Kasoag Lake
Oswego County, New York58 acresView mapDirections
NY DEC publishes the water-quality measurements for Kasoag Lake. Here is what has been measured.
- 45 ft max depth
- Limited data
Kasoag Lake in Oswego County, New York has water-quality measurements published by NY DEC, shown here as reported. Water clarity: 8.1 ft visibility. Surface area: 58 acres.
Kasoag Lake is a 58-acre lake in Oswego County, New York with an estimated average depth of about 45 feet.
Source: EPA Water Quality Portal sampling records, NYSDEC, last sampled 2020-09-13. Methodology: how these readings are compared.
Kasoag Lake covers about 58 acres in Oswego County. Vrbo is where to look for cabins and lake homes around Kasoag Lake, and Booking.com and Expedia search hotels near the lake for your dates.
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Kasoag 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 Kasoag Lake
These are the measurements NY DEC publishes for Kasoag Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Moderate clarity, visible to about 8.1 ft. TSI 47.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 8.1ft | 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. | 47 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Kasoag Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
~45 ft est.
Surface area
58 acres
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 Kasoag Lake.
Lake Size & Watershed
Watershed (drainage) area
0 sq mi
HydroLAKES / HydroSHEDS
Shoreline
1.6 mi
HydroLAKES / HydroSHEDS
Elevation
633 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 Kasoag Lake
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Fishing Kasoag Lake
Reservoir Info (USACE NID)
Kasoag Lake is a man-made reservoir impounded by the Kasoag Lake Dam (completed 1820), built primarily for recreation on the WEST BRANCH FISH CREEK; earth-type dam, 10 ft tall and 180 ft long.
- Surface area
- 58 ac
- Normal storage
- 192 ac-ft
- Max storage
- 192 ac-ft
- Hazard class
- Low
- Owner
- Oswego County
Source: USACE National Inventory of Dams, NID ID NY01423 · Operator website
Regulated Pollution Sources Nearby
2 EPA-permitted facilities operate within about 5 miles of Kasoag Lake under Clean Water Act (NPDES) discharge permits. 1 facility has a reported Clean Water Act violation in the past three years.
- Omega Wire Inc - Williamstown Ny FacilityWilliamstown · 3.7 mi away · NPDES NY0106780Recent violation
- Salmon River Fish HatcheryAltmar · 4.7 mi away · NPDES NY0109053
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 Oswego County
Frequently asked questions about Kasoag Lake
Where is Kasoag Lake?
- Kasoag Lake is a lake in Oswego 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 Kasoag Lake?
- Kasoag Lake in Oswego County, New York has water-quality measurements published by NY DEC, shown here as reported. Water clarity: 8.1 ft visibility. Surface area: 58 acres.
Is Kasoag Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
How deep is Kasoag Lake?
- No published bathymetric survey covers Kasoag Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 45 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 58 acres.
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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)