Barrage du Crescent
Nièvre, FranceView mapDirections
Eau France publishes the water-quality measurements for Barrage du Crescent. Here is what has been measured.
- Limited data
Barrage du Crescent in Nièvre, France has official water-quality measurements, shown as reported. Water clarity: 1.6 m visibility. Chlorophyll-a (algae): 8 µg/L.
How Barrage du Crescent is classified
Barrage du Crescent 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 du Crescent is a lake in Nièvre County, France.
Source: the French water agencies, via UNEP GEMS/Water — not the EPA Water Quality Portal, last sampled 2026-05-20. Methodology: how these readings are compared.
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Barrage du Crescent 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.
Water quality measurements for Barrage du Crescent
These are the measurements Eau France publishes for Barrage du Crescent. More on the source.
Murky, only visible to about 5.1 ft. Chlorophyll-a 8 µg/L. TSI 52.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 1.55m | 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) | 8µg/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. | 52 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
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Answers come straight from the public measurements and survey records on this page.
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Frequently asked questions about Barrage du Crescent
Where is Barrage du Crescent?
- Barrage du Crescent is a lake in Nièvre, France. This page reports official water-quality measurements, shown as reported.
What is the water quality of Barrage du Crescent?
- Barrage du Crescent in Nièvre, France has official water-quality measurements, shown as reported. Water clarity: 1.6 m visibility. Chlorophyll-a (algae): 8 µg/L.
Is Barrage du Crescent safe to swim in?
- Barrage du Crescent 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, 2020–2026. 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)
F31-4443
Authority classifications are shown as the authority published them. See where the data comes from and data sources.