COLUMBIA--BLO ROCK ISLAND DAM (RISW1)
| Observed | Forecast/Trend Issued: 2026-04-02 09:13 PDT | ||
| Date/Time (PDT) | Pool Height | Date/Time (PDT) | Pool Height |
| 2026-04-02 00:00 | 611.71 | 2026-04-02 23:00 | 611.36 |
| 2026-04-01 00:00 | 612.41 | 2026-04-03 05:00 | 611.36 |
| 2026-03-31 00:00 | 612.55 | 2026-04-03 11:00 | 611.36 |
| 2026-03-30 00:00 | 611.77 | 2026-04-03 17:00 | 611.36 |
| 2026-03-29 00:00 | 612.29 | 2026-04-03 23:00 | 611.36 |
| 2026-03-28 00:00 | 612.5 | 2026-04-04 05:00 | 611.36 |
| 2026-03-27 00:00 | 612.68 | 2026-04-04 11:00 | 611.36 |
| 2026-03-26 00:00 | 612.61 | 2026-04-04 17:00 | 611.36 |
| 2026-03-25 00:00 | 612.38 | 2026-04-04 23:00 | 611.36 |
| 2026-03-24 00:00 | 612.71 | 2026-04-05 05:00 | 611.36 |
| 2026-03-23 00:00 | 612.06 | 2026-04-05 11:00 | 611.36 |
| 2026-04-05 17:00 | 611.36 | ||
| 2026-04-05 23:00 | 611.36 | ||
| 2026-04-06 05:00 | 611.36 | ||
| 2026-04-06 11:00 | 611.36 | ||
| 2026-04-06 17:00 | 611.36 | ||
| 2026-04-06 23:00 | 611.36 | ||
| 2026-04-07 05:00 | 611.36 | ||
| 2026-04-07 11:00 | 611.36 | ||
| 2026-04-07 17:00 | 611.36 | ||
| 2026-04-07 23:00 | 611.36 | ||
| 2026-04-08 05:00 | 611.36 | ||
| 2026-04-08 11:00 | 611.36 | ||
| 2026-04-08 17:00 | 611.36 | ||
| 2026-04-08 23:00 | 611.36 | ||
| 2026-04-09 05:00 | 611.36 | ||
| 2026-04-09 11:00 | 611.36 | ||
| 2026-04-09 17:00 | 611.36 | ||
| 2026-04-09 23:00 | 611.36 | ||
| 2026-04-10 05:00 | 611.36 | ||
| 2026-04-10 11:00 | 611.36 | ||
| 2026-04-10 17:00 | 611.36 | ||
| 2026-04-10 23:00 | 611.36 | ||
| 2026-04-11 05:00 | 611.36 | ||
| 2026-04-11 11:00 | 611.36 | ||
| 2026-04-11 17:00 | 611.36 | ||
| 2026-04-11 23:00 | 611.36 | ||
| 2026-04-12 05:00 | 611.36 | ||