COLUMBIA--GRAND COULEE DAM (GCDW1)
| Observed | Forecast/Trend Issued: 2026-03-19 10:16 PDT | ||
| Date/Time (PDT) | Inflow | Date/Time (PDT) | Inflow |
| 2026-03-20 00:00 | 97700 | 2026-03-20 11:00 | 107447.75 |
| 2026-03-19 00:00 | 103400 | 2026-03-20 17:00 | 108342.74 |
| 2026-03-18 00:00 | 103400 | 2026-03-20 23:00 | 109313.41 |
| 2026-03-17 00:00 | 102300 | 2026-03-21 05:00 | 110449.06 |
| 2026-03-16 00:00 | 101800 | 2026-03-21 11:00 | 111603.07 |
| 2026-03-15 00:00 | 97500 | 2026-03-21 17:00 | 112648.99 |
| 2026-03-14 00:00 | 105500 | 2026-03-21 23:00 | 113496.6 |
| 2026-03-13 00:00 | 104300 | 2026-03-22 05:00 | 114122.11 |
| 2026-03-12 00:00 | 90200 | 2026-03-22 11:00 | 114607.47 |
| 2026-03-11 00:00 | 92000 | 2026-03-22 17:00 | 115055.61 |
| 2026-03-10 00:00 | 99800 | 2026-03-22 23:00 | 115531.68 |
| 2026-03-23 05:00 | 116041.59 | ||
| 2026-03-23 11:00 | 116585.88 | ||
| 2026-03-23 17:00 | 117158.17 | ||
| 2026-03-23 23:00 | 117741.49 | ||
| 2026-03-24 05:00 | 118299.5 | ||
| 2026-03-24 11:00 | 118822.63 | ||
| 2026-03-24 17:00 | 119306.84 | ||
| 2026-03-24 23:00 | 119768.23 | ||
| 2026-03-25 05:00 | 120261.79 | ||
| 2026-03-25 11:00 | 120712.23 | ||
| 2026-03-25 17:00 | 121144.59 | ||
| 2026-03-25 23:00 | 121794.98 | ||
| 2026-03-26 05:00 | 122038.11 | ||
| 2026-03-26 11:00 | 122276.12 | ||
| 2026-03-26 17:00 | 122539.45 | ||
| 2026-03-26 23:00 | 122888.21 | ||
| 2026-03-27 05:00 | 123353.35 | ||
| 2026-03-27 11:00 | 123943.08 | ||
| 2026-03-27 17:00 | 124620.48 | ||
| 2026-03-27 23:00 | 125340.1 | ||
| 2026-03-28 05:00 | 125975.04 | ||
| 2026-03-28 11:00 | 126284.76 | ||
| 2026-03-28 17:00 | 126126.44 | ||
| 2026-03-28 23:00 | 125602.78 | ||
| 2026-03-29 05:00 | 124822.49 | ||