Where is Barrage des Montagnès?

Barrage des Montagnès is a lake in Tarn, France. This page reports official water-quality measurements, shown as reported.

Is Barrage des Montagnès safe to swim in?

Barrage des Montagnès 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 des Montagnès

Tarn, FranceView map Directions

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

Clarity

2.9 m

Clearer than most

Secchi · sampled 2022

Phosphorus

13 µg/L

Less phosphorus than most

Measured by Eau France

Chlorophyll-a

4.6 µg/L

Typical for France

Measured by Eau France

Limited data

See the measurements Directions Where to stay

Barrage des Montagnès in Tarn, France has official water-quality measurements, shown as reported. Water clarity: 2.9 m visibility. Phosphorus: 13 µg/L. Chlorophyll-a (algae): 4.6 µg/L.

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How Barrage des Montagnès is classified

Barrage des Montagnès 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 des Montagnès is a lake in Tarn 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 des Montagnès 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 des Montagnès

These are the measurements Eau France publishes for Barrage des Montagnès. More on the source.

Moderate clarity, visible to about 9.5 ft. Phosphorus 13 µg/L. Chlorophyll-a 4.6 µg/L. TSI 44.

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	13µg/L	Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential.
Chlorophyll-a (algae)	4.6µg/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.	44	Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic

Moderate nutrients, good water quality

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Fishing Barrage des Montagnès

→ Barrage des Montagnès fishing regulations (limits, seasons, special rules)

Frequently asked questions about Barrage des Montagnès

Where is Barrage des Montagnès?: Barrage des Montagnès is a lake in Tarn, France. This page reports official water-quality measurements, shown as reported.
What is the water quality of Barrage des Montagnès?: Barrage des Montagnès in Tarn, France has official water-quality measurements, shown as reported. Water clarity: 2.9 m visibility. Phosphorus: 13 µg/L. Chlorophyll-a (algae): 4.6 µg/L.
Is Barrage des Montagnès safe to swim in?: Barrage des Montagnès 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

20 measurements from 1 monitoring station, 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-fr20 samples · —

Analytical methods

Hub'Eau / Naïades plans d'eau

Monitoring station identifiers (1)

O4375003

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