Barrage de Montbel
Barrage de Montbel in Ariège, France has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 2.3 m visibility. Chlorophyll-a (algae): 1.8 µg/L.
- Clarity
- 2.3 m
Why Barrage de Montbel has no A–F grade
Barrage de Montbel 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 and algae (chlorophyll-a), but not phosphorus.
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 Montbel is a lake in Ariège County, France.
Source: the French water agencies, via UNEP GEMS/Water — not the EPA Water Quality Portal, last sampled 2024-09-26. 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 Montbel
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Moderate clarity, visible to about 7.5 ft. Chlorophyll-a: 1.8 µg/L. Trophic State Index: 42.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.3 m | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | 1.8 µg/L | Not graded |
| Trophic State Index (TSI) | 42 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Barrage de Montbel
Compare lakeside cabins, hotels, and vacation rentals near Barrage de Montbel in Ariège, France — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
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Fishing Barrage de Montbel
Frequently asked questions about Barrage de Montbel
What is the water quality of Barrage de Montbel?
- Barrage de Montbel in Ariège, France has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 2.3 m visibility. Chlorophyll-a (algae): 1.8 µg/L.
Is Barrage de Montbel safe to swim in?
- Barrage de Montbel 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
40 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-fr40 samples · —
Analytical methods
- Hub'Eau / Naïades plans d'eau
Monitoring station identifiers (1)
O1475023
Authority classifications are stored separately from LakeQuality A–F letters and are never blended. See how grades are calculated and data sources.