Sleepy Hollow Lake is a 324-acre productive, nutrient-rich eutrophic lake in Greene County, New York. Water quality is graded D based on 1 sampling years through 2020.
Source: EPA Water Quality Portal sampling records, New York DNR, last sampled 2020-09-22. 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 5.9 ft. Trophic State Index: 52.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 5.9 ft | D |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 52 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 324 acres |
Where to stay near Sleepy Hollow Lake
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Fishing Sleepy Hollow Lake
Location
County Ranking
Ranked #1 of 1 lakes in Greene County
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High nutrients, frequent algae, reduced clarity
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Reservoir Info (USACE NID)
Sleepy Hollow Lake is a man-made reservoir impounded by the Sleepy Hollow Dam (completed 1972), built primarily for recreation on the MURDERERS CREEK; earth-type dam, 83 ft tall and 753 ft long.
- Surface area
- 324 ac
- Normal storage
- 8,400 ac-ft
- Max storage
- 13,500 ac-ft
- Drainage area
- 13.3 sq mi
- Hazard class
- High
- Owner
- ASSOC OF PROPERTY OWNERS OF SLEEPY HOLLOW LAKE, INC.
All listed purposes: Recreation;Water Supply.
Source: USACE National Inventory of Dams, NID ID NY00142 · Operator website
EPA Impairment Status
Sleepy Hollow 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 NY1301-0059 · Official waterbody report
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth is a modeled estimate.
Regulated Pollution Sources Nearby
22 EPA-permitted facilities operate within about 5 miles of Sleepy Hollow Lake under Clean Water Act (NPDES) discharge permits, including 4 classified by the EPA as major dischargers. 11 facilities have a reported Clean Water Act violation in the past three years.
- Hudson (C) StpHudson · 2.5 mi away · NPDES NY0022039MajorRecent violation
- Town Of Greenport StpHudson · 3.4 mi away · NPDES NY0030988MajorRecent violation
- Coxsackie (V) StpCoxsackie · 3.9 mi away · NPDES NY0033545MajorRecent violation
- New Athens Generating Co, LlcAthens · 4 mi away · NPDES NY0261009MajorRecent violation
- Sleepy Hollow Lake StpAthens · 1.1 mi away · NPDES NY0025291Recent violation
- Brick Row StpAthens · 1.3 mi away · NPDES NY0020877Recent 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: 2020-09-22
Monitoring stations: 1