COLUMBIA--GRAND COULEE DAM (GCDW1)
| Observed | Forecast/Trend Issued: 2026-04-08 09:11 PDT | ||
| Date/Time (PDT) | Inflow | Date/Time (PDT) | Inflow |
| 2026-04-08 00:00 | 112200 | 2026-04-09 05:00 | 114555.54 |
| 2026-04-07 00:00 | 113600 | 2026-04-09 11:00 | 114512.79 |
| 2026-04-06 00:00 | 114800 | 2026-04-09 17:00 | 114452.79 |
| 2026-04-05 00:00 | 119200 | 2026-04-09 23:00 | 114363.39 |
| 2026-04-04 00:00 | 118500 | 2026-04-10 05:00 | 114272.45 |
| 2026-04-03 00:00 | 119200 | 2026-04-10 11:00 | 114267.09 |
| 2026-04-02 00:00 | 117500 | 2026-04-10 17:00 | 114400.72 |
| 2026-04-01 00:00 | 121300 | 2026-04-10 23:00 | 114584.37 |
| 2026-03-31 00:00 | 119400 | 2026-04-11 05:00 | 114808.87 |
| 2026-03-30 00:00 | 127000 | 2026-04-11 11:00 | 115120.73 |
| 2026-03-29 00:00 | 136900 | 2026-04-11 17:00 | 115534.63 |
| 2026-04-11 23:00 | 116083.05 | ||
| 2026-04-12 05:00 | 116800.67 | ||
| 2026-04-12 11:00 | 117683 | ||
| 2026-04-12 17:00 | 118684.75 | ||
| 2026-04-12 23:00 | 119735.39 | ||
| 2026-04-13 05:00 | 120726.29 | ||
| 2026-04-13 11:00 | 121593.95 | ||
| 2026-04-13 17:00 | 122348.4 | ||
| 2026-04-13 23:00 | 122988.6 | ||
| 2026-04-14 05:00 | 123533.7 | ||
| 2026-04-14 11:00 | 124020.68 | ||
| 2026-04-14 17:00 | 124470.36 | ||
| 2026-04-14 23:00 | 124888.61 | ||
| 2026-04-15 05:00 | 125258.8 | ||
| 2026-04-15 11:00 | 125570.66 | ||
| 2026-04-15 17:00 | 125827.02 | ||
| 2026-04-15 23:00 | 126051.24 | ||
| 2026-04-16 05:00 | 126259.16 | ||
| 2026-04-16 11:00 | 126462.3 | ||
| 2026-04-16 17:00 | 126653.37 | ||
| 2026-04-16 23:00 | 126821.49 | ||
| 2026-04-17 05:00 | 126950.2 | ||
| 2026-04-17 11:00 | 127188.46 | ||
| 2026-04-17 17:00 | 128213.24 | ||
| 2026-04-17 23:00 | 129822.3 | ||
| 2026-04-18 05:00 | 129823.3 | ||