{{Short description|River in the United States of America}} {{Use American English|date=February 2025}} {{more citations needed|date=May 2013}} {{Infobox river | name = Peconic River | image = File:Peconic in Riverhead 1.jpg | image_caption = The Peconic near its mouth in Riverhead, New York | source1_location = Brookhaven National Laboratory | mouth_location = Riverhead/Flanders Bay | subdivision_type1 = Country | subdivision_name1 = United States | length_mi = 15 | source1_elevation = {{convert|249|ft|m|0}} | mouth_elevation = {{convert|0|ft|m|abbr=on}} | discharge1_avg = {{convert|37|cuft/s|m3/s|0}} | basin_size_mi2 = 75 }} The '''Peconic River''' is a river within Suffolk County on Long Island, New York.<ref>[https://books.google.com/books?id=ewczAQAAMAAJ&q=Peconic+River+Maintenance+Dredging+Through+Flanders+Bay:+Environmental+Impact+Statement ''Peconic River Maintenance Dredging Through Flanders Bay: Environmental Impact Statement'']. United States. Army. Corps of Engineers. 1973</ref> 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. thumb|right|300px|Peconic River thumb|right|300px|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.
==List of crossings of the Peconic River== {| class="wikitable sortable" ! Crossings ! Carries ! Location ! Coordinates |- | Unnamed road bridge | Schultz Road<br/>(former Suffolk CR 25) | South Manor and Calverton | |- | Unnamed road bridge | David Terry Street | rowspan=2|Manorville and Calverton | ' |- | Unnamed road bridge | Connecticut Avenue | |- | Unnamed railroad bridge | Main Line of the Long Island Rail Road | rowspan=4|Calverton | |- | Unnamed road bridge | Edwards Avenue | |- | Unnamed Road bridge | {{Jct|state=NY|I|495|name1=Long Island Expressway}} | |- | Peconic Lake Dam | Dam Road<br/>(Between South River<br/>and Forge Roads) | |- | Unnamed road bridge | Unnamed dead end street to<br/>LIPA Sub-station from NY 25 | rowspan=3|Riverside and Riverhead | |- | Unnamed road bridge | {{Jct|state=NY|CR|94A|county1=Suffolk|name1=Center Drive}} | |- | Unnamed road bridge | Peconic Avenue<br/>(former NY 24-113 overlap) | |- | Unnamed road bridge | {{Jct|state=NY|CR|105|county1=Suffolk|name1=Cross River Drive}} | Flanders and Riverhead | |- |}
==See also== *List of New York rivers
==References== {{reflist}}
==External links== *[http://www.peconicpaddler.com/pcanoe.html Paddling the Peconic River] {{Webarchive|url=https://web.archive.org/web/20210211012218/http://www.peconicpaddler.com/pcanoe.html |date=2021-02-11 }} *[https://web.archive.org/web/20050506053024/http://www.nyswaterfronts.com/downloads/pdfs/sig_hab/LongIsland/Peconic_River.pdf Peconic River information]
{{coord|40|54|53.67|N|72|41|00.34|W|display=title|type:river}}
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Category:Rivers of Suffolk County, New York Category:Rivers of New York (state) Category:Brookhaven, New York Category:Riverhead, New York Category:Southampton (town), New York
{{SuffolkCountyNY-geo-stub}} {{NewYork-river-stub}}