Grass River Flow
Grass River Flow in St. Lawrence County, New York is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 185 acres.
- Area
- 185 acres
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Why Grass River Flow 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 Grass River Flow, 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.
Grass River Flow is a 185-acre lake in St. Lawrence 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 Grass River Flow
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 Grass River Flow
Compare lakeside cabins, hotels, and vacation rentals near Grass River Flow in St. Lawrence 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 Grass River Flow
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 185 acres |
No bathymetric survey has been published for Grass River Flow, so its depth is not documented here.
Fishing Grass River Flow
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Frequently asked questions about Grass River Flow
Where is Grass River Flow?
- Grass River Flow is a lake in St. Lawrence 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 Grass River Flow?
- Grass River Flow in St. Lawrence County, New York is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 185 acres.
Is Grass River Flow safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Grass River Flow is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
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Where this data comes from
Measurements for Grass River Flow come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.