COLUMBIA--GRAND COULEE DAM (GCDW1)
| Observed | Forecast/Trend Issued: 2026-04-06 09:54 PDT | ||
| Date/Time (PDT) | Inflow | Date/Time (PDT) | Inflow |
| 2026-04-07 00:00 | 113600 | 2026-04-07 05:00 | 112006.18 |
| 2026-04-06 00:00 | 108600 | 2026-04-07 11:00 | 112305.7 |
| 2026-04-05 00:00 | 119200 | 2026-04-07 17:00 | 112619.03 |
| 2026-04-04 00:00 | 118500 | 2026-04-07 23:00 | 112869.5 |
| 2026-04-03 00:00 | 119200 | 2026-04-08 05:00 | 113031.59 |
| 2026-04-02 00:00 | 117500 | 2026-04-08 11:00 | 113112.34 |
| 2026-04-01 00:00 | 121300 | 2026-04-08 17:00 | 113107.5 |
| 2026-03-31 00:00 | 119400 | 2026-04-08 23:00 | 113039.38 |
| 2026-03-30 00:00 | 127000 | 2026-04-09 05:00 | 112926.63 |
| 2026-03-29 00:00 | 136900 | 2026-04-09 11:00 | 112826.15 |
| 2026-03-28 00:00 | 136900 | 2026-04-09 17:00 | 112777.76 |
| 2026-04-09 23:00 | 112772.06 | ||
| 2026-04-10 05:00 | 112793.08 | ||
| 2026-04-10 11:00 | 112914.78 | ||
| 2026-04-10 17:00 | 113173.57 | ||
| 2026-04-10 23:00 | 113490.68 | ||
| 2026-04-11 05:00 | 113863.33 | ||
| 2026-04-11 11:00 | 114299.29 | ||
| 2026-04-11 17:00 | 114758.18 | ||
| 2026-04-11 23:00 | 115241.68 | ||
| 2026-04-12 05:00 | 115768.65 | ||
| 2026-04-12 11:00 | 116367.41 | ||
| 2026-04-12 17:00 | 117046.17 | ||
| 2026-04-12 23:00 | 117816.49 | ||
| 2026-04-13 05:00 | 118599.23 | ||
| 2026-04-13 11:00 | 119338.49 | ||
| 2026-04-13 17:00 | 120005.72 | ||
| 2026-04-13 23:00 | 120606.61 | ||
| 2026-04-14 05:00 | 121126.53 | ||
| 2026-04-14 11:00 | 121588.33 | ||
| 2026-04-14 17:00 | 122004.37 | ||
| 2026-04-14 23:00 | 122377.07 | ||
| 2026-04-15 05:00 | 122710.74 | ||
| 2026-04-15 11:00 | 123020.23 | ||
| 2026-04-15 17:00 | 123302.71 | ||
| 2026-04-15 23:00 | 123560.55 | ||
| 2026-04-16 05:00 | 123822.92 | ||