COLUMBIA--GRAND COULEE DAM (GCDW1)
| Observed | Forecast/Trend Issued: 2026-11-06 07:27 PST | ||
| Date/Time (PST) | Pool Height | Date/Time (PST) | Pool Height |
| 2026-11-07 00:00 | 1287.92 | 2026-11-07 10:00 | 1287.37 |
| 2026-11-06 00:00 | 1288.29 | 2026-11-07 16:00 | 1287.23 |
| 2026-11-05 00:00 | 1288.83 | 2026-11-07 22:00 | 1287.1 |
| 2026-11-04 00:00 | 1289.12 | 2026-11-08 04:00 | 1286.97 |
| 2026-11-03 00:00 | 1288.93 | 2026-11-08 10:00 | 1286.84 |
| 2026-11-02 00:00 | 1288.55 | 2026-11-08 16:00 | 1286.71 |
| 2026-11-01 00:00 | 1288.4 | 2026-11-08 22:00 | 1286.58 |
| 2026-10-30 23:00 | 1288.55 | 2026-11-09 04:00 | 1286.44 |
| 2026-10-29 23:00 | 1288.65 | 2026-11-09 10:00 | 1286.31 |
| 2026-10-28 23:00 | 1288.69 | 2026-11-09 16:00 | 1286.17 |
| 2026-10-27 23:00 | 1288.64 | 2026-11-09 22:00 | 1286.03 |
| 2026-11-10 04:00 | 1285.9 | ||
| 2026-11-10 10:00 | 1285.76 | ||
| 2026-11-10 16:00 | 1285.63 | ||
| 2026-11-10 22:00 | 1285.49 | ||
| 2026-11-11 04:00 | 1285.37 | ||
| 2026-11-11 10:00 | 1285.24 | ||
| 2026-11-11 16:00 | 1285.11 | ||
| 2026-11-11 22:00 | 1284.99 | ||
| 2026-11-12 04:00 | 1284.86 | ||
| 2026-11-12 10:00 | 1284.73 | ||
| 2026-11-12 16:00 | 1284.61 | ||
| 2026-11-12 22:00 | 1284.48 | ||
| 2026-11-13 04:00 | 1284.36 | ||
| 2026-11-13 10:00 | 1284.23 | ||
| 2026-11-13 16:00 | 1284.1 | ||
| 2026-11-13 22:00 | 1283.98 | ||
| 2026-11-14 04:00 | 1283.85 | ||
| 2026-11-14 10:00 | 1283.73 | ||
| 2026-11-14 16:00 | 1283.6 | ||
| 2026-11-14 22:00 | 1283.47 | ||
| 2026-11-15 04:00 | 1283.35 | ||
| 2026-11-15 10:00 | 1283.23 | ||
| 2026-11-15 16:00 | 1283.1 | ||
| 2026-11-15 22:00 | 1282.98 | ||
| 2026-11-16 04:00 | 1282.84 | ||