COLUMBIA--GRAND COULEE DAM (GCDW1)
| Observed | Forecast/Trend Issued: 2026-08-14 08:27 PDT | ||
| Date/Time (PDT) | Inflow | Date/Time (PDT) | Inflow |
| 2026-08-15 00:00 | 83200 | 2026-08-15 11:00 | 82198.09 |
| 2026-08-14 00:00 | 85400 | 2026-08-15 17:00 | 80131.21 |
| 2026-08-13 00:00 | 87700 | 2026-08-15 23:00 | 78691.49 |
| 2026-08-12 00:00 | 82100 | 2026-08-16 05:00 | 78200.59 |
| 2026-08-11 00:00 | 89200 | 2026-08-16 11:00 | 78131.54 |
| 2026-08-10 00:00 | 86300 | 2026-08-16 17:00 | 78152.19 |
| 2026-08-09 00:00 | 86200 | 2026-08-16 23:00 | 78201.1 |
| 2026-08-08 00:00 | 86500 | 2026-08-17 05:00 | 78263.78 |
| 2026-08-07 00:00 | 86900 | 2026-08-17 11:00 | 78365.81 |
| 2026-08-06 00:00 | 90800 | 2026-08-17 17:00 | 78570.06 |
| 2026-08-05 00:00 | 85600 | 2026-08-17 23:00 | 78932.47 |
| 2026-08-18 05:00 | 79425.91 | ||
| 2026-08-18 11:00 | 79949 | ||
| 2026-08-18 17:00 | 80394.13 | ||
| 2026-08-18 23:00 | 80711.97 | ||
| 2026-08-19 05:00 | 80904.56 | ||
| 2026-08-19 11:00 | 81006.42 | ||
| 2026-08-19 17:00 | 81052.97 | ||
| 2026-08-19 23:00 | 81069.03 | ||
| 2026-08-20 05:00 | 80989.99 | ||
| 2026-08-20 11:00 | 80680.97 | ||
| 2026-08-20 17:00 | 80212.52 | ||
| 2026-08-20 23:00 | 79868.98 | ||
| 2026-08-21 05:00 | 79736.8 | ||
| 2026-08-21 11:00 | 79701.79 | ||
| 2026-08-21 17:00 | 79691.05 | ||
| 2026-08-21 23:00 | 79697.05 | ||
| 2026-08-22 05:00 | 79716.45 | ||
| 2026-08-22 11:00 | 79749.13 | ||
| 2026-08-22 17:00 | 79786.84 | ||
| 2026-08-22 23:00 | 79816.16 | ||
| 2026-08-23 05:00 | 79831.82 | ||
| 2026-08-23 11:00 | 79843.7 | ||
| 2026-08-23 17:00 | 79853.5 | ||
| 2026-08-23 23:00 | 79858.08 | ||
| 2026-08-24 05:00 | 79854.17 | ||