11.6 mapped river miles, draining 79 square miles, in the Southern Long Island basin watershed. No gauge stands in it; the nearest is 13.5 miles away, and what this page knows about its temperature is NYSDEC's classification of the water itself.
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 gauge is 13.5 miles away, at Connetquot River — not a reading of this water, but of what the region is doing today.
NYSDEC's classification of this water, reach by reach. A class, not a temperature — no July mean, because none was measured here.
| Reach | Typed miles | Band | NYSDEC type |
|---|---|---|---|
| RM 11.6–3.1 | 8.5 | cold | — |
NYSDEC has classified 8.5 of the 15.3 miles NHD carries for this stream — 56% 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.
NYSDEC classifies this water as Class B — swimming and contact recreation, 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 →
2 mapped NYSDEC access sites within a quarter mile of the water, upstream first: Lower Yaphank (Lily) Lake At Yaphank (RM 7.1), Carmans River At Shirley (RM 3.3). 1 walk-in, 1 boat or canoe launches.
8 units of public or open-access land touch this river, 7,982 acres in total. Acreage is the whole unit, not the part beside the water.
| Unit | Owner | Acres |
|---|---|---|
| Wertheim National Wildlife Refuge | U.S. Fish and Wildlife Service | 2,511 |
| Suffolk Countydept Of Real Estate Land | county land | 1,722 |
| Carmans River — County Land, Fishing Access | County | 111 |
| Suffolk Countydept Of Rl Est -Camp Park Land | county land | 266 |
| Suffolk County Land | county land | 3,282 |
| Suffolk Cty Nature Presrv.dept Of Parks Rec.&conserv Land | city land | 9 |
| Carmans River Pine Barrens State Forest | state conservation department | 25 |
| Suffolk Countydept Of Rl Est- Park Land | county land | 56 |
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.
4 named streams meet this one. Confluence miles are above the mouth; the longest twelve are listed.
Carmans River sits in HUC 8 02030202, the Southern Long Island basin, and drains 79 square miles, Strahler order 2 at the mouth. 29 NHD reaches carry the name for 15.3 miles in total — more than the 11.6 miles of drawn mainstem, because NHD counts side channels and braids as their own reaches.
The closest 6 rivers on this site, straight-line from the middle of this one — not drive time.