COLUMBIA--GRAND COULEE DAM (GCDW1)
| Observed | Forecast/Trend Issued: 2026-08-22 09:26 PDT | ||
| Date/Time (PDT) | Inflow | Date/Time (PDT) | Inflow |
| 2026-08-22 00:00 | 81400 | 2026-08-22 11:00 | 81291.09 |
| 2026-08-21 00:00 | 86000 | 2026-08-22 17:00 | 81212.3 |
| 2026-08-20 00:00 | 83500 | 2026-08-22 23:00 | 81114.79 |
| 2026-08-19 00:00 | 80900 | 2026-08-23 05:00 | 80974.41 |
| 2026-08-18 00:00 | 78600 | 2026-08-23 11:00 | 80741.27 |
| 2026-08-17 00:00 | 80000 | 2026-08-23 17:00 | 80441.04 |
| 2026-08-16 00:00 | 81200 | 2026-08-23 23:00 | 80202.17 |
| 2026-08-15 00:00 | 83200 | 2026-08-24 05:00 | 80116.88 |
| 2026-08-14 00:00 | 85400 | 2026-08-24 11:00 | 80171.27 |
| 2026-08-13 00:00 | 87700 | 2026-08-24 17:00 | 80297.86 |
| 2026-08-12 00:00 | 82100 | 2026-08-24 23:00 | 80428.77 |
| 2026-08-25 05:00 | 80522.23 | ||
| 2026-08-25 11:00 | 80576.88 | ||
| 2026-08-25 17:00 | 80603.58 | ||
| 2026-08-25 23:00 | 80613.03 | ||
| 2026-08-26 05:00 | 80609.55 | ||
| 2026-08-26 11:00 | 80601.83 | ||
| 2026-08-26 17:00 | 80590.67 | ||
| 2026-08-26 23:00 | 80572.34 | ||
| 2026-08-27 05:00 | 80538.05 | ||
| 2026-08-27 11:00 | 80489.85 | ||
| 2026-08-27 17:00 | 80429.89 | ||
| 2026-08-27 23:00 | 80362.73 | ||
| 2026-08-28 05:00 | 80290.22 | ||
| 2026-08-28 11:00 | 80223.35 | ||
| 2026-08-28 17:00 | 80168.01 | ||
| 2026-08-28 23:00 | 80125.13 | ||
| 2026-08-29 05:00 | 79587.35 | ||
| 2026-08-29 11:00 | 77511.75 | ||
| 2026-08-29 17:00 | 74323.55 | ||
| 2026-08-29 23:00 | 71991.53 | ||
| 2026-08-30 05:00 | 71160.21 | ||
| 2026-08-30 11:00 | 71018.05 | ||
| 2026-08-30 17:00 | 71018.62 | ||
| 2026-08-30 23:00 | 71083.78 | ||
| 2026-08-31 05:00 | 71226.55 | ||
| 2026-08-31 11:00 | 71438.07 | ||
| 2026-08-31 17:00 | 71682.99 | ||
| 2026-08-31 23:00 | 71927.27 | ||
| 2026-09-01 05:00 | 72091.85 | ||