COLUMBIA--BLO ROCK ISLAND DAM (RISW1)
| Observed | Forecast/Trend Issued: 2026-08-09 09:48 PDT | ||
| Date/Time (PDT) | Pool Height | Date/Time (PDT) | Pool Height |
| 2026-08-09 00:00 | 612.07 | 2026-08-09 17:00 | 611.85 |
| 2026-08-08 00:00 | 612.13 | 2026-08-09 23:00 | 611.85 |
| 2026-08-07 00:00 | 611.99 | 2026-08-10 05:00 | 611.85 |
| 2026-08-06 00:00 | 611.98 | 2026-08-10 11:00 | 611.85 |
| 2026-08-05 00:00 | 611.98 | 2026-08-10 17:00 | 611.85 |
| 2026-08-04 00:00 | 612.02 | 2026-08-10 23:00 | 611.85 |
| 2026-08-03 00:00 | 612.18 | 2026-08-11 05:00 | 611.85 |
| 2026-08-02 00:00 | 611.92 | 2026-08-11 11:00 | 611.85 |
| 2026-08-01 00:00 | 611.99 | 2026-08-11 17:00 | 611.85 |
| 2026-07-31 00:00 | 612.09 | 2026-08-11 23:00 | 611.85 |
| 2026-07-30 00:00 | 612.16 | 2026-08-12 05:00 | 611.85 |
| 2026-08-12 11:00 | 611.85 | ||
| 2026-08-12 17:00 | 611.85 | ||
| 2026-08-12 23:00 | 611.85 | ||
| 2026-08-13 05:00 | 611.85 | ||
| 2026-08-13 11:00 | 611.85 | ||
| 2026-08-13 17:00 | 611.85 | ||
| 2026-08-13 23:00 | 611.85 | ||
| 2026-08-14 05:00 | 611.85 | ||
| 2026-08-14 11:00 | 611.85 | ||
| 2026-08-14 17:00 | 611.85 | ||
| 2026-08-14 23:00 | 611.85 | ||
| 2026-08-15 05:00 | 611.85 | ||
| 2026-08-15 11:00 | 611.85 | ||
| 2026-08-15 17:00 | 611.85 | ||
| 2026-08-15 23:00 | 611.85 | ||
| 2026-08-16 05:00 | 611.85 | ||
| 2026-08-16 11:00 | 611.85 | ||
| 2026-08-16 17:00 | 611.85 | ||
| 2026-08-16 23:00 | 611.85 | ||
| 2026-08-17 05:00 | 611.85 | ||
| 2026-08-17 11:00 | 611.85 | ||
| 2026-08-17 17:00 | 611.85 | ||
| 2026-08-17 23:00 | 611.85 | ||
| 2026-08-18 05:00 | 611.85 | ||
| 2026-08-18 11:00 | 611.85 | ||
| 2026-08-18 17:00 | 611.85 | ||
| 2026-08-18 23:00 | 611.85 | ||
| 2026-08-19 05:00 | 611.85 | ||