COLUMBIA--BLO ROCK ISLAND DAM (RISW1)
| Observed | Forecast/Trend Issued: 2026-04-14 16:54 PDT | ||
| Date/Time (PDT) | Pool Height | Date/Time (PDT) | Pool Height |
| 2026-04-14 00:00 | 611.88 | 2026-04-14 23:00 | 612.26 |
| 2026-04-13 00:00 | 612.21 | 2026-04-15 05:00 | 612.26 |
| 2026-04-12 00:00 | 611.78 | 2026-04-15 11:00 | 612.26 |
| 2026-04-11 00:00 | 612.01 | 2026-04-15 17:00 | 612.26 |
| 2026-04-10 00:00 | 611.82 | 2026-04-15 23:00 | 612.26 |
| 2026-04-09 00:00 | 611.44 | 2026-04-16 05:00 | 612.26 |
| 2026-04-08 00:00 | 611.85 | 2026-04-16 11:00 | 612.26 |
| 2026-04-07 00:00 | 611.73 | 2026-04-16 17:00 | 612.26 |
| 2026-04-06 00:00 | 611.84 | 2026-04-16 23:00 | 612.26 |
| 2026-04-05 00:00 | 611.75 | 2026-04-17 05:00 | 612.26 |
| 2026-04-04 00:00 | 611.79 | 2026-04-17 11:00 | 612.26 |
| 2026-04-17 17:00 | 612.26 | ||
| 2026-04-17 23:00 | 612.26 | ||
| 2026-04-18 05:00 | 612.26 | ||
| 2026-04-18 11:00 | 612.26 | ||
| 2026-04-18 17:00 | 612.26 | ||
| 2026-04-18 23:00 | 612.26 | ||
| 2026-04-19 05:00 | 612.26 | ||
| 2026-04-19 11:00 | 612.26 | ||
| 2026-04-19 17:00 | 612.26 | ||
| 2026-04-19 23:00 | 612.26 | ||
| 2026-04-20 05:00 | 612.26 | ||
| 2026-04-20 11:00 | 612.26 | ||
| 2026-04-20 17:00 | 612.26 | ||
| 2026-04-20 23:00 | 612.26 | ||
| 2026-04-21 05:00 | 612.26 | ||
| 2026-04-21 11:00 | 612.26 | ||
| 2026-04-21 17:00 | 612.26 | ||
| 2026-04-21 23:00 | 612.26 | ||
| 2026-04-22 05:00 | 612.26 | ||
| 2026-04-22 11:00 | 612.26 | ||
| 2026-04-22 17:00 | 612.26 | ||
| 2026-04-22 23:00 | 612.26 | ||
| 2026-04-23 05:00 | 612.26 | ||
| 2026-04-23 11:00 | 612.26 | ||
| 2026-04-23 17:00 | 612.26 | ||
| 2026-04-23 23:00 | 612.26 | ||
| 2026-04-24 05:00 | 612.26 | ||