La Retenue du Michelbach
Haut-Rhin, FranceView mapDirections
Eau France publishes the water-quality measurements for La Retenue du Michelbach. Here is what has been measured.
- Limited data
La Retenue du Michelbach in Haut-Rhin, France has official water-quality measurements, shown as reported. Chlorophyll-a (algae): 3.8 µg/L.
How La Retenue du Michelbach is classified
La Retenue du Michelbach in France is published with the authority's own measurements and class. The measurements here are published by the agency that samples the lake, as reported. Sampling here has recorded algae (chlorophyll-a), but not water clarity and phosphorus.
LakeQuality publishes no grade of its own beside it. Everything below thathas been measured is 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. Methodology: how these readings are compared.
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether La Retenue du Michelbach is safe to swim in today is a call for the French water agencies, via UNEP GEMS/Water and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for La Retenue du Michelbach
These are the measurements Eau France publishes for La Retenue du Michelbach. More on the source.
No clarity data. Chlorophyll-a 3.8 µg/L. TSI 44.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | No reading How deep a black-and-white disk stays visible from the surface. Higher is clearer. | |
| Total phosphorus | No reading The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. | |
| Chlorophyll-a (algae) | 3.8µg/L | Measured, not scored The green pigment in algae — a direct measure of how much algae is in the water. |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 44 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
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Frequently asked questions about La Retenue du Michelbach
Where is La Retenue du Michelbach?
- La Retenue du Michelbach is a lake in Haut-Rhin, France. This page reports official water-quality measurements, shown as reported.
What is the water quality of La Retenue du Michelbach?
- La Retenue du Michelbach in Haut-Rhin, France has official water-quality measurements, shown as reported. 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 shown as the authority published them. See where the data comes from and data sources.