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Nissequogue River, New York

18.0 mapped river miles, draining 27 square miles, in the Northern Long Island basin watershed. A USGS gauge stands in it, but its record is too short for a measured July mean, so what this page knows about its temperature is today's reading and NYSDEC's classification of the water itself.

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Public land — where the bank is open to walk and fish

USGS gauge — live water temperature

Water temperature — the colour of the river, and of every dot on it

58 64 70

50°F and colder is cold, through cold-transitional and cool, to warm above 70°F — the same four bands, breaking at 58, 64 and 70°F, that the app paints. Grey is water nobody has measured.

The nearest live reading

The nearest gauge is 0.4 miles away, at Nissequogue River — not a reading of this water, but of what the region is doing today. A closer gauge has stopped reporting — it has sent no water temperature for 1455 days, since 4 October 2022, so no number here comes from it.

Thermal classification

NYSDEC's classification of this water, reach by reach. A class, not a temperature — no July mean, because none was measured here.

NYSDEC has classified 4.2 of the 18.1 miles NHD carries for this stream — 23% of it. Every typed reach carries the same class, cold. The untyped reaches are not warm water — they are water NYSDEC's inventory does not reach, and the mile ranges above span only the reaches it does.

Questions about this river

• Nissequogue River fishing report — what it reads right now
• How to get to the Nissequogue River — access, parking and public land
• Nissequogue River fishing regulations — season, size and gear by reach

NYSDEC classification

NYSDEC classifies this water as Class C — fishing and Class SC — fishing, saline. More than one class appears because the classification changes along the river. The thermal bar above shows where. On those reaches DEC also designates it trout spawning waters, trout waters — which is the half of the classification that is about temperature, and the half this map paints by. The class is a designation of best usage under 6 NYCRR — what the water is protected for — and not the season and creel rules, which change yearly and live with the agency.

NYSDEC water quality classifications and standards →

Access

1 mapped NYSDEC access site within a quarter mile of the water, upstream first: Nissequogue River At Smithtown (RM 13.7). 1 walk-in, 0 boat or canoe launches.

Public land on the river

10 units of public or open-access land touch this river, 7,957 acres in total. Acreage is the whole unit, not the part beside the water.

Species

NYSDEC designates this as trout water — Trout spawning waters, Trout waters — without naming the species. No fish survey or stocking record for this water is in the files this site reads.

Tributaries and watershed

2 named streams meet this one. Confluence miles are above the mouth; the longest twelve are listed.

• Northeast Branch 4.1 mi · RM 15.9
• Sunken Meadow Creek 2.4 mi · RM 8.4

Nissequogue River sits in HUC 8 02030201, the Northern Long Island basin, and drains 27 square miles, Strahler order 3 at the mouth. 36 NHD reaches carry the name for 18.1 miles in total — more than the 18.0 miles of drawn mainstem, because NHD counts side channels and braids as their own reaches.

Other water nearby

The closest 6 rivers on this site, straight-line from the middle of this one — not drive time.

• Northeast Branch 5.3 mi
• Connetquot Brook 10.5 mi
• Carmans River 13.1 mi
• Swan River 13.2 mi
• Champlin Creek 13.4 mi
• Sampawams Creek 13.6 mi