Lake John
Lake John in Plaquemines County, Louisiana is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 338 acres.
- Area
- 338 acres
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Why Lake John 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 Lake John, 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.
Lake John is a 338-acre lake in Plaquemines County, Louisiana.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled recent years. Grade methodology: LakeQuality methodology.
Watch Lake John 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 Lake John
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 Lake John
Compare lakeside cabins, hotels, and vacation rentals near Lake John in Plaquemines 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 Lake John
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 338 acres |
No bathymetric survey has been published for Lake John, so its depth is not documented here.
Fishing Lake John
Nearby Lakes in Plaquemines County
Frequently asked questions about Lake John
Where is Lake John?
- Lake John is a lake in Plaquemines 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 Lake John?
- Lake John in Plaquemines County, Louisiana is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 338 acres.
Is Lake John safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Lake John is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
Explore Lake John across LakeQuality
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Where this data comes from
Measurements for Lake John come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.