COLUMBIA--GRAND COULEE DAM (GCDW1)
| Observed | Forecast/Trend Issued: 2026-07-17 09:54 PDT | ||
| Date/Time (PDT) | Inflow | Date/Time (PDT) | Inflow |
| 2026-07-17 00:00 | 89200 | 2026-07-18 05:00 | 98368.29 |
| 2026-07-16 00:00 | 104200 | 2026-07-18 11:00 | 97752.13 |
| 2026-07-15 00:00 | 101900 | 2026-07-18 17:00 | 97401.31 |
| 2026-07-14 00:00 | 104400 | 2026-07-18 23:00 | 97258.45 |
| 2026-07-13 00:00 | 105900 | 2026-07-19 05:00 | 97340.65 |
| 2026-07-12 00:00 | 110900 | 2026-07-19 11:00 | 97616.55 |
| 2026-07-11 00:00 | 123500 | 2026-07-19 17:00 | 97928.97 |
| 2026-07-10 00:00 | 123200 | 2026-07-19 23:00 | 98126.97 |
| 2026-07-09 00:00 | 118700 | 2026-07-20 05:00 | 98172.15 |
| 2026-07-08 00:00 | 132900 | 2026-07-20 11:00 | 98091.41 |
| 2026-07-20 17:00 | 97951.41 | ||
| 2026-07-20 23:00 | 97792.43 | ||
| 2026-07-21 05:00 | 97625.77 | ||
| 2026-07-21 11:00 | 97449.07 | ||
| 2026-07-21 17:00 | 97284.42 | ||
| 2026-07-21 23:00 | 97139.56 | ||
| 2026-07-22 05:00 | 97009.51 | ||
| 2026-07-22 11:00 | 96882.13 | ||
| 2026-07-22 17:00 | 96764.03 | ||
| 2026-07-22 23:00 | 96670.31 | ||
| 2026-07-23 05:00 | 96601.78 | ||
| 2026-07-23 11:00 | 96523.25 | ||
| 2026-07-23 17:00 | 96438.97 | ||
| 2026-07-23 23:00 | 96366.79 | ||
| 2026-07-24 05:00 | 96304.15 | ||
| 2026-07-24 11:00 | 96218.79 | ||
| 2026-07-24 17:00 | 96121.43 | ||
| 2026-07-24 23:00 | 96036.93 | ||
| 2026-07-25 05:00 | 95961.93 | ||
| 2026-07-25 11:00 | 95863.89 | ||
| 2026-07-25 17:00 | 95748.83 | ||
| 2026-07-25 23:00 | 95636.25 | ||
| 2026-07-26 05:00 | 95528.56 | ||
| 2026-07-26 11:00 | 95403.17 | ||
| 2026-07-26 17:00 | 95268.63 | ||
| 2026-07-26 23:00 | 95140.91 | ||
| 2026-07-27 05:00 | 95019.15 | ||