Mirror 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.
- 25 ft max depth
- Public access
- Limited data
Mirror Lake in Essex County, New York is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 22.6 ft visibility.
- Clarity
- 22.6 ft
- Max depth
- ~25 ft est.
- Public access
- Yes
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Stays near Mirror Lake
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Watch Mirror Lake’s letter
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Why Mirror Lake has no grade
Mirror 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, Mirror Lake is Not Rated — not an F. Its 22.6-foot median from 7 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.
Mirror Lake is a lake in Essex County, New York with an estimated average depth of about 25 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 2020-09-14. Grade methodology: LakeQuality methodology.
What Mirror Lake is good for
From access and monitoring records, not editorial picks.
- Clear water22.6 ft of visibility
- Boat launch1 documented ramp
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Check local advisories before you swim.
Water quality measurements for Mirror Lake
These readings exist but are not enough for an A–F grade — see why.
Crystal clear, you can see 22.6 ft down. TSI 32.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 22.6 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 32 | Oligotrophic |
Low nutrients, clear water. The letter is not a swimming clearance.
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~25 ft est. |
| Average Depth | ~16 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 Mirror 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
- Lake PlacidPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Mirror Lake
Regulated Pollution Sources Nearby
3 EPA-permitted facilities operate within about 5 miles of Mirror Lake under Clean Water Act (NPDES) discharge permits, including 1 classified by the EPA as major discharger. 1 facility has a reported Clean Water Act violation in the past three years.
- Lake Placid (V) WpcpLake Placid · 1.3 mi away · NPDES NY0022187MajorRecent violation
- Olympic Ski Jumping ComplexNorth Elba · 2.3 mi away · NPDES NY0296678
- C/O NydecRaybrook · 4.9 mi away · NPDES NY0183661
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 Mirror Lake
Mirror Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Essex County
Frequently asked questions about Mirror Lake
Where is Mirror Lake?
- Mirror 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 Mirror Lake?
- Mirror Lake in Essex County, New York is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 22.6 ft visibility.
Is Mirror Lake safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
How deep is Mirror Lake?
- No published bathymetric survey covers Mirror Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 25 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 Mirror Lake?
- Mirror Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Lake Placid. Public access is listed as yes.
Explore Mirror Lake across LakeQuality
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Where this data comes from
7 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
NALMS7 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
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