Sagamore Lake is a 96-acre productive, nutrient-rich eutrophic lake in Putnam County, New York. Water quality is graded D based on 1 sampling years through 2020. Compared to the 12 other monitored lakes in Putnam County, Sagamore Lake ranks #7 for water quality.
Source: EPA Water Quality Portal sampling records, New York DNR, last sampled 2020-09-21. Grade methodology: LakeGrade methodology.
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Swimming Safety
Swimming not recommended, poor water quality with high algae risk
Water Quality Grade: D, Poor
Murky, only visible to about 5 ft. Trophic State Index: 54.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 5 ft | D |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 54 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 96 acres |
Where to stay near Sagamore Lake
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Fishing Sagamore Lake
Location
County Ranking
Ranked #7 of 13 lakes in Putnam County
Nearby Lakes in Putnam County
Explore Sagamore Lake across LakeGrade
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High nutrients, frequent algae, reduced clarity
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More records, surveys & data sources
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
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth is a modeled estimate.
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.
Data Sources
Water quality data from the EPA Water Quality Portal
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Lake size & watershed from HydroLAKES (HydroSHEDS)
Grading methodology based on Metropolitan Council standards
Most recent sample: 2020-09-21
Monitoring stations: 1