Lake Peekskill is a 52-acre productive, nutrient-rich eutrophic lake in Putnam County, New York. Water quality is graded D based on 1 sampling years through 2020. Compared to the 12 other monitored lakes in Putnam County, Lake Peekskill ranks #9 for water quality.
Source: EPA Water Quality Portal sampling records, New York DNR, last sampled 2020-09-27. Grade methodology: LakeGrade methodology.
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Swimming Safety
Swimming not recommended, poor water quality with high algae risk
Water Quality Grade: D, Poor
Murky, only visible to about 3.9 ft. Trophic State Index: 57.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3.9 ft | D |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 57 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 52 acres |
Where to stay near Lake Peekskill
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Fishing Lake Peekskill
Location
County Ranking
Ranked #9 of 13 lakes in Putnam County
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High nutrients, frequent algae, reduced clarity
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Reservoir Info (USACE NID)
Lake Peekskill is a man-made reservoir impounded by the Lake Peekskill Dam (completed 1928), built primarily for recreation on the HOLLOWBROOK; concrete-type dam, 16 ft tall and 120 ft long.
- Surface area
- 52 ac
- Normal storage
- 1,074 ac-ft
- Max storage
- 1,357 ac-ft
- Drainage area
- 0.6 sq mi
- Hazard class
- High
- Owner
- LAKE PEEKSKILL IMPROVEMENT DISTRICT
Source: USACE National Inventory of Dams, NID ID NY00087 · Operator website
EPA Impairment Status
Lake Peekskill 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 NY1301-0147 · Official waterbody report
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth is a modeled estimate.
Regulated Pollution Sources Nearby
1 EPA-permitted facility operate within about 5 miles of Lake Peekskill under Clean Water Act (NPDES) discharge permits. 1 facility has a reported Clean Water Act violation in the past three years.
- Peekskill (C) WtpPeekskill · 2.8 mi away · NPDES NY0274585Recent violation
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.
Data Sources
Water quality data from the EPA Water Quality Portal
Impairment status from EPA ATTAINS 303(d) database
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Lake size & watershed from HydroLAKES (HydroSHEDS)
Grading methodology based on Metropolitan Council standards
Most recent sample: 2020-09-27
Monitoring stations: 1