Iwate, Japan
County page for 10 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 |
|---|---|---|---|---|---|
| 世増ダム貯水池 | Iwate | 59 µg/L | — | 1.8 m | 2024 |
| 入畑ダム貯水池 | Iwate | 9.0 µg/L | — | 2.4 m | 2025 |
| 四十四田ダム貯水池 | Iwate | 26 µg/L | — | 2.1 m | 2025 |
| 岩洞ダム貯水池 | Iwate | 9.0 µg/L | — | 3.4 m | 2024 |
| 御所ダム貯水池 | Iwate | 10 µg/L | — | 2.5 m | 2025 |
| 早池峰ダム貯水池 | Iwate | 11 µg/L | — | 2.5 m | 2025 |
| 湯田ダム貯水池 | Iwate | 13 µg/L | — | 1.8 m | 2025 |
| 田瀬ダム貯水池 | Iwate | 13 µg/L | — | 3.5 m | 2025 |
| 綱取ダム貯水池 | Iwate | 12 µg/L | — | 3.4 m | 2025 |
| 豊沢ダム貯水池 | Iwate | 12 µg/L | — | 2.0 m | 2024 |
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