Where is Retenue de L'Angle Guignard?

Retenue de L'Angle Guignard is a lake in Vendée, France. This page reports official water-quality measurements, shown as reported.

Is Retenue de L'Angle Guignard safe to swim in?

Retenue de L'Angle Guignard 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.

Retenue de L'Angle Guignard

Vendée, FranceView map Directions

Eau France publishes the water-quality measurements for Retenue de L'Angle Guignard. Here is what has been measured.

Clarity

1.3 m

Typical for France

Secchi · sampled 2025

Phosphorus

15 µg/L

Less phosphorus than most

Measured by Eau France

Chlorophyll-a

9.6 µg/L

Typical for France

Measured by Eau France

Limited data

See the measurements Directions Where to stay

Retenue de L'Angle Guignard in Vendée, France has official water-quality measurements, shown as reported. Water clarity: 1.3 m visibility. Phosphorus: 15 µg/L. Chlorophyll-a (algae): 9.6 µg/L.

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How Retenue de L'Angle Guignard is classified

Retenue de L'Angle Guignard 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.

Retenue de L'Angle Guignard is a lake in Vendée County, France.

Source: the French water agencies, via UNEP GEMS/Water — not the EPA Water Quality Portal, last sampled 2025-10-01. 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 Retenue de L'Angle Guignard 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 Retenue de L'Angle Guignard

These are the measurements Eau France publishes for Retenue de L'Angle Guignard. More on the source.

Murky, only visible to about 4.1 ft. Phosphorus 15 µg/L. Chlorophyll-a 9.6 µg/L. TSI 51.

Water quality readings
Measure	Reading	Where it sits
Water clarity (Secchi depth)	1.25m	Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer.
Total phosphorus	15µg/L	Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential.
Chlorophyll-a (algae)	9.6µg/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.	51	Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic

High nutrients, frequent algae, reduced clarity

Ask about Retenue de L'Angle Guignard

Answers come straight from the public measurements and survey records on this page.

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Fishing Retenue de L'Angle Guignard

→ Retenue de L'Angle Guignard fishing regulations (limits, seasons, special rules)

Frequently asked questions about Retenue de L'Angle Guignard

Where is Retenue de L'Angle Guignard?: Retenue de L'Angle Guignard is a lake in Vendée, France. This page reports official water-quality measurements, shown as reported.
What is the water quality of Retenue de L'Angle Guignard?: Retenue de L'Angle Guignard in Vendée, France has official water-quality measurements, shown as reported. Water clarity: 1.3 m visibility. Phosphorus: 15 µg/L. Chlorophyll-a (algae): 9.6 µg/L.
Is Retenue de L'Angle Guignard safe to swim in?: Retenue de L'Angle Guignard 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 Retenue de L'Angle Guignard across LakeQuality

Lake Fishing Forecast

Species activity outlook by water temperature and season

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EU bathing ratings and named-lake measurements

Where this data comes from

40 measurements from 1 monitoring station, 2016–2025. 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)

N303510

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