Barrage de L'Alzeau
Barrage de L'Alzeau in Tarn, France has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 3.5 m visibility. Chlorophyll-a (algae): 1.4 µg/L.
- Clarity
- 3.5 m
Why Barrage de L'Alzeau has no A–F grade
Barrage de L'Alzeau in France is published with the authority's own measurements, not a LakeQuality letter. official authority class; not a LakeQuality A–F letter Sampling here has recorded water clarity and algae (chlorophyll-a), but not phosphorus.
A letter on the LakeQuality scale would be an invention, not an official class. Everything below that has been measured is still reported on this page.
Monitoring: the French water agencies, via UNEP GEMS/Water.
Barrage de L'Alzeau is a lake in Tarn County, France.
Source: the French water agencies, via UNEP GEMS/Water — not the EPA Water Quality Portal, last sampled 2024-10-07. Grade methodology: LakeGrade methodology.
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Swimming Safety
Not ratedLimited data
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Barrage de L'Alzeau
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Good clarity, visible to about 11.5 ft. Chlorophyll-a: 1.4 µg/L. Trophic State Index: 38.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3.5 m | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | 1.4 µg/L | Not graded |
| Trophic State Index (TSI) | 38 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near Barrage de L'Alzeau
Compare lakeside cabins, hotels, and vacation rentals near Barrage de L'Alzeau in Tarn, France — 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.
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Fishing Barrage de L'Alzeau
Frequently asked questions about Barrage de L'Alzeau
What is the water quality of Barrage de L'Alzeau?
- Barrage de L'Alzeau in Tarn, France has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 3.5 m visibility. Chlorophyll-a (algae): 1.4 µg/L.
Is Barrage de L'Alzeau safe to swim in?
- Barrage de L'Alzeau has official nutrient and clarity measurements, not a bacteria swim class and not a safety clearance. Algal blooms, currents, and depth are not covered. Always check local notices before swimming.
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Where this data comes from
38 measurements from 1 monitoring station, 2018–2024. Retrieved from UNEP GEMS/Water GFQA (not the EPA Water Quality Portal) on 2026-08-20.
Collected and reported by
- Office français de la biodiversité (Hub'Eau)
hubeau-fr38 samples · —
Analytical methods
- Hub'Eau / Naïades plans d'eau
Monitoring station identifiers (1)
Y1355023
Authority classifications are stored separately from LakeQuality A–F letters and are never blended. See how grades are calculated and data sources.