Deer River Flow Lake
Deer River Flow Lake in Franklin County, New York is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 3.3 ft visibility. Surface area: 403 acres.
- Clarity
- 3.3 ft
- Max depth
- ~57 ft est.
- Area
- 403 acres
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Why Deer River Flow Lake has no grade
We grade a lake only when its monitoring record clears the evidence bar: at least three phosphorus or chlorophyll-a samples in the last ten years, scored against EPA National Lakes Assessment thresholds for this lake’s ecoregion. For Deer River Flow Lake, 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. Sampling here has recorded water clarity, but not phosphorus and algae (chlorophyll-a).
Not Rated is not an F. It is EPA Integrated Reporting Category 3 — insufficient information. The water here may be excellent or poor; nobody has measured enough of it to say. 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.
Deer River Flow Lake is a 403-acre lake in Franklin County, New York with an estimated average depth of about 57 feet.
Source: EPA Water Quality Portal sampling records, NYSDEC, last sampled 2020-09-26. Grade methodology: LakeGrade methodology.
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Swimming Safety
Not ratedLimited data
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Deer River Flow Lake
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Very murky, less than 3.3 ft of visibility. Trophic State Index: 60.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3.3 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 60 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Deer River Flow Lake
Compare lakeside cabins, hotels, and vacation rentals near Deer River Flow Lake in Franklin 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 Deer River Flow Lake
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Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~57 ft est. |
| Average Depth | ~15 ft est. |
| Surface Area | 403 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 Deer River Flow 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 Deer River Flow Lake
Reservoir Info (USACE NID)
Deer River Flow Lake is a man-made reservoir impounded by the Deer River Flow Dam (completed 1904), built primarily for recreation on the DEER RIVER; concrete-type dam, 10 ft tall and 300 ft long.
- Surface area
- 403 ac
- Normal storage
- 1,344 ac-ft
- Max storage
- 1,344 ac-ft
- Drainage area
- 28.3 sq mi
- Hazard class
- Low
- Owner
- NYS DEC
Source: USACE National Inventory of Dams, NID ID NY01115 · Operator website
EPA Impairment Status
Deer River Flow 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 NY0902-0011 · Official waterbody report · Matched by proximity (2.89 km)
Graded lakes near Deer River Flow Lake
Deer River Flow Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Franklin County
Frequently asked questions about Deer River Flow Lake
Where is Deer River Flow Lake?
- Deer River Flow Lake is a lake in Franklin County, New York. LakeQuality has not rated this lake (UNRATED) — there is not enough recent sampling to assign a letter.
What is the water quality grade for Deer River Flow Lake?
- Deer River Flow Lake in Franklin County, New York is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 3.3 ft visibility. Surface area: 403 acres.
Is Deer River Flow Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Deer River Flow Lake is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
How deep is Deer River Flow Lake?
- No published bathymetric survey covers Deer River Flow Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 57 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 403 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
Impairment status from EPA ATTAINS 303(d) database
Lake size & watershed from HydroLAKES (HydroSHEDS)