Sleepy Hollow Lake
Greene County, WisconsinLimited DataEutrophic
Sleepy Hollow Lake is a 324-acre productive, nutrient-rich eutrophic lake in Greene County, NY. Water quality is graded D based on 1 sampling years through 2020.
Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2020-09-22. Grade methodology: LakeGrade methodology.
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 |
Location
County Ranking
Ranked #1 of 1 lakes in Greene County
Nearby Lakes in Greene County
More Wisconsin Lake Rankings
Other Grade D Lakes in Wisconsin
Eutrophic Lakes in Wisconsin
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
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: 2020-09-22
Monitoring stations: 1