COLUMBIA--GRAND COULEE DAM (GCDW1)
| Observed | Forecast/Trend Issued: 2026-06-17 08:49 PDT | ||
| Date/Time (PDT) | Pool Height | Date/Time (PDT) | Pool Height |
| 2026-06-17 00:00 | 1281.32 | 2026-06-17 17:00 | 1282.16 |
| 2026-06-16 00:00 | 1281.16 | 2026-06-17 23:00 | 1282.28 |
| 2026-06-15 00:00 | 1281.43 | 2026-06-18 05:00 | 1282.39 |
| 2026-06-14 00:00 | 1281.55 | 2026-06-18 11:00 | 1282.51 |
| 2026-06-13 00:00 | 1281.58 | 2026-06-18 17:00 | 1282.62 |
| 2026-06-12 00:00 | 1281.06 | 2026-06-18 23:00 | 1282.73 |
| 2026-06-11 00:00 | 1280.08 | 2026-06-19 05:00 | 1282.83 |
| 2026-06-10 00:00 | 1278.74 | 2026-06-19 11:00 | 1282.93 |
| 2026-06-09 00:00 | 1277.83 | 2026-06-19 17:00 | 1283.03 |
| 2026-06-08 00:00 | 1277.18 | 2026-06-19 23:00 | 1283.13 |
| 2026-06-07 00:00 | 1276.41 | 2026-06-20 05:00 | 1283.23 |
| 2026-06-20 11:00 | 1283.34 | ||
| 2026-06-20 17:00 | 1283.45 | ||
| 2026-06-20 23:00 | 1283.58 | ||
| 2026-06-21 05:00 | 1283.7 | ||
| 2026-06-21 11:00 | 1283.82 | ||
| 2026-06-21 17:00 | 1283.87 | ||
| 2026-06-21 23:00 | 1283.92 | ||
| 2026-06-22 05:00 | 1283.97 | ||
| 2026-06-22 11:00 | 1284.03 | ||
| 2026-06-22 17:00 | 1284.08 | ||
| 2026-06-22 23:00 | 1284.13 | ||
| 2026-06-23 05:00 | 1284.18 | ||
| 2026-06-23 11:00 | 1284.23 | ||
| 2026-06-23 17:00 | 1284.28 | ||
| 2026-06-23 23:00 | 1284.33 | ||
| 2026-06-24 05:00 | 1284.38 | ||
| 2026-06-24 11:00 | 1284.43 | ||
| 2026-06-24 17:00 | 1284.48 | ||
| 2026-06-24 23:00 | 1284.53 | ||
| 2026-06-25 05:00 | 1284.58 | ||
| 2026-06-25 11:00 | 1284.63 | ||
| 2026-06-25 17:00 | 1284.68 | ||
| 2026-06-25 23:00 | 1284.73 | ||
| 2026-06-26 05:00 | 1284.79 | ||
| 2026-06-26 11:00 | 1284.84 | ||
| 2026-06-26 17:00 | 1284.89 | ||
| 2026-06-26 23:00 | 1284.94 | ||
| 2026-06-27 05:00 | 1284.99 | ||