La Retenue du Michelbach
La Retenue du Michelbach in Haut-Rhin, France has official water-quality measurements, not a LakeQuality A–F grade. Chlorophyll-a (algae): 3.8 µg/L.
Why La Retenue du Michelbach has no A–F grade
La Retenue du Michelbach 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 algae (chlorophyll-a), but not water clarity and 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.
La Retenue du Michelbach is a lake in Haut-Rhin County, France.
Source: the French water agencies, via UNEP GEMS/Water — not the EPA Water Quality Portal, last sampled 2016-11-14. 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 La Retenue du Michelbach
These readings exist but do not meet the evidence bar for an A–F grade — see why.
No clarity data. Chlorophyll-a: 3.8 µg/L. Trophic State Index: 44.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | 3.8 µg/L | Not graded |
| Trophic State Index (TSI) | 44 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near La Retenue du Michelbach
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Fishing La Retenue du Michelbach
Frequently asked questions about La Retenue du Michelbach
What is the water quality of La Retenue du Michelbach?
- La Retenue du Michelbach in Haut-Rhin, France has official water-quality measurements, not a LakeQuality A–F grade. Chlorophyll-a (algae): 3.8 µg/L.
Is La Retenue du Michelbach safe to swim in?
- La Retenue du Michelbach 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
5 measurements from 1 monitoring station, 2016. 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-fr5 samples · —
Analytical methods
- Hub'Eau / Naïades plans d'eau
Monitoring station identifiers (1)
A1238503
Authority classifications are stored separately from LakeQuality A–F letters and are never blended. See how grades are calculated and data sources.