Roaring Brook Lake
Putnam County, New York112 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.
- Impaired · Metals (other than mercury)
- 29 ft max depth
- Limited data
Roaring Brook Lake in Putnam County, New York is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 8.3 ft visibility. Surface area: 112 acres.
- Clarity
- 8.3 ft
- Max depth
- ~29 ft est.
- Area
- 112 acres
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Watch Roaring Brook Lake’s letter
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Why Roaring Brook Lake has no grade
Roaring Brook 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, Roaring Brook Lake is Not Rated — not an F. Its 8.3-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.
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. Grade methodology: LakeQuality methodology.
What Roaring Brook Lake is good for
From access and monitoring records, not editorial picks.
- Camping1 public campground nearby
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Roaring Brook Lake is listed impaired under Clean Water Act §303(d) (IR 5) for metals (other than mercury). Check local advisories before you swim.
Water quality measurements for Roaring Brook Lake
These readings exist but are not enough for an A–F grade — see why.
Moderate clarity, visible to about 8.3 ft. TSI 47.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 8.3 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 | ~29 ft est. |
| Average Depth | ~16 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
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.
Recreation & Access
Public campgrounds near Roaring Brook Lake
- Fahnestock State Park Campground3.3 km
Nearest public campgrounds in the USGS National Map inventory, within about 3 miles. An empty list means USGS records no campground that close, which is not the same as camping being unavailable. Where the source gives an official reservation link, it is used; the cabin and hotel search does not cover campsites. More camping lakes
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
EPA Impairment Status
Roaring Brook Lake is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit NY1301-0153 · Official waterbody report · Matched by proximity (2.08 km)
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. 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 Roaring Brook Lake?
- Roaring Brook Lake in Putnam County, New York is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 8.3 ft visibility. Surface area: 112 acres.
Is Roaring Brook Lake safe to swim in?
- The letter is not a swimming clearance. Roaring Brook Lake is listed impaired under Clean Water Act §303(d) (IR 5) for metals (other than mercury). 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.
Are there campgrounds on Roaring Brook Lake?
- Roaring Brook Lake has 1 public campground from USGS The National Map within 5 km, including Fahnestock State Park Campground. This is a location join, not a booking. Cabins and hotels are listed separately; campsite reservations use the official link when the source provides one.
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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
Impairment status from EPA ATTAINS 303(d) database
Lake size & watershed from HydroLAKES (HydroSHEDS)
Public campgrounds from USGS The National Map Structures, within about 3 miles