Barrage-Réservoir de L'Astarac
Gers, FranceView mapDirections
Eau France publishes the water-quality measurements for Barrage-Réservoir de L'Astarac. Here is what has been measured.
- Limited data
Barrage-Réservoir de L'Astarac in Gers, France has official water-quality measurements, shown as reported. Water clarity: 1.2 m visibility. Phosphorus: 20 µg/L. Chlorophyll-a (algae): 4 µg/L.
How Barrage-Réservoir de L'Astarac is classified
Barrage-Réservoir de L'Astarac 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, phosphorus and algae (chlorophyll-a).
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-Réservoir de L'Astarac is a lake in Gers County, France.
Source: the French water agencies, via UNEP GEMS/Water — not the EPA Water Quality Portal, last sampled 2024-09-26. 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-Réservoir de L'Astarac 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-Réservoir de L'Astarac
These are the measurements Eau France publishes for Barrage-Réservoir de L'Astarac. More on the source.
Murky, only visible to about 3.8 ft. Phosphorus 20 µg/L. Chlorophyll-a 4 µg/L. TSI 50.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 1.16m | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 20µg/L | Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. |
| Chlorophyll-a (algae) | 4µg/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. | 50 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
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Frequently asked questions about Barrage-Réservoir de L'Astarac
Where is Barrage-Réservoir de L'Astarac?
- Barrage-Réservoir de L'Astarac is a lake in Gers, France. This page reports official water-quality measurements, shown as reported.
What is the water quality of Barrage-Réservoir de L'Astarac?
- Barrage-Réservoir de L'Astarac in Gers, France has official water-quality measurements, shown as reported. Water clarity: 1.2 m visibility. Phosphorus: 20 µg/L. Chlorophyll-a (algae): 4 µg/L.
Is Barrage-Réservoir de L'Astarac safe to swim in?
- Barrage-Réservoir de L'Astarac 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
53 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-fr53 samples · —
Analytical methods
- Hub'Eau / Naïades plans d'eau
Monitoring station identifiers (1)
O60-4003
Authority classifications are shown as the authority published them. See where the data comes from and data sources.