Kasoag Lake
Oswego County, New York58 acresView mapDirections
Not Rated: one monitoring station are on record, but they measured water clarity only. LakeQuality’s A–F method grades total phosphorus, total nitrogen, chlorophyll-a, and turbidity; clarity is shown, not scored.
- 45 ft max depth
- Limited data
Kasoag Lake in Oswego County, New York is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 8.1 ft visibility. Surface area: 58 acres.
- Clarity
- 8.1 ft
- Max depth
- ~45 ft est.
- Area
- 58 acres
Stays via Stay22
Stays near Kasoag Lake
Compare lakeside cabins, hotels, and vacation rentals near Kasoag Lake in Oswego County, New York — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
Top-rated places to stay near Kasoag Lake
Prices for Sep 11–13, 4 adults. Change dates on the map below.
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a whole trip? See where to stay at New York’s top lakes →
Watch Kasoag Lake’s letter
Email me if this lake’s grade moves. Grades stay free.
Or email
Why Kasoag Lake has no grade
Kasoag Lake has monitoring on record from one station, but only water clarity was measured. LakeQuality’s A–F letter uses total phosphorus, total nitrogen, chlorophyll-a, and turbidity against EPA National Lakes Assessment condition classes. With none of those grading measurements on record, Kasoag Lake is Not Rated — not an F. Its 8.1-foot median from 8 readings collected 2020 is still shown as clarity, but clarity alone cannot earn a letter.
Not Rated is EPA Integrated Reporting Category 3 — insufficient information. Everything below that has been measured is still reported on this page.
Sampling is run by NYSDEC and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
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. Grade methodology: LakeQuality methodology.
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Check local advisories before you swim.
Water quality measurements for Kasoag Lake
These readings exist but are not enough for an A–F grade — see why.
Moderate clarity, visible to about 8.1 ft. TSI 47.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 8.1 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 47 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~45 ft est. |
| Average Depth | ~10 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
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.
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.
Graded lakes near Kasoag Lake
Kasoag Lake has no grade, but these lakes within a short drive do.
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. LakeQuality has not rated this lake (UNRATED) — the only measurement available is water clarity, which is not a water-quality indicator on its own — EPA's National Lakes Assessment does not grade clarity.
What is the water quality grade for Kasoag Lake?
- Kasoag Lake in Oswego County, New York is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 8.1 ft visibility. Surface area: 58 acres.
Is Kasoag Lake safe to swim in?
- The letter is 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.
Explore Kasoag Lake across LakeQuality
More New York Lake Rankings
Other Lakes in New York
Mesotrophic Lakes in New York
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)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.
Other records on this page
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Lake size & watershed from HydroLAKES (HydroSHEDS)