Lakes in Yonne, France
Find lakes in Yonne: county page for 1 named lakes in France. Official surface phosphorus, chlorophyll-a, and Secchi — not a swim-safety class and not a LakeQuality letter.
Lake map
Loading map…
Named lakes
| Lake | Place | Total phosphorus | Chlorophyll-a | Secchi | Year |
|---|---|---|---|---|---|
| Barrage du Bourdon | Yonne | — | 8.0 µg/L | 1.4 m | 2026 |
Frequently asked questions
- How many named lakes are in Yonne?
- 1 named lakes in Yonne, France, have official chlorophyll-a and Secchi, 2026. Values are measurements, not a LakeQuality A–F grade.
- Does LakeQuality grade lakes in Yonne?
- No. Yonne pages show official phosphorus, chlorophyll-a, and Secchi from the publishing authority. A letter on the LakeQuality scale would be an invention.