COLUMBIA--GRAND COULEE DAM (GCDW1)
| Observed | Forecast/Trend Issued: 2026-07-10 08:18 PDT | ||
| Date/Time (PDT) | Inflow | Date/Time (PDT) | Inflow |
| 2026-07-10 00:00 | 123200 | 2026-07-10 23:00 | 117607.25 |
| 2026-07-09 00:00 | 118700 | 2026-07-11 05:00 | 116024.41 |
| 2026-07-08 00:00 | 132900 | 2026-07-11 11:00 | 113552.27 |
| 2026-07-07 00:00 | 137600 | 2026-07-11 17:00 | 111062.42 |
| 2026-07-06 00:00 | 144300 | 2026-07-11 23:00 | 109527.49 |
| 2026-07-05 00:00 | 145100 | 2026-07-12 05:00 | 108798.32 |
| 2026-07-04 00:00 | 148900 | 2026-07-12 11:00 | 108382.97 |
| 2026-07-03 00:00 | 153100 | 2026-07-12 17:00 | 108070.35 |
| 2026-07-02 00:00 | 144600 | 2026-07-12 23:00 | 107781.79 |
| 2026-07-01 00:00 | 133900 | 2026-07-13 05:00 | 107464.13 |
| 2026-06-30 00:00 | 131300 | 2026-07-13 11:00 | 107092.73 |
| 2026-07-13 17:00 | 106677.96 | ||
| 2026-07-13 23:00 | 106242.43 | ||
| 2026-07-14 05:00 | 105786.9 | ||
| 2026-07-14 11:00 | 105300.56 | ||
| 2026-07-14 17:00 | 104793.07 | ||
| 2026-07-14 23:00 | 104305.43 | ||
| 2026-07-15 05:00 | 103872.47 | ||
| 2026-07-15 11:00 | 103507.97 | ||
| 2026-07-15 17:00 | 103210.07 | ||
| 2026-07-15 23:00 | 102967.47 | ||
| 2026-07-16 05:00 | 102758.99 | ||
| 2026-07-16 11:00 | 102567.09 | ||
| 2026-07-16 17:00 | 102383.75 | ||
| 2026-07-16 23:00 | 102201.62 | ||
| 2026-07-17 05:00 | 102017.01 | ||
| 2026-07-17 11:00 | 101811.84 | ||
| 2026-07-17 17:00 | 101602.67 | ||
| 2026-07-17 23:00 | 101402.43 | ||
| 2026-07-18 05:00 | 101211.43 | ||
| 2026-07-18 11:00 | 101014.47 | ||
| 2026-07-18 17:00 | 100820.29 | ||
| 2026-07-18 23:00 | 100636.36 | ||
| 2026-07-19 05:00 | 100467.85 | ||
| 2026-07-19 11:00 | 100312.09 | ||
| 2026-07-19 17:00 | 100144.66 | ||
| 2026-07-19 23:00 | 99915.95 | ||
| 2026-07-20 05:00 | 99649.95 | ||