COLUMBIA--GRAND COULEE DAM (GCDW1)
| Observed | Forecast/Trend Issued: 2026-09-12 08:49 PDT | ||
| Date/Time (PDT) | Inflow | Date/Time (PDT) | Inflow |
| 2026-09-12 00:00 | 69700 | 2026-09-12 17:00 | 71433.5 |
| 2026-09-11 00:00 | 68000 | 2026-09-12 23:00 | 70410.19 |
| 2026-09-10 00:00 | 65000 | 2026-09-13 05:00 | 69389.89 |
| 2026-09-09 00:00 | 63300 | 2026-09-13 11:00 | 68826.03 |
| 2026-09-08 00:00 | 65700 | 2026-09-13 17:00 | 68517.89 |
| 2026-09-07 00:00 | 61900 | 2026-09-13 23:00 | 68290.23 |
| 2026-09-06 00:00 | 73600 | 2026-09-14 05:00 | 68124.78 |
| 2026-09-05 00:00 | 74200 | 2026-09-14 11:00 | 68054.35 |
| 2026-09-04 00:00 | 73400 | 2026-09-14 17:00 | 68081.45 |
| 2026-09-03 00:00 | 73600 | 2026-09-14 23:00 | 68152.58 |
| 2026-09-02 00:00 | 72400 | 2026-09-15 05:00 | 68182.54 |
| 2026-09-15 11:00 | 68123.89 | ||
| 2026-09-15 17:00 | 67968.57 | ||
| 2026-09-15 23:00 | 67741.59 | ||
| 2026-09-16 05:00 | 67479.16 | ||
| 2026-09-16 11:00 | 67228.8 | ||
| 2026-09-16 17:00 | 67019.08 | ||
| 2026-09-16 23:00 | 66861.12 | ||
| 2026-09-17 05:00 | 66755.9 | ||
| 2026-09-17 11:00 | 66700.3 | ||
| 2026-09-17 17:00 | 66687.49 | ||
| 2026-09-17 23:00 | 66708.28 | ||
| 2026-09-18 05:00 | 66751.51 | ||
| 2026-09-18 11:00 | 66806.07 | ||
| 2026-09-18 17:00 | 66859.1 | ||
| 2026-09-18 23:00 | 66898.44 | ||
| 2026-09-19 05:00 | 66817.76 | ||
| 2026-09-19 11:00 | 66393.18 | ||
| 2026-09-19 17:00 | 65683.55 | ||
| 2026-09-19 23:00 | 65108.78 | ||
| 2026-09-20 05:00 | 64853.75 | ||
| 2026-09-20 11:00 | 64762.93 | ||
| 2026-09-20 17:00 | 64707.08 | ||
| 2026-09-20 23:00 | 64652.7 | ||
| 2026-09-21 05:00 | 64597.57 | ||
| 2026-09-21 11:00 | 64570.5 | ||
| 2026-09-21 17:00 | 64700.21 | ||
| 2026-09-21 23:00 | 65232.27 | ||
| 2026-09-22 05:00 | 66351.21 | ||