COLUMBIA--GRAND COULEE DAM (GCDW1)
| Observed | Forecast/Trend Issued: 2026-10-28 08:27 PDT | ||
| Date/Time (PDT) | Inflow | Date/Time (PDT) | Inflow |
| 2026-10-29 00:00 | 57700 | 2026-10-29 11:00 | 62378.02 |
| 2026-10-28 00:00 | 51500 | 2026-10-29 17:00 | 62237.94 |
| 2026-10-27 00:00 | 44200 | 2026-10-29 23:00 | 62054.37 |
| 2026-10-26 00:00 | 52600 | 2026-10-30 05:00 | 61727.44 |
| 2026-10-25 00:00 | 57400 | 2026-10-30 11:00 | 61189.03 |
| 2026-10-24 00:00 | 56200 | 2026-10-30 17:00 | 60498.05 |
| 2026-10-23 00:00 | 58200 | 2026-10-30 23:00 | 59807.47 |
| 2026-10-22 00:00 | 60500 | 2026-10-31 05:00 | 59424.75 |
| 2026-10-21 00:00 | 64800 | 2026-10-31 11:00 | 59869.55 |
| 2026-10-20 00:00 | 60100 | 2026-10-31 17:00 | 61094.7 |
| 2026-10-19 00:00 | 60200 | 2026-11-01 00:00 | 62186.96 |
| 2026-11-01 05:00 | 62617.96 | ||
| 2026-11-01 11:00 | 62699.9 | ||
| 2026-11-01 17:00 | 62756.07 | ||
| 2026-11-01 23:00 | 62755.54 | ||
| 2026-11-02 05:00 | 62706.35 | ||
| 2026-11-02 11:00 | 62650.53 | ||
| 2026-11-02 17:00 | 62596.9 | ||
| 2026-11-02 23:00 | 62540.86 | ||
| 2026-11-03 05:00 | 62480.21 | ||
| 2026-11-03 11:00 | 62418.15 | ||
| 2026-11-03 17:00 | 62354.8 | ||
| 2026-11-03 23:00 | 62284.64 | ||
| 2026-11-04 05:00 | 62200.82 | ||
| 2026-11-04 11:00 | 62099.14 | ||
| 2026-11-04 17:00 | 61972.92 | ||
| 2026-11-04 23:00 | 61814.36 | ||
| 2026-11-05 05:00 | 61710.2 | ||
| 2026-11-05 11:00 | 61903.83 | ||
| 2026-11-05 17:00 | 62485.37 | ||
| 2026-11-05 23:00 | 63145.27 | ||
| 2026-11-06 05:00 | 63552.23 | ||
| 2026-11-06 11:00 | 63676.71 | ||
| 2026-11-06 17:00 | 63637.01 | ||
| 2026-11-06 23:00 | 63535.12 | ||
| 2026-11-07 05:00 | 63420.87 | ||