Where is Barrage du Louet?

Barrage du Louet is a lake in Hautes-Pyrénées, France. This page reports official water-quality measurements, shown as reported.

Is Barrage du Louet safe to swim in?

Barrage du Louet 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.

Barrage du Louet

Hautes-Pyrénées, FranceView map Directions

Eau France publishes the water-quality measurements for Barrage du Louet. Here is what has been measured.

Clarity

2.5 m

Typical for France

Secchi · sampled 2022

Phosphorus

16.5 µg/L

Less phosphorus than most

Measured by Eau France

Chlorophyll-a

3.4 µg/L

Typical for France

Measured by Eau France

Limited data

See the measurements Directions Where to stay

Barrage du Louet in Hautes-Pyrénées, France has official water-quality measurements, shown as reported. Water clarity: 2.5 m visibility. Phosphorus: 16.5 µg/L. Chlorophyll-a (algae): 3.4 µg/L.

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How Barrage du Louet is classified

Barrage du Louet in France is published with the authority's own measurements and class. The measurements here are published by the agency that samples the lake, as reported. Sampling here has recorded water clarity, phosphorus and algae (chlorophyll-a).

LakeQuality publishes no grade of its own beside it. Everything below thathas been measured is reported on this page.

Monitoring: the French water agencies, via UNEP GEMS/Water.

Barrage du Louet 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 2022-10-04. Methodology: how these readings are compared.

Swimming conditions

No reading

Limited data

Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.

Whether Barrage du Louet is safe to swim in today is a call for the French water agencies, via UNEP GEMS/Water and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.

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Water quality measurements for Barrage du Louet

These are the measurements Eau France publishes for Barrage du Louet. More on the source.

Moderate clarity, visible to about 8 ft. Phosphorus 16.5 µg/L. Chlorophyll-a 3.4 µg/L. TSI 45.

Water quality readings
Measure	Reading	Where it sits
Water clarity (Secchi depth)	2.45m	Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer.
Total phosphorus	16.5µg/L	Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential.
Chlorophyll-a (algae)	3.4µg/L	Measured, not scored The green pigment in algae — a direct measure of how much algae is in the water.
Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a.	45	Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic

Moderate nutrients, good water quality

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Fishing Barrage du Louet

→ Barrage du Louet fishing regulations (limits, seasons, special rules)

Frequently asked questions about Barrage du Louet

Where is Barrage du Louet?: Barrage du Louet is a lake in Hautes-Pyrénées, France. This page reports official water-quality measurements, shown as reported.
What is the water quality of Barrage du Louet?: Barrage du Louet in Hautes-Pyrénées, France has official water-quality measurements, shown as reported. Water clarity: 2.5 m visibility. Phosphorus: 16.5 µg/L. Chlorophyll-a (algae): 3.4 µg/L.
Is Barrage du Louet safe to swim in?: Barrage du Louet 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, 2019–2022. 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)

Q0405003

Authority classifications are shown as the authority published them. See where the data comes from and data sources.