COLUMBIA--GRAND COULEE DAM (GCDW1)
| Observed | Forecast/Trend Issued: 2026-07-24 09:11 PDT | ||
| Date/Time (PDT) | Inflow | Date/Time (PDT) | Inflow |
| 2026-07-25 00:00 | 92000 | 2026-07-25 05:00 | 93128.55 |
| 2026-07-24 00:00 | 95400 | 2026-07-25 11:00 | 92987.98 |
| 2026-07-23 00:00 | 98000 | 2026-07-25 17:00 | 93282.85 |
| 2026-07-22 00:00 | 92900 | 2026-07-25 23:00 | 93423.61 |
| 2026-07-21 00:00 | 95200 | 2026-07-26 05:00 | 93248.79 |
| 2026-07-20 00:00 | 93300 | 2026-07-26 11:00 | 93030.09 |
| 2026-07-19 00:00 | 87700 | 2026-07-26 17:00 | 92902.79 |
| 2026-07-18 00:00 | 97400 | 2026-07-26 23:00 | 92849.11 |
| 2026-07-17 00:00 | 89200 | 2026-07-27 05:00 | 92853.17 |
| 2026-07-16 00:00 | 104200 | 2026-07-27 11:00 | 92917.53 |
| 2026-07-15 00:00 | 101900 | 2026-07-27 17:00 | 93061.31 |
| 2026-07-27 23:00 | 93259.94 | ||
| 2026-07-28 05:00 | 93459.77 | ||
| 2026-07-28 11:00 | 93613.3 | ||
| 2026-07-28 17:00 | 93722.31 | ||
| 2026-07-28 23:00 | 93798.92 | ||
| 2026-07-29 05:00 | 93853.84 | ||
| 2026-07-29 11:00 | 93885.21 | ||
| 2026-07-29 17:00 | 93903.44 | ||
| 2026-07-29 23:00 | 93906.23 | ||
| 2026-07-30 05:00 | 93887.86 | ||
| 2026-07-30 11:00 | 93852.99 | ||
| 2026-07-30 17:00 | 93850.87 | ||
| 2026-07-30 23:00 | 93911.54 | ||
| 2026-07-31 05:00 | 94021.22 | ||
| 2026-07-31 11:00 | 94146.57 | ||
| 2026-07-31 17:00 | 94283.07 | ||
| 2026-07-31 23:00 | 94425.95 | ||
| 2026-08-01 05:00 | 94702.32 | ||
| 2026-08-01 11:00 | 95411.1 | ||
| 2026-08-01 17:00 | 96479.15 | ||
| 2026-08-01 23:00 | 97202.29 | ||
| 2026-08-02 05:00 | 97414.48 | ||
| 2026-08-02 11:00 | 97436.23 | ||
| 2026-08-02 17:00 | 97414.77 | ||
| 2026-08-02 23:00 | 97358.12 | ||
| 2026-08-03 05:00 | 97270.48 | ||