COLUMBIA--GRAND COULEE DAM (GCDW1)
| Observed | Forecast/Trend Issued: 2026-07-05 08:43 PDT | ||
| Date/Time (PDT) | Pool Height | Date/Time (PDT) | Pool Height |
| 2026-07-05 00:00 | 1286.51 | 2026-07-05 17:00 | 1287.13 |
| 2026-07-04 00:00 | 1286.25 | 2026-07-05 23:00 | 1287.25 |
| 2026-07-03 00:00 | 1285.87 | 2026-07-06 05:00 | 1287.38 |
| 2026-07-02 00:00 | 1285.6 | 2026-07-06 11:00 | 1287.5 |
| 2026-07-01 00:00 | 1285.76 | 2026-07-06 17:00 | 1287.63 |
| 2026-06-30 00:00 | 1285.92 | 2026-07-06 23:00 | 1287.75 |
| 2026-06-29 00:00 | 1285.92 | 2026-07-07 05:00 | 1287.88 |
| 2026-06-28 00:00 | 1285.37 | 2026-07-07 11:00 | 1288 |
| 2026-06-27 00:00 | 1285 | 2026-07-07 17:00 | 1288.13 |
| 2026-06-26 00:00 | 1285.19 | 2026-07-07 23:00 | 1288.25 |
| 2026-06-25 00:00 | 1285.39 | 2026-07-08 05:00 | 1288.37 |
| 2026-07-08 11:00 | 1288.5 | ||
| 2026-07-08 17:00 | 1288.62 | ||
| 2026-07-08 23:00 | 1288.75 | ||
| 2026-07-09 05:00 | 1288.87 | ||
| 2026-07-09 11:00 | 1289 | ||
| 2026-07-09 17:00 | 1289.02 | ||
| 2026-07-09 23:00 | 1289.03 | ||
| 2026-07-10 05:00 | 1289.05 | ||
| 2026-07-10 11:00 | 1289.07 | ||
| 2026-07-10 17:00 | 1289.09 | ||
| 2026-07-10 23:00 | 1289.1 | ||
| 2026-07-11 05:00 | 1289.12 | ||
| 2026-07-11 11:00 | 1289.14 | ||
| 2026-07-11 17:00 | 1289.16 | ||
| 2026-07-11 23:00 | 1289.17 | ||
| 2026-07-12 05:00 | 1289.19 | ||
| 2026-07-12 11:00 | 1289.21 | ||
| 2026-07-12 17:00 | 1289.23 | ||
| 2026-07-12 23:00 | 1289.24 | ||
| 2026-07-13 05:00 | 1289.26 | ||
| 2026-07-13 11:00 | 1289.28 | ||
| 2026-07-13 17:00 | 1289.3 | ||
| 2026-07-13 23:00 | 1289.31 | ||
| 2026-07-14 05:00 | 1289.33 | ||
| 2026-07-14 11:00 | 1289.35 | ||
| 2026-07-14 17:00 | 1289.36 | ||
| 2026-07-14 23:00 | 1289.38 | ||
| 2026-07-15 05:00 | 1289.4 | ||