| 八ッ場ダム | 05/15 |
| 貯水率(%) | |
| 12時間履歴 | ||
| 04:00 | 88.8 | ▼ |
| 03:00 | 88.9 | - |
| 02:00 | 88.9 | ▼ |
| 01:00 | 89.0 | ▼ |
| 00:00 | 89.1 | - |
| 23:00 | 89.1 | ▼ |
| 22:00 | 89.2 | - |
| 21:00 | 89.2 | ▼ |
| 20:00 | 89.3 | ▼ |
| 19:00 | 89.4 | - |
| 18:00 | 89.4 | ▼ |
| 17:00 | 89.5 | ▼ |
| 2時間履歴(10分) | ||
| 04:10 | 88.8 | - |
| 04:00 | 88.8 | - |
| 03:50 | 88.8 | - |
| 03:40 | 88.8 | - |
| 03:30 | 88.8 | - |
| 03:20 | 88.8 | - |
| 03:10 | 88.8 | ▼ |
| 03:00 | 88.9 | - |
| 02:50 | 88.9 | - |
| 02:40 | 88.9 | - |
| 02:30 | 88.9 | - |
| 02:20 | 88.9 | - |