COLUMBIA--GRAND COULEE DAM (GCDW1)
| Observed | Forecast/Trend Issued: 2026-04-03 08:23 PDT | ||
| Date/Time (PDT) | Inflow | Date/Time (PDT) | Inflow |
| 2026-04-03 00:00 | 119200 | 2026-04-03 23:00 | 120480.69 |
| 2026-04-02 00:00 | 117500 | 2026-04-04 05:00 | 120005.21 |
| 2026-04-01 00:00 | 121300 | 2026-04-04 11:00 | 119555.69 |
| 2026-03-31 00:00 | 119400 | 2026-04-04 17:00 | 119133.25 |
| 2026-03-30 00:00 | 127000 | 2026-04-04 23:00 | 118749.64 |
| 2026-03-29 00:00 | 136900 | 2026-04-05 05:00 | 118409.23 |
| 2026-03-28 00:00 | 136900 | 2026-04-05 11:00 | 118181.85 |
| 2026-03-27 00:00 | 145800 | 2026-04-05 17:00 | 118084.96 |
| 2026-03-26 00:00 | 119300 | 2026-04-05 23:00 | 118100.24 |
| 2026-03-25 00:00 | 124300 | 2026-04-06 05:00 | 118199.42 |
| 2026-03-24 00:00 | 131800 | 2026-04-06 11:00 | 118393.04 |
| 2026-04-06 17:00 | 118650.63 | ||
| 2026-04-06 23:00 | 118965.96 | ||
| 2026-04-07 05:00 | 119331.17 | ||
| 2026-04-07 11:00 | 119746.02 | ||
| 2026-04-07 17:00 | 120138.64 | ||
| 2026-04-07 23:00 | 120458.53 | ||
| 2026-04-08 05:00 | 120690.96 | ||
| 2026-04-08 11:00 | 120831.76 | ||
| 2026-04-08 17:00 | 120882.47 | ||
| 2026-04-08 23:00 | 120864.78 | ||
| 2026-04-09 05:00 | 120799.09 | ||
| 2026-04-09 11:00 | 120687.32 | ||
| 2026-04-09 17:00 | 120551.77 | ||
| 2026-04-09 23:00 | 120402.01 | ||
| 2026-04-10 05:00 | 120237.12 | ||
| 2026-04-10 11:00 | 120055.92 | ||
| 2026-04-10 17:00 | 119872.28 | ||
| 2026-04-10 23:00 | 119674.12 | ||
| 2026-04-11 05:00 | 119472.15 | ||
| 2026-04-11 11:00 | 119264.69 | ||
| 2026-04-11 17:00 | 119068.68 | ||
| 2026-04-11 23:00 | 118868.78 | ||
| 2026-04-12 05:00 | 118686.28 | ||
| 2026-04-12 11:00 | 118557.87 | ||
| 2026-04-12 17:00 | 118452.9 | ||
| 2026-04-12 23:00 | 118378.78 | ||
| 2026-04-13 05:00 | 118357.35 | ||