Sagamore Lake
Putnam County, New York96 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.
- 32 ft max depth
- Limited data
Sagamore Lake in Putnam County, New York is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 5 ft visibility. Surface area: 96 acres.
- Clarity
- 5 ft
- Max depth
- ~32 ft est.
- Area
- 96 acres
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Watch Sagamore Lake’s letter
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Why Sagamore Lake has no grade
Sagamore 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, Sagamore Lake is Not Rated — not an F. Its 5-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.
Sagamore Lake is a 96-acre lake in Putnam County, New York with an estimated average depth of about 32 feet.
Source: EPA Water Quality Portal sampling records, NYSDEC, last sampled 2020-09-21. 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 Sagamore Lake
These readings exist but are not enough for an A–F grade — see why.
Murky, only visible to about 5 ft. TSI 54.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 5 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 54 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~32 ft est. |
| Average Depth | ~16 ft est. |
| Surface Area | 96 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 Sagamore 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 Sagamore Lake
Reservoir Info (USACE NID)
Sagamore Lake is a man-made reservoir impounded by the Sagamore Lake Dam (completed 1946), built primarily for recreation on the WEST BRANCH CROTON RIVER; concrete-type dam, 22 ft tall and 275 ft long.
- Surface area
- 96 ac
- Normal storage
- 880 ac-ft
- Max storage
- 1,076 ac-ft
- Drainage area
- 5.91 sq mi
- Hazard class
- Significant
- Owner
- LAKE SAGAMORE COMMUNITY ASSOCIATION
Source: USACE National Inventory of Dams, NID ID NY00313 · Operator website
Regulated Pollution Sources Nearby
1 EPA-permitted facility operate within about 5 miles of Sagamore Lake under Clean Water Act (NPDES) discharge permits. 1 facility has a reported Clean Water Act violation in the past three years.
- Nysdot Region 8 Sub HeadquartersHopewell Junction · 4.2 mi away · NPDES NY0247880Recent violation
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 Sagamore Lake
Where is Sagamore Lake?
- Sagamore Lake is a lake in Putnam 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 Sagamore Lake?
- Sagamore Lake in Putnam County, New York is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 5 ft visibility. Surface area: 96 acres.
Is Sagamore Lake safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
How deep is Sagamore Lake?
- No published bathymetric survey covers Sagamore Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 32 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 96 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)
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)