Schroon Lake
Essex County, New YorkView mapDirections
Not Rated: one monitoring station are on record, but they measured water clarity only. LakeQuality’s A–F method grades total phosphorus, total nitrogen, chlorophyll-a, and turbidity; clarity is shown, not scored.
- Impaired · Mercury
- 59 ft max depth
- Public access
- Limited data
Schroon Lake in Essex County, New York is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 14.1 ft visibility.
- Clarity
- 14.1 ft
- Max depth
- ~59 ft est.
- Public access
- Yes
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Stays near Schroon Lake
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Watch Schroon Lake’s letter
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Why Schroon Lake has no grade
Schroon Lake has monitoring on record from one station, but only water clarity was measured. LakeQuality’s A–F letter uses total phosphorus, total nitrogen, chlorophyll-a, and turbidity against EPA National Lakes Assessment condition classes. With none of those grading measurements on record, Schroon Lake is Not Rated — not an F. Its 14.1-foot median from 16 readings collected 2020 is still shown as clarity, but clarity alone cannot earn a letter.
Not Rated is EPA Integrated Reporting Category 3 — insufficient information. Everything below that has been measured is still reported on this page.
Sampling is run by NYSDEC and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Schroon Lake is a lake in Essex County, New York with an estimated average depth of about 59 feet. Limited fish-species data available. Public access is available with 1 public boat landing.
Source: EPA Water Quality Portal sampling records, NYSDEC, last sampled 2020-09-24. Grade methodology: LakeQuality methodology.
What Schroon Lake is good for
From access and monitoring records, not editorial picks.
- Clear water14.1 ft of visibility
- Boat launch1 documented ramp
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Schroon Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.
Water quality measurements for Schroon Lake
These readings exist but are not enough for an A–F grade — see why.
Good clarity, visible to about 14.1 ft. TSI 39.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 14.1 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 39 | Oligotrophic |
Low nutrients, clear water. The letter is not a swimming clearance.
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~59 ft est. |
| Average Depth | ~5 ft est. |
| Public Access | Yes |
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. New York has not published bathymetry for Schroon Lake.
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth here is modelled, not surveyed — HydroLAKES v1.0 estimates lake depth from surrounding terrain rather than from soundings. Treat it as an approximation, and prefer a state bathymetric survey where one exists.
Recreation & Access
- Schroon LakePublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Schroon Lake
EPA Impairment Status
Schroon Lake is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 4A).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit NY1104-0002 · Official waterbody report
Regulated Pollution Sources Nearby
3 EPA-permitted facilities operate within about 5 miles of Schroon Lake under Clean Water Act (NPDES) discharge permits. 2 facilities have a reported Clean Water Act violation in the past three years.
- Word Of Life CampSchroon Lake · 3.5 mi away · NPDES NY0130273Recent violation
- Schroon Lake WwtpSchroon Lake · 4.2 mi away · NPDES NY0020231Recent violation
- Word Of Life Island WwtpSchroon Lake · 3.3 mi away · NPDES NY0129623
Facilities permitted to discharge under the Clean Water Act within ~5 miles; proximity does not by itself mean a facility affects this lake. Source: EPA ECHO (ICIS-NPDES), as of 2026-07.
Graded lakes near Schroon Lake
Schroon Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Essex County
Frequently asked questions about Schroon Lake
Where is Schroon Lake?
- Schroon Lake is a lake in Essex County, New York. LakeQuality has not rated this lake (UNRATED) — the only measurement available is water clarity, which is not a water-quality indicator on its own — EPA's National Lakes Assessment does not grade clarity.
What is the water quality grade for Schroon Lake?
- Schroon Lake in Essex County, New York is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 14.1 ft visibility.
Is Schroon Lake safe to swim in?
- The letter is not a swimming clearance. Schroon Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.
How deep is Schroon Lake?
- No published bathymetric survey covers Schroon Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 59 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate.
Are there boat ramps on Schroon Lake?
- Schroon Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Schroon Lake. Public access is listed as yes.
Explore Schroon Lake across LakeQuality
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Where this data comes from
16 measurements from 1 monitoring station, 2020. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- North American Lake Management Society
NALMS16 samples · 2020
Monitoring station identifiers (1)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Lake size & watershed from HydroLAKES (HydroSHEDS)
Named boat-access points from the USGS National Boat Ramps inventory