COLUMBIA--GRAND COULEE DAM (GCDW1)
| Observed | Forecast/Trend Issued: 2026-09-05 08:55 PDT | ||
| Date/Time (PDT) | Inflow | Date/Time (PDT) | Inflow |
| 2026-09-05 00:00 | 74200 | 2026-09-05 23:00 | 71888.19 |
| 2026-09-04 00:00 | 73400 | 2026-09-06 05:00 | 70210.87 |
| 2026-09-03 00:00 | 73600 | 2026-09-06 11:00 | 69734.93 |
| 2026-09-02 00:00 | 72400 | 2026-09-06 17:00 | 69832.89 |
| 2026-09-01 00:00 | 76500 | 2026-09-06 23:00 | 70007.57 |
| 2026-08-31 00:00 | 69600 | 2026-09-07 05:00 | 70120.65 |
| 2026-08-30 00:00 | 75900 | 2026-09-07 11:00 | 70161.02 |
| 2026-08-29 00:00 | 80400 | 2026-09-07 17:00 | 70107.42 |
| 2026-08-28 00:00 | 77300 | 2026-09-07 23:00 | 69894.88 |
| 2026-08-27 00:00 | 77500 | 2026-09-08 05:00 | 69560.34 |
| 2026-08-26 00:00 | 80400 | 2026-09-08 11:00 | 69286.38 |
| 2026-09-08 17:00 | 69163.65 | ||
| 2026-09-08 23:00 | 69146.88 | ||
| 2026-09-09 05:00 | 69166 | ||
| 2026-09-09 11:00 | 69169.99 | ||
| 2026-09-09 17:00 | 69116.26 | ||
| 2026-09-09 23:00 | 68989.07 | ||
| 2026-09-10 05:00 | 68800.94 | ||
| 2026-09-10 11:00 | 68586.72 | ||
| 2026-09-10 17:00 | 68372.49 | ||
| 2026-09-10 23:00 | 68167.88 | ||
| 2026-09-11 05:00 | 67970.31 | ||
| 2026-09-11 11:00 | 67781.2 | ||
| 2026-09-11 17:00 | 67599.47 | ||
| 2026-09-11 23:00 | 67427.45 | ||
| 2026-09-12 05:00 | 67267.42 | ||
| 2026-09-12 11:00 | 67129.21 | ||
| 2026-09-12 17:00 | 67017.24 | ||
| 2026-09-12 23:00 | 66931.71 | ||
| 2026-09-13 05:00 | 66860.6 | ||
| 2026-09-13 11:00 | 66796.75 | ||
| 2026-09-13 17:00 | 66728.17 | ||
| 2026-09-13 23:00 | 66642.41 | ||
| 2026-09-14 05:00 | 66529.67 | ||
| 2026-09-14 11:00 | 66399.36 | ||
| 2026-09-14 17:00 | 66263.7 | ||
| 2026-09-14 23:00 | 66133.05 | ||
| 2026-09-15 05:00 | 66016.21 | ||