COLUMBIA--BLO ROCK ISLAND DAM (RISW1)
| Observed | Forecast/Trend Issued: 2026-01-27 09:28 PST | ||
| Date/Time (PST) | Pool Height | Date/Time (PST) | Pool Height |
| 2026-01-27 00:00 | 612.23 | 2026-01-27 22:00 | 612.08 |
| 2026-01-26 00:00 | 612.03 | 2026-01-28 04:00 | 612.08 |
| 2026-01-25 00:00 | 611.92 | 2026-01-28 10:00 | 612.08 |
| 2026-01-24 00:00 | 611.67 | 2026-01-28 16:00 | 612.08 |
| 2026-01-23 00:00 | 611.51 | 2026-01-28 22:00 | 612.08 |
| 2026-01-22 00:00 | 611.81 | 2026-01-29 04:00 | 612.08 |
| 2026-01-21 00:00 | 611.67 | 2026-01-29 10:00 | 612.08 |
| 2026-01-20 00:00 | 612.06 | 2026-01-29 16:00 | 612.08 |
| 2026-01-19 00:00 | 612.18 | 2026-01-29 22:00 | 612.08 |
| 2026-01-18 00:00 | 611.38 | 2026-01-30 04:00 | 612.08 |
| 2026-01-17 00:00 | 611.93 | 2026-01-30 10:00 | 612.08 |
| 2026-01-30 16:00 | 612.08 | ||
| 2026-01-30 22:00 | 612.08 | ||
| 2026-01-31 04:00 | 612.08 | ||
| 2026-01-31 10:00 | 612.08 | ||
| 2026-01-31 16:00 | 612.08 | ||
| 2026-01-31 22:00 | 612.08 | ||
| 2026-02-01 04:00 | 612.08 | ||
| 2026-02-01 10:00 | 612.08 | ||
| 2026-02-01 16:00 | 612.08 | ||
| 2026-02-01 22:00 | 612.08 | ||
| 2026-02-02 04:00 | 612.08 | ||
| 2026-02-02 10:00 | 612.08 | ||
| 2026-02-02 16:00 | 612.08 | ||
| 2026-02-02 22:00 | 612.08 | ||
| 2026-02-03 04:00 | 612.08 | ||
| 2026-02-03 10:00 | 612.08 | ||
| 2026-02-03 16:00 | 612.08 | ||
| 2026-02-03 22:00 | 612.08 | ||
| 2026-02-04 04:00 | 612.08 | ||
| 2026-02-04 10:00 | 612.08 | ||
| 2026-02-04 16:00 | 612.08 | ||
| 2026-02-04 22:00 | 612.08 | ||
| 2026-02-05 04:00 | 612.08 | ||
| 2026-02-05 10:00 | 612.08 | ||
| 2026-02-05 16:00 | 612.08 | ||
| 2026-02-05 22:00 | 612.08 | ||
| 2026-02-06 04:00 | 612.08 | ||