Barrage de L'Arrêt Darré
Barrage de L'Arrêt Darré in Hautes-Pyrénées, France has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 2.3 m visibility. Phosphorus: 18.5 µg/L. Chlorophyll-a (algae): 2 µg/L.
- Clarity
- 2.3 m
Why Barrage de L'Arrêt Darré has no A–F grade
Barrage de L'Arrêt Darré 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 water clarity, phosphorus and algae (chlorophyll-a).
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.
Barrage de L'Arrêt Darré is a lake in Hautes-Pyrénées County, France.
Source: the French water agencies, via UNEP GEMS/Water — not the EPA Water Quality Portal, last sampled 2021-09-27. 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 Barrage de L'Arrêt Darré
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Moderate clarity, visible to about 7.6 ft. Phosphorus level: 18.5 µg/L. Chlorophyll-a: 2 µg/L. Trophic State Index: 44.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.33 m | Not graded |
| Phosphorus | 18.5 µg/L | Not graded |
| Chlorophyll-a (Algae) | 2 µg/L | Not graded |
| Trophic State Index (TSI) | 44 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Barrage de L'Arrêt Darré
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Fishing Barrage de L'Arrêt Darré
Frequently asked questions about Barrage de L'Arrêt Darré
What is the water quality of Barrage de L'Arrêt Darré?
- Barrage de L'Arrêt Darré in Hautes-Pyrénées, France has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 2.3 m visibility. Phosphorus: 18.5 µg/L. Chlorophyll-a (algae): 2 µg/L.
Is Barrage de L'Arrêt Darré safe to swim in?
- Barrage de L'Arrêt Darré 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
52 measurements from 1 monitoring station, 2018–2021. 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-fr52 samples · —
Analytical methods
- Hub'Eau / Naïades plans d'eau
Monitoring station identifiers (1)
Q0555003
Authority classifications are stored separately from LakeQuality A–F letters and are never blended. See how grades are calculated and data sources.