COLUMBIA--GRAND COULEE DAM (GCDW1)
| Observed | Forecast/Trend Issued: 2026-11-02 08:27 PST | ||
| Date/Time (PST) | Pool Height | Date/Time (PST) | Pool Height |
| 2026-11-02 00:00 | 1288.55 | 2026-11-02 22:00 | 1288.9 |
| 2026-11-01 00:00 | 1288.4 | 2026-11-03 04:00 | 1288.9 |
| 2026-10-30 23:00 | 1288.55 | 2026-11-03 10:00 | 1288.87 |
| 2026-10-29 23:00 | 1288.65 | 2026-11-03 16:00 | 1288.81 |
| 2026-10-28 23:00 | 1288.69 | 2026-11-03 22:00 | 1288.71 |
| 2026-10-27 23:00 | 1288.64 | 2026-11-04 04:00 | 1288.57 |
| 2026-10-26 23:00 | 1288.29 | 2026-11-04 10:00 | 1288.42 |
| 2026-10-25 23:00 | 1288.03 | 2026-11-04 16:00 | 1288.26 |
| 2026-10-24 23:00 | 1287.76 | 2026-11-04 22:00 | 1288.11 |
| 2026-10-23 23:00 | 1287.52 | 2026-11-05 04:00 | 1287.96 |
| 2026-10-22 23:00 | 1287.37 | 2026-11-05 10:00 | 1287.81 |
| 2026-11-05 16:00 | 1287.66 | ||
| 2026-11-05 22:00 | 1287.51 | ||
| 2026-11-06 04:00 | 1287.35 | ||
| 2026-11-06 10:00 | 1287.2 | ||
| 2026-11-06 16:00 | 1287.05 | ||
| 2026-11-06 22:00 | 1286.9 | ||
| 2026-11-07 04:00 | 1286.74 | ||
| 2026-11-07 10:00 | 1286.59 | ||
| 2026-11-07 16:00 | 1286.44 | ||
| 2026-11-07 22:00 | 1286.29 | ||
| 2026-11-08 04:00 | 1286.14 | ||
| 2026-11-08 10:00 | 1285.99 | ||
| 2026-11-08 16:00 | 1285.85 | ||
| 2026-11-08 22:00 | 1285.71 | ||
| 2026-11-09 04:00 | 1285.57 | ||
| 2026-11-09 10:00 | 1285.43 | ||
| 2026-11-09 16:00 | 1285.3 | ||
| 2026-11-09 22:00 | 1285.17 | ||
| 2026-11-10 04:00 | 1285.04 | ||
| 2026-11-10 10:00 | 1284.91 | ||
| 2026-11-10 16:00 | 1284.78 | ||
| 2026-11-10 22:00 | 1284.66 | ||
| 2026-11-11 04:00 | 1284.54 | ||
| 2026-11-11 10:00 | 1284.41 | ||
| 2026-11-11 16:00 | 1284.29 | ||
| 2026-11-11 22:00 | 1284.18 | ||
| 2026-11-12 04:00 | 1284.06 | ||