Windfall Pond is a cold, clear oligotrophic lake in Herkimer County, New York. Water quality is graded A based on 1 sampling years through 2023. Overall water quality is declining over recent sampling years. Compared to the 6 other monitored lakes in Herkimer County, Windfall Pond ranks #4 for water quality.
Source: EPA Water Quality Portal sampling records, New York DNR, last sampled 2023-07-05. Grade methodology: LakeGrade methodology.
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Swimming Safety
Excellent for swimming, crystal clear water with minimal algae
Water Quality Grade: A, Excellent
No clarity data. Phosphorus level: 9 µg/L. Trophic State Index: 36.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No data | |
| Phosphorus | 9 µg/L | A |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 36 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near Windfall Pond
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Fishing Windfall Pond
Water Quality Trend: ↓ Declining
Based on 4 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Phosphorus | ↓ Declining | +0.6 µg/L/yr | 4 |
Location
County Ranking
Ranked #4 of 7 lakes in Herkimer County
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Low nutrients, clear water, excellent for swimming
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EPA Impairment Status
Windfall Pond 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 NY0903-0211 · Official waterbody report · Matched by proximity (2.26 km)
Data Sources
Water quality data from the EPA Water Quality Portal
Impairment status from EPA ATTAINS 303(d) database
Grading methodology based on Metropolitan Council standards
Most recent sample: 2023-07-05
Monitoring stations: 1