COLUMBIA--GRAND COULEE DAM (GCDW1)
| Observed | Forecast/Trend Issued: 2026-02-10 09:28 PST | ||
| Date/Time (PST) | Pool Height | Date/Time (PST) | Pool Height |
| 2026-02-11 00:00 | 1274.62 | 2026-02-11 10:00 | 1274.16 |
| 2026-02-10 00:00 | 1275.35 | 2026-02-11 16:00 | 1274 |
| 2026-02-09 00:00 | 1275.86 | 2026-02-11 22:00 | 1273.84 |
| 2026-02-08 00:00 | 1275.98 | 2026-02-12 04:00 | 1273.68 |
| 2026-02-07 00:00 | 1276.14 | 2026-02-12 10:00 | 1273.52 |
| 2026-02-06 00:00 | 1276.63 | 2026-02-12 16:00 | 1273.35 |
| 2026-02-05 00:00 | 1276.7 | 2026-02-12 22:00 | 1273.19 |
| 2026-02-04 00:00 | 1276.9 | 2026-02-13 04:00 | 1273.02 |
| 2026-02-03 00:00 | 1277.51 | 2026-02-13 10:00 | 1272.86 |
| 2026-02-02 00:00 | 1277.65 | 2026-02-13 16:00 | 1272.69 |
| 2026-02-01 00:00 | 1277.71 | 2026-02-13 22:00 | 1272.53 |
| 2026-02-14 04:00 | 1272.36 | ||
| 2026-02-14 10:00 | 1272.2 | ||
| 2026-02-14 16:00 | 1272.04 | ||
| 2026-02-14 22:00 | 1271.87 | ||
| 2026-02-15 04:00 | 1271.71 | ||
| 2026-02-15 10:00 | 1271.54 | ||
| 2026-02-15 16:00 | 1271.38 | ||
| 2026-02-15 22:00 | 1271.22 | ||
| 2026-02-16 04:00 | 1271.07 | ||
| 2026-02-16 10:00 | 1270.93 | ||
| 2026-02-16 16:00 | 1270.8 | ||
| 2026-02-16 22:00 | 1270.68 | ||
| 2026-02-17 04:00 | 1270.57 | ||
| 2026-02-17 10:00 | 1270.47 | ||
| 2026-02-17 16:00 | 1270.36 | ||
| 2026-02-17 22:00 | 1270.26 | ||
| 2026-02-18 04:00 | 1270.15 | ||
| 2026-02-18 10:00 | 1270.05 | ||
| 2026-02-18 16:00 | 1269.94 | ||
| 2026-02-18 22:00 | 1269.83 | ||
| 2026-02-19 04:00 | 1269.73 | ||
| 2026-02-19 10:00 | 1269.62 | ||
| 2026-02-19 16:00 | 1269.51 | ||
| 2026-02-19 22:00 | 1269.4 | ||
| 2026-02-20 04:00 | 1269.3 | ||