suffolk CR 25)
South Manor and Calverton
Unnamed road bridge David Terry Street Manorville and Calverton '
Unnamed road bridge Connecticut Avenue
Unnamed railroad bridge Main Line of the Long Island Rail Road Calverton
Unnamed road bridge Edwards Avenue
Unnamed Road Bridge I-495 (Long Island Expressway)
Peconic Lake Dam Dam Road
(Between South River
and Forge Roads)
Unnamed road bridge Unnamed dead end street to
LIPA Sub-station from NY 25
Riverside and Riverhead
Unnamed road Bridge CR 94A (Center Drive)
Unnamed road bridge Peconic Avenue
(former NY 24-113 overlap)
Unnamed road bridge CR 105 (Cross River Drive) Flanders and Riverhead
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