Lake Mohegan
Westchester County, New YorkView mapDirections
NY DEC publishes the water-quality measurements for Lake Mohegan. Here is what has been measured.
- Impaired · Nutrients (phosphorus, nitrogen)
- 35 ft max depth
- Limited data
Lake Mohegan in Westchester County, New York has water-quality measurements published by NY DEC, shown here as reported. Water clarity: 3.4 ft visibility.
Lake Mohegan is a lake in Westchester County, New York with an estimated average depth of about 35 feet.
Source: EPA Water Quality Portal sampling records, NYSDEC, last sampled 2020-09-28. Methodology: how these readings are compared.
For a place on the water, look through cabin and lake-house rentals near Lake Mohegan on Vrbo. For a hotel or motel room, Booking.com and Expedia both search around the lake.
Swimming conditions
No readingRecreation use not supported
Nutrient and algae readings are not a swimming clearance. Lake Mohegan is listed impaired under Clean Water Act §303(d) (IR 5) for nutrients (phosphorus, nitrogen). Check local advisories before you swim.
Whether Lake Mohegan 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 Lake Mohegan
These are the measurements NY DEC publishes for Lake Mohegan, 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 3.4 ft. TSI 59.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 3.4ft | 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. | 59 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Lake Mohegan
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
~35 ft est.
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 Lake Mohegan.
Lake Size & Watershed
Watershed (drainage) area
1 sq mi
HydroLAKES / HydroSHEDS
Surface area
82 acres
HydroLAKES / HydroSHEDS
Shoreline
2.4 mi
HydroLAKES / HydroSHEDS
Elevation
459 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 Lake Mohegan
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Fishing Lake Mohegan
EPA Impairment Status
Lake Mohegan is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).
Causes of impairment
Designated uses not supporting: Recreation.
Source: EPA ATTAINS assessment unit NY1301-0149 · Official waterbody report
Regulated Pollution Sources Nearby
9 EPA-permitted facilities operate within about 5 miles of Lake Mohegan under Clean Water Act (NPDES) discharge permits, including 1 classified by the EPA as major discharger. 3 facilities have a reported Clean Water Act violation in the past three years.
- Yorktown Heights Sd WwtpYorktown Heights · 4.4 mi away · NPDES NY0026743MajorRecent violation
- Valeria Sewer Treatment PlantCortlandt, Town Of · 4.5 mi away · NPDES NY0035050Recent violation
- Coachlight Square Wwtp Aka Kings FerryMontrose · 4.6 mi away · NPDES NY0037036Recent violation
- Mobil Cortlandt Ss#06-G6JPeekskill · 2 mi away · NPDES NY0166413
- Mobil SS06-G7J - YorktownYorktown Heights · 2.1 mi away · NPDES NY0250317
- Lakeside Village StpYorktown Heights · 2.1 mi away · NPDES NY0026727
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 Westchester County
Frequently asked questions about Lake Mohegan
Where is Lake Mohegan?
- Lake Mohegan is a lake in Westchester 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 Lake Mohegan?
- Lake Mohegan in Westchester County, New York has water-quality measurements published by NY DEC, shown here as reported. Water clarity: 3.4 ft visibility.
Is Lake Mohegan safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Lake Mohegan is listed impaired under Clean Water Act §303(d) (IR 5) for nutrients (phosphorus, nitrogen). Check local advisories before you swim.
How deep is Lake Mohegan?
- No published bathymetric survey covers Lake Mohegan, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 35 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate.
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Where this data comes from
7 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
NALMS7 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
Impairment status from EPA ATTAINS 303(d) database
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Lake size & watershed from HydroLAKES (HydroSHEDS)