Indian Lake
Putnam 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 · Nutrients (phosphorus, nitrogen)
- 37 ft max depth
- Limited data
Indian Lake in Putnam County, New York is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 24.8 ft visibility.
- Clarity
- 24.8 ft
- Max depth
- ~37 ft est.
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Stays near Indian Lake
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Watch Indian Lake’s letter
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Why Indian Lake has no grade
Indian 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, Indian Lake is Not Rated — not an F. Its 24.8-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.
Indian Lake is a lake in Putnam County, New York with an estimated average depth of about 37 feet.
Source: EPA Water Quality Portal sampling records, NYSDEC, last sampled 2020-09-21. Grade methodology: LakeQuality methodology.
What Indian Lake is good for
From access and monitoring records, not editorial picks.
- Clear water24.8 ft of visibility
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Indian Lake is listed impaired under Clean Water Act §303(d) (IR 5) for nutrients (phosphorus, nitrogen). Check local advisories before you swim.
Water quality measurements for Indian Lake
These readings exist but are not enough for an A–F grade — see why.
Crystal clear, you can see 24.8 ft down. TSI 31.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 24.8 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 31 | Oligotrophic |
Low nutrients, clear water. The letter is not a swimming clearance.
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~37 ft est. |
| Average Depth | ~21 ft est. |
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 Indian 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.
Fishing Indian Lake
EPA Impairment Status
Indian Lake is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit NY1301-0143 · Official waterbody report
Regulated Pollution Sources Nearby
5 EPA-permitted facilities operate within about 5 miles of Indian Lake under Clean Water Act (NPDES) discharge permits, including 2 classified by the EPA as major dischargers. 4 facilities have a reported Clean Water Act violation in the past three years.
- Target Hill WwtpWest Point · 4.4 mi away · NPDES NY0023761MajorRecent violation
- Highland Falls (V) WwtpHighland Falls · 4.5 mi away · NPDES NY0022586MajorRecent violation
- Walter Hoving HomeGarrison · 1.2 mi away · NPDES NY0145459Recent violation
- American Water West Point DewateringWest Point · 4.4 mi away · NPDES NY0281549Recent violation
- Garrison Station PlazaGarrison · 3.2 mi away · NPDES NY0274607
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.
Nearby Lakes in Putnam County
Frequently asked questions about Indian Lake
Where is Indian Lake?
- Indian Lake is a lake in Putnam 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 Indian Lake?
- Indian Lake in Putnam County, New York is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 24.8 ft visibility.
Is Indian Lake safe to swim in?
- The letter is not a swimming clearance. Indian Lake is listed impaired under Clean Water Act §303(d) (IR 5) for nutrients (phosphorus, nitrogen). Check local advisories before you swim.
How deep is Indian Lake?
- No published bathymetric survey covers Indian Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 37 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate.
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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
Impairment status from EPA ATTAINS 303(d) database
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Lake size & watershed from HydroLAKES (HydroSHEDS)