Granny Marsh
Granny Marsh in Herkimer County, New York is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 25 acres.
- Area
- 25 acres
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Why Granny Marsh has no grade
We grade a lake only when the monitoring record supports a letter: 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 Granny Marsh, no water-quality sampling on record for this lake.
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.
Granny Marsh is a 25-acre lake in Herkimer County, New York.
Source: EPA Water Quality Portal sampling records, NYSDEC, last sampled recent years. Grade methodology: LakeQuality methodology.
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Swimming Safety
Not ratedElevated nutrients
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Granny Marsh
These readings exist but are not enough for an A–F grade — see why.
No clarity data. Trophic State Index: undefined.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) |
Where to stay near Granny Marsh
Compare lakeside cabins, hotels, and vacation rentals near Granny Marsh in Herkimer 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 Granny Marsh
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 25 acres |
No bathymetric survey has been published for Granny Marsh, so its depth is not documented here.
Fishing Granny Marsh
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Frequently asked questions about Granny Marsh
Where is Granny Marsh?
- Granny Marsh is a lake in Herkimer County, New York. LakeQuality has not rated this lake (UNRATED) — no water-quality sampling on record for this lake.
What is the water quality grade for Granny Marsh?
- Granny Marsh in Herkimer County, New York is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 25 acres.
Is Granny Marsh safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Granny Marsh is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
Explore Granny Marsh across LakeQuality
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Where this data comes from
Measurements for Granny Marsh come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.