Grand Lagoon
Grand Lagoon in St. Bernard County, Louisiana is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 75 acres.
- Area
- 75 acres
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Why Grand Lagoon 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 Grand Lagoon, 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 your state environmental agency and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Grand Lagoon is a 75-acre lake in St. Bernard County, Louisiana.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled recent years. Grade methodology: LakeQuality methodology.
Watch Grand Lagoon water quality
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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 Grand Lagoon
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 Grand Lagoon
Compare lakeside cabins, hotels, and vacation rentals near Grand Lagoon in St. Bernard County, Louisiana — 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 Grand Lagoon
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 75 acres |
No bathymetric survey has been published for Grand Lagoon, so its depth is not documented here.
Fishing Grand Lagoon
Nearby Lakes in St. Bernard County
Frequently asked questions about Grand Lagoon
Where is Grand Lagoon?
- Grand Lagoon is a lake in St. Bernard County, Louisiana. LakeQuality has not rated this lake (UNRATED) — no water-quality sampling on record for this lake.
What is the water quality grade for Grand Lagoon?
- Grand Lagoon in St. Bernard County, Louisiana is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 75 acres.
Is Grand Lagoon safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Grand Lagoon is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
Explore Grand Lagoon across LakeQuality
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Where this data comes from
Measurements for Grand Lagoon come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.