Where is Barrage de Castelnau-Lassouts?

Barrage de Castelnau-Lassouts is a lake in Aveyron, France. This page reports official water-quality measurements, shown as reported.

Is Barrage de Castelnau-Lassouts safe to swim in?

Barrage de Castelnau-Lassouts 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 de Castelnau-Lassouts

Aveyron, FranceView map Directions

Eau France publishes the water-quality measurements for Barrage de Castelnau-Lassouts. Here is what has been measured.

Clarity

2.9 m

Clearer than most

Secchi · sampled 2022

Chlorophyll-a

1.4 µg/L

Less algae than most

Measured by Eau France

Limited data

See the measurements Directions Where to stay

Barrage de Castelnau-Lassouts in Aveyron, France has official water-quality measurements, shown as reported. Water clarity: 2.9 m visibility. Chlorophyll-a (algae): 1.4 µg/L.

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How Barrage de Castelnau-Lassouts is classified

Barrage de Castelnau-Lassouts 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 and algae (chlorophyll-a), but not phosphorus.

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 de Castelnau-Lassouts is a lake in Aveyron County, France.

Source: the French water agencies, via UNEP GEMS/Water — not the EPA Water Quality Portal, last sampled 2022-10-10. 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 de Castelnau-Lassouts 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 de Castelnau-Lassouts

These are the measurements Eau France publishes for Barrage de Castelnau-Lassouts. More on the source.

Moderate clarity, visible to about 9.5 ft. Chlorophyll-a 1.4 µg/L. TSI 39.

Water quality readings
Measure	Reading	Where it sits
Water clarity (Secchi depth)	2.9m	Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer.
Total phosphorus		No reading The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential.
Chlorophyll-a (algae)	1.4µg/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.	39	Oligotrophic OligotrophicMesotrophicEutrophicHypereutrophic

Low nutrients, clear water. No reading is a swimming clearance.

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Fishing Barrage de Castelnau-Lassouts

→ Barrage de Castelnau-Lassouts fishing regulations (limits, seasons, special rules)

Frequently asked questions about Barrage de Castelnau-Lassouts

Where is Barrage de Castelnau-Lassouts?: Barrage de Castelnau-Lassouts is a lake in Aveyron, France. This page reports official water-quality measurements, shown as reported.
What is the water quality of Barrage de Castelnau-Lassouts?: Barrage de Castelnau-Lassouts in Aveyron, France has official water-quality measurements, shown as reported. Water clarity: 2.9 m visibility. Chlorophyll-a (algae): 1.4 µg/L.
Is Barrage de Castelnau-Lassouts safe to swim in?: Barrage de Castelnau-Lassouts 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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Species activity outlook by water temperature and season

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EU bathing ratings and named-lake measurements

Where this data comes from

32 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-fr32 samples · —

Analytical methods

Hub'Eau / Naïades plans d'eau

Monitoring station identifiers (1)

O72-5023

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