Lac de Cap de Long
Lac de Cap de Long in Hautes-Pyrénées, France has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 9.8 m visibility. Chlorophyll-a (algae): 1 µg/L.
- Clarity
- 9.8 m
Why Lac de Cap de Long has no A–F grade
Lac de Cap de Long 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.
Lac de Cap de Long 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 2024-10-08. 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 Lac de Cap de Long
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Crystal clear, you can see 32 ft down. Chlorophyll-a: 1 µg/L. Trophic State Index: 29.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 9.75 m | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | 1 µg/L | Not graded |
| Trophic State Index (TSI) | 29 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near Lac de Cap de Long
Compare lakeside cabins, hotels, and vacation rentals near Lac de Cap de Long in Hautes-Pyrénées, 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 Lac de Cap de Long
Frequently asked questions about Lac de Cap de Long
What is the water quality of Lac de Cap de Long?
- Lac de Cap de Long in Hautes-Pyrénées, France has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 9.8 m visibility. Chlorophyll-a (algae): 1 µg/L.
Is Lac de Cap de Long safe to swim in?
- Lac de Cap de Long 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.
Explore Lac de Cap de Long across LakeGrade
More lakes in France
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)
O0115193
Authority classifications are stored separately from LakeQuality A–F letters and are never blended. See how grades are calculated and data sources.