Lake Formosa
Lake Formosa in Tensas County, Louisiana is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 69 acres.
- Area
- 69 acres
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Why Lake Formosa 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 Formosa, 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 Formosa is a 69-acre lake in Tensas County, Louisiana.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled recent years. Grade methodology: LakeQuality methodology.
Watch Lake Formosa 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 Formosa
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 Formosa
Compare lakeside cabins, hotels, and vacation rentals near Lake Formosa in Tensas 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 Formosa
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 69 acres |
No bathymetric survey has been published for Lake Formosa, so its depth is not documented here.
Fishing Lake Formosa
Nearby Lakes in Tensas County
Frequently asked questions about Lake Formosa
Where is Lake Formosa?
- Lake Formosa is a lake in Tensas 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 Formosa?
- Lake Formosa in Tensas County, Louisiana is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 69 acres.
Is Lake Formosa safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Lake Formosa 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 Formosa across LakeQuality
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Where this data comes from
Measurements for Lake Formosa come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.