Retenue de Saint Michel
Finistère, FranceView mapDirections
Eau France publishes the water-quality measurements for Retenue de Saint Michel. Here is what has been measured.
- Limited data
Retenue de Saint Michel in Finistère, France has official water-quality measurements, shown as reported. Water clarity: 1 m visibility. Chlorophyll-a (algae): 4.5 µg/L.
How Retenue de Saint Michel is classified
Retenue de Saint Michel 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 water clarity and algae (chlorophyll-a), but not 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.
Retenue de Saint Michel is a lake in Finistère County, France.
Source: the French water agencies, via UNEP GEMS/Water — not the EPA Water Quality Portal, last sampled 2025-10-09. 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 Retenue de Saint Michel 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 Retenue de Saint Michel
These are the measurements Eau France publishes for Retenue de Saint Michel. More on the source.
Murky, only visible to about 3.4 ft. Chlorophyll-a 4.5 µg/L. TSI 52.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 1.04m | Measured, not scored 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) | 4.5µg/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. | 52 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
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Frequently asked questions about Retenue de Saint Michel
Where is Retenue de Saint Michel?
- Retenue de Saint Michel is a lake in Finistère, France. This page reports official water-quality measurements, shown as reported.
What is the water quality of Retenue de Saint Michel?
- Retenue de Saint Michel in Finistère, France has official water-quality measurements, shown as reported. Water clarity: 1 m visibility. Chlorophyll-a (algae): 4.5 µg/L.
Is Retenue de Saint Michel safe to swim in?
- Retenue de Saint Michel 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
24 measurements from 1 monitoring station, 2017–2025. 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-fr24 samples · —
Analytical methods
- Hub'Eau / Naïades plans d'eau
Monitoring station identifiers (1)
J362510T
Authority classifications are shown as the authority published them. See where the data comes from and data sources.