Barrage de Grandval
Barrage de Grandval in Cantal, France has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 3.4 m visibility. Chlorophyll-a (algae): 1 µg/L.
- Clarity
- 3.4 m
Why Barrage de Grandval has no A–F grade
Barrage de Grandval 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 Grandval is a lake in Cantal County, France.
Source: the French water agencies, via UNEP GEMS/Water — not the EPA Water Quality Portal, last sampled 2022-10-05. 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 Grandval
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Good clarity, visible to about 11 ft. Chlorophyll-a: 1 µg/L. Trophic State Index: 37.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3.35 m | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | 1 µg/L | Not graded |
| Trophic State Index (TSI) | 37 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near Barrage de Grandval
Compare lakeside cabins, hotels, and vacation rentals near Barrage de Grandval in Cantal, 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 Grandval
Frequently asked questions about Barrage de Grandval
What is the water quality of Barrage de Grandval?
- Barrage de Grandval in Cantal, France has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 3.4 m visibility. Chlorophyll-a (algae): 1 µg/L.
Is Barrage de Grandval safe to swim in?
- Barrage de Grandval 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
48 measurements from 1 monitoring station, 2016–2022. 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-fr48 samples · —
Analytical methods
- Hub'Eau / Naïades plans d'eau
Monitoring station identifiers (1)
O7--3003
Authority classifications are stored separately from LakeQuality A–F letters and are never blended. See how grades are calculated and data sources.