Barrage des Montagnès
Barrage des Montagnès in Tarn, France has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 2.9 m visibility. Phosphorus: 13 µg/L. Chlorophyll-a (algae): 4.6 µg/L.
- Clarity
- 2.9 m
Why Barrage des Montagnès has no A–F grade
Barrage des Montagnès 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 des Montagnès is a lake in Tarn County, France.
Source: the French water agencies, via UNEP GEMS/Water — not the EPA Water Quality Portal, last sampled 2022-10-04. 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 des Montagnès
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Moderate clarity, visible to about 9.5 ft. Phosphorus level: 13 µg/L. Chlorophyll-a: 4.6 µg/L. Trophic State Index: 44.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.9 m | Not graded |
| Phosphorus | 13 µg/L | Not graded |
| Chlorophyll-a (Algae) | 4.6 µg/L | Not graded |
| Trophic State Index (TSI) | 44 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Barrage des Montagnès
Compare lakeside cabins, hotels, and vacation rentals near Barrage des Montagnès in Tarn, 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 des Montagnès
Frequently asked questions about Barrage des Montagnès
What is the water quality of Barrage des Montagnès?
- Barrage des Montagnès in Tarn, France has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 2.9 m visibility. Phosphorus: 13 µg/L. Chlorophyll-a (algae): 4.6 µg/L.
Is Barrage des Montagnès safe to swim in?
- Barrage des Montagnès 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, 2022. 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)
O4375003
Authority classifications are stored separately from LakeQuality A–F letters and are never blended. See how grades are calculated and data sources.