COLUMBIA--GRAND COULEE DAM (GCDW1)
| Observed | Forecast/Trend |
| Date/Time (PST) | Pool Height | Date/Time (PST) | Pool Height |
| 2022-11-30 23:59 | 1279.3 | 2022-12-01 16:00 | 1278.9 |
| 2022-11-29 23:59 | 1279.25 | 2022-12-01 22:00 | 1278.88 |
| 2022-11-28 23:59 | 1279.59 | 2022-12-02 04:00 | 1278.88 |
| 2022-11-27 23:59 | 1279.84 | 2022-12-02 10:00 | 1278.91 |
| 2022-11-26 23:59 | 1280.11 | 2022-12-02 16:00 | 1278.95 |
| 2022-11-25 23:59 | 1280.31 | 2022-12-02 22:00 | 1279 |
| 2022-11-24 23:59 | 1280.49 | 2022-12-03 04:00 | 1279.05 |
| 2022-11-23 23:59 | 1280.97 | 2022-12-03 10:00 | 1279.07 |
| 2022-11-22 23:59 | 1281.17 | 2022-12-03 16:00 | 1279.05 |
| 2022-11-21 23:59 | 1281.32 | 2022-12-03 22:00 | 1278.99 |
| 2022-11-20 23:59 | 1281.46 | 2022-12-04 04:00 | 1278.92 |
| | | 2022-12-04 10:00 | 1278.83 |
| | | 2022-12-04 16:00 | 1278.75 |
| | | 2022-12-04 22:00 | 1278.66 |
| | | 2022-12-05 04:00 | 1278.57 |
| | | 2022-12-05 10:00 | 1278.47 |
| | | 2022-12-05 16:00 | 1278.37 |
| | | 2022-12-05 22:00 | 1278.27 |
| | | 2022-12-06 04:00 | 1278.17 |
| | | 2022-12-06 10:00 | 1278.07 |
| | | 2022-12-06 16:00 | 1277.97 |
| | | 2022-12-06 22:00 | 1277.87 |
| | | 2022-12-07 04:00 | 1277.77 |
| | | 2022-12-07 10:00 | 1277.68 |
| | | 2022-12-07 16:00 | 1277.58 |
| | | 2022-12-07 22:00 | 1277.48 |
| | | 2022-12-08 04:00 | 1277.39 |
| | | 2022-12-08 10:00 | 1277.29 |
| | | 2022-12-08 16:00 | 1277.2 |
| | | 2022-12-08 22:00 | 1277.1 |
| | | 2022-12-09 04:00 | 1277 |
| | | 2022-12-09 10:00 | 1276.91 |
| | | 2022-12-09 16:00 | 1276.81 |
| | | 2022-12-09 22:00 | 1276.71 |
| | | 2022-12-10 04:00 | 1276.61 |
| | | 2022-12-10 10:00 | 1276.51 |
| | | 2022-12-10 16:00 | 1276.41 |
| | | 2022-12-10 22:00 | 1276.31 |
| | | 2022-12-11 04:00 | 1276.21 |