Nagano, Japan
County page for 14 named lakes in Japan. Official surface phosphorus, chlorophyll-a, and Secchi — not a swim-safety class and not a LakeQuality letter.
Lake map
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Named lakes
| Lake | Place | Total phosphorus | Chlorophyll-a | Secchi | Year |
|---|---|---|---|---|---|
| みどり湖 | Nagano | 26 µg/L | — | — | 2024 |
| 中綱湖 | Nagano | 9.0 µg/L | — | — | 2024 |
| 味噌川ダム貯水池 | Nagano | 7.0 µg/L | — | 8.6 m | 2025 |
| 大座法師池 | Nagano | 16 µg/L | — | — | 2024 |
| 女神湖 | Nagano | 14 µg/L | — | — | 2024 |
| 木崎湖 | Nagano | 7.0 µg/L | — | 5.7 m | 2024 |
| 猪名湖 | Nagano | 14 µg/L | — | — | 2024 |
| 琵琶池 | Nagano | 31 µg/L | — | — | 2024 |
| 白樺湖 | Nagano | 21 µg/L | — | — | 2024 |
| 美鈴湖 | Nagano | 12 µg/L | — | — | 2024 |
| 蓼科湖 | Nagano | 32 µg/L | — | — | 2024 |
| 諏訪湖 | Nagano | 39 µg/L | — | 1.1 m | 2025 |
| 野尻湖 | Nagano | 5.0 µg/L | — | 6.3 m | 2025 |
| 青木湖 | Nagano | 4.0 µg/L | — | — | 2024 |
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