Grand Bayou du Large
Grand Bayou du Large in Terrebonne County, Louisiana is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 1105 acres.
- Area
- 1,105 acres
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Why Grand Bayou du Large 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 Bayou du Large, 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 Bayou du Large is a 1,105-acre lake in Terrebonne County, Louisiana.
Source: EPA Water Quality Portal sampling records, your state environmental agency, 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 Grand Bayou du Large
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 Bayou du Large
Compare lakeside cabins, hotels, and vacation rentals near Grand Bayou du Large in Terrebonne 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 Bayou du Large
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 1,105 acres |
No bathymetric survey has been published for Grand Bayou du Large, so its depth is not documented here.
Fishing Grand Bayou du Large
Nearby Lakes in Terrebonne County
Frequently asked questions about Grand Bayou du Large
Where is Grand Bayou du Large?
- Grand Bayou du Large is a lake in Terrebonne 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 Bayou du Large?
- Grand Bayou du Large in Terrebonne County, Louisiana is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 1105 acres.
Is Grand Bayou du Large safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Grand Bayou du Large 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 Bayou du Large across LakeQuality
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Where this data comes from
Measurements for Grand Bayou du Large come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.