Barrage du Gast
Calvados, FranceView mapDirections
Eau France publishes the water-quality measurements for Barrage du Gast. Here is what has been measured.
- Limited data
Barrage du Gast in Calvados, France has official water-quality measurements, shown as reported. Water clarity: 1.4 m visibility. Chlorophyll-a (algae): 15 µg/L.
How Barrage du Gast is classified
Barrage du Gast 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.
Barrage du Gast is a lake in Calvados County, France.
Source: the French water agencies, via UNEP GEMS/Water — not the EPA Water Quality Portal, last sampled 2026-05-26. 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 Barrage du Gast 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 Barrage du Gast
These are the measurements Eau France publishes for Barrage du Gast. More on the source.
Murky, only visible to about 4.6 ft. Chlorophyll-a 15 µg/L. TSI 56.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 1.4m | 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) | 15µg/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. | 56 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
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Frequently asked questions about Barrage du Gast
Where is Barrage du Gast?
- Barrage du Gast is a lake in Calvados, France. This page reports official water-quality measurements, shown as reported.
What is the water quality of Barrage du Gast?
- Barrage du Gast in Calvados, France has official water-quality measurements, shown as reported. Water clarity: 1.4 m visibility. Chlorophyll-a (algae): 15 µg/L.
Is Barrage du Gast safe to swim in?
- Barrage du Gast 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
20 measurements from 1 monitoring station, 2020–2026. 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-fr20 samples · —
Analytical methods
- Hub'Eau / Naïades plans d'eau
Monitoring station identifiers (1)
I7005803
Authority classifications are shown as the authority published them. See where the data comes from and data sources.