COLUMBIA--GRAND COULEE DAM (GCDW1)
| Observed | Forecast/Trend Issued: 2026-11-10 07:41 PST | ||
| Date/Time (PST) | Pool Height | Date/Time (PST) | Pool Height |
| 2026-11-10 00:00 | 1287.15 | 2026-11-10 10:00 | 1286.56 |
| 2026-11-09 00:00 | 1287.51 | 2026-11-10 16:00 | 1286.44 |
| 2026-11-08 00:00 | 1287.71 | 2026-11-10 22:00 | 1286.32 |
| 2026-11-07 00:00 | 1287.92 | 2026-11-11 04:00 | 1286.18 |
| 2026-11-06 00:00 | 1288.29 | 2026-11-11 10:00 | 1286.04 |
| 2026-11-05 00:00 | 1288.83 | 2026-11-11 16:00 | 1285.88 |
| 2026-11-04 00:00 | 1289.12 | 2026-11-11 22:00 | 1285.72 |
| 2026-11-03 00:00 | 1288.93 | 2026-11-12 04:00 | 1285.56 |
| 2026-11-02 00:00 | 1288.55 | 2026-11-12 10:00 | 1285.39 |
| 2026-11-01 00:00 | 1288.4 | 2026-11-12 16:00 | 1285.21 |
| 2026-10-30 23:00 | 1288.55 | 2026-11-12 22:00 | 1285.03 |
| 2026-11-13 04:00 | 1284.85 | ||
| 2026-11-13 10:00 | 1284.66 | ||
| 2026-11-13 16:00 | 1284.47 | ||
| 2026-11-13 22:00 | 1284.29 | ||
| 2026-11-14 04:00 | 1284.1 | ||
| 2026-11-14 10:00 | 1283.91 | ||
| 2026-11-14 16:00 | 1283.72 | ||
| 2026-11-14 22:00 | 1283.53 | ||
| 2026-11-15 04:00 | 1283.34 | ||
| 2026-11-15 10:00 | 1283.15 | ||
| 2026-11-15 16:00 | 1282.96 | ||
| 2026-11-15 22:00 | 1282.77 | ||
| 2026-11-16 04:00 | 1282.58 | ||
| 2026-11-16 10:00 | 1282.4 | ||
| 2026-11-16 16:00 | 1282.23 | ||
| 2026-11-16 22:00 | 1282.07 | ||
| 2026-11-17 04:00 | 1281.91 | ||
| 2026-11-17 10:00 | 1281.76 | ||
| 2026-11-17 16:00 | 1281.61 | ||
| 2026-11-17 22:00 | 1281.46 | ||
| 2026-11-18 04:00 | 1281.31 | ||
| 2026-11-18 10:00 | 1281.16 | ||
| 2026-11-18 16:00 | 1281 | ||
| 2026-11-18 22:00 | 1280.85 | ||
| 2026-11-19 04:00 | 1280.69 | ||
| 2026-11-19 10:00 | 1280.54 | ||
| 2026-11-19 16:00 | 1280.38 | ||
| 2026-11-19 22:00 | 1280.22 | ||
| 2026-11-20 04:00 | 1280.06 | ||