Roaring Brook Lake
Putnam County, New York112 acresView mapDirections
NY DEC publishes the water-quality measurements for Roaring Brook Lake. Here is what has been measured.
- 29 ft max depth
- Limited data
Roaring Brook Lake in Putnam County, New York has water-quality measurements published by NY DEC, shown here as reported. Water clarity: 8.3 ft visibility. Surface area: 112 acres.
Roaring Brook Lake is a 112-acre lake in Putnam County, New York with an estimated average depth of about 29 feet.
Source: EPA Water Quality Portal sampling records, NYSDEC, last sampled 2020-09-26. Methodology: how these readings are compared.
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Roaring Brook 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 Roaring Brook Lake
These are the measurements NY DEC publishes for Roaring Brook 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 8.3 ft. TSI 47.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 8.3ft | 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 Roaring Brook Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
~29 ft est.
Surface area
112 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 Roaring Brook Lake.
Lake Size & Watershed
Watershed (drainage) area
2 sq mi
HydroLAKES / HydroSHEDS
Shoreline
2.2 mi
HydroLAKES / HydroSHEDS
Elevation
784 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.
Stays via Stay22
Stays near Roaring Brook Lake
Compare lakeside cabins, hotels, and vacation rentals near Roaring Brook Lake in Putnam 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 Roaring Brook Lake
Prices for Oct 23–25, 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 →
Follow Roaring Brook Lake’s readings
Email me when new measurements post for this lake. Updates stay free.
Or email
Fishing Roaring Brook Lake
Reservoir Info (USACE NID)
Roaring Brook Lake is a man-made reservoir impounded by the Roaring Brook Dam (completed 1959), built primarily for recreation on the ROARING BROOK; earth-type dam, 25 ft tall and 480 ft long.
- Surface area
- 112 ac
- Normal storage
- 616 ac-ft
- Max storage
- 895 ac-ft
- Drainage area
- 1.62 sq mi
- Hazard class
- High
- Owner
- Town of Putnam Valley
Source: USACE National Inventory of Dams, NID ID NY00239 · Operator website
Nearby Lakes in Putnam County
Frequently asked questions about Roaring Brook Lake
Where is Roaring Brook Lake?
- Roaring Brook Lake is a lake in Putnam 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 Roaring Brook Lake?
- Roaring Brook Lake in Putnam County, New York has water-quality measurements published by NY DEC, shown here as reported. Water clarity: 8.3 ft visibility. Surface area: 112 acres.
Is Roaring Brook Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
How deep is Roaring Brook Lake?
- No published bathymetric survey covers Roaring Brook Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 29 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 112 acres.
Explore Roaring Brook Lake across LakeQuality
More lakes in New York
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)
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
Lake size & watershed from HydroLAKES (HydroSHEDS)