Seven Hills Lake
Putnam County, New York56 acresView mapDirections
NY DEC publishes the water-quality measurements for Seven Hills Lake. Here is what has been measured.
- 36 ft max depth
- Public access
- Limited data
Seven Hills Lake in Putnam County, New York has water-quality measurements published by NY DEC, shown here as reported. Water clarity: 4.8 ft visibility. Surface area: 56 acres.
Seven Hills Lake is a 56-acre lake in Putnam County, New York with an estimated average depth of about 36 feet. Limited fish-species data available. Public access is available.
Source: EPA Water Quality Portal sampling records, NYSDEC, last sampled 2020-09-14. Methodology: how these readings are compared.
Seven Hills Lake covers about 56 acres in Putnam County. For a place on the water, look through cabin and lake-house rentals near Seven Hills Lake on Vrbo. For a hotel or motel room, Booking.com and Expedia both search around the lake.
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Seven Hills Lake is safe to swim in today is a call for the New York Department of Environmental Conservation and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Seven Hills Lake
These are the measurements NY DEC publishes for Seven Hills Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Murky, only visible to about 4.8 ft. TSI 54.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 4.8ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | No reading The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. | |
| Chlorophyll-a (algae) | No reading The green pigment in algae — a direct measure of how much algae is in the water. | |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 54 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Seven Hills Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
~36 ft est.
Surface area
56 acres
Public access
Yes
Listed by NY DEC
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 Seven Hills Lake.
Lake Size & Watershed
Watershed (drainage) area
6 sq mi
HydroLAKES / HydroSHEDS
Shoreline
1.4 mi
HydroLAKES / HydroSHEDS
Elevation
653 ft
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.
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Stays near Seven Hills Lake
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Fishing Seven Hills Lake
Reservoir Info (USACE NID)
Seven Hills Lake is a man-made reservoir impounded by the Seven Hills Realty CO INC Dam (completed 1957), built primarily for recreation on the TR-W BRANCH CROTON RIVER; earth-type dam, 15 ft tall and 345 ft long.
- Surface area
- 56 ac
- Normal storage
- 380 ac-ft
- Max storage
- 570 ac-ft
- Drainage area
- 5.5 sq mi
- Hazard class
- Low
- Owner
- NYCDEP DAMS EAST OF THE HUDSON RIVER;SEVEN HILLS LAKE PROPERTY OWNERS ASSOC.
Source: USACE National Inventory of Dams, NID ID NY01143 · Operator website · Matched by proximity (0.62 km)
Regulated Pollution Sources Nearby
3 EPA-permitted facilities operate within about 5 miles of Seven Hills Lake under Clean Water Act (NPDES) discharge permits. 1 facility has a reported Clean Water Act violation in the past three years.
- Package Pavement CompanyStormville · 3.5 mi away · NPDES NY0087840Recent violation
- Carmel Sch Dist Bus GaragePatterson · 2.3 mi away · NPDES NY0264466
- Camp Edward Isaacs StfEast Fishkill · 4.1 mi away · NPDES NY0101974
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 Seven Hills Lake
Where is Seven Hills Lake?
- Seven Hills Lake is a lake in Putnam County, New York. Its water-quality measurements are published by NY DEC and shown on this page as reported.
What is the water quality of Seven Hills Lake?
- Seven Hills Lake in Putnam County, New York has water-quality measurements published by NY DEC, shown here as reported. Water clarity: 4.8 ft visibility. Surface area: 56 acres.
Is Seven Hills Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
How deep is Seven Hills Lake?
- No published bathymetric survey covers Seven Hills Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 36 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate. The lake covers 56 acres.
Can I fish at Seven Hills Lake?
- Public access to Seven Hills Lake is listed as yes on the lake record. Seasons, size and bag limits, and whether you need a license are set by New York's fish and wildlife agency, so check its current regulations before you go.
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Where this data comes from
8 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
NALMS8 samples · 2020
Monitoring station identifiers (1)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.
Other records on this page
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Lake size & watershed from HydroLAKES (HydroSHEDS)