COLUMBIA--GRAND COULEE DAM (GCDW1)
| Observed | Forecast/Trend Issued: 2026-10-31 10:08 PDT | ||
| Date/Time (PDT) | Inflow | Date/Time (PDT) | Inflow |
| 2026-10-31 00:00 | 59200 | 2026-11-01 00:00 | 64979.87 |
| 2026-10-30 00:00 | 59000 | 2026-11-01 05:00 | 66515.61 |
| 2026-10-29 00:00 | 57700 | 2026-11-01 11:00 | 68978.88 |
| 2026-10-28 00:00 | 51500 | 2026-11-01 17:00 | 72562.3 |
| 2026-10-27 00:00 | 44200 | 2026-11-01 23:00 | 75330.48 |
| 2026-10-26 00:00 | 52600 | 2026-11-02 05:00 | 76330.4 |
| 2026-10-25 00:00 | 57400 | 2026-11-02 11:00 | 76449.37 |
| 2026-10-24 00:00 | 56200 | 2026-11-02 17:00 | 76401.85 |
| 2026-10-23 00:00 | 58200 | 2026-11-02 23:00 | 76337.08 |
| 2026-10-22 00:00 | 60500 | 2026-11-03 05:00 | 76266.5 |
| 2026-10-21 00:00 | 64800 | 2026-11-03 11:00 | 76192.61 |
| 2026-11-03 17:00 | 76118.15 | ||
| 2026-11-03 23:00 | 76042.4 | ||
| 2026-11-04 05:00 | 75963.28 | ||
| 2026-11-04 11:00 | 75878.11 | ||
| 2026-11-04 17:00 | 75777.38 | ||
| 2026-11-04 23:00 | 75660.01 | ||
| 2026-11-05 05:00 | 75528.61 | ||
| 2026-11-05 11:00 | 75361.32 | ||
| 2026-11-05 17:00 | 75106.46 | ||
| 2026-11-05 23:00 | 74741.35 | ||
| 2026-11-06 05:00 | 74316.13 | ||
| 2026-11-06 11:00 | 73919.83 | ||
| 2026-11-06 17:00 | 73611.64 | ||
| 2026-11-06 23:00 | 73404.12 | ||
| 2026-11-07 05:00 | 73279.03 | ||
| 2026-11-07 11:00 | 73220.67 | ||
| 2026-11-07 17:00 | 73234.41 | ||
| 2026-11-07 23:00 | 73284.51 | ||
| 2026-11-08 05:00 | 73287.42 | ||
| 2026-11-08 11:00 | 73202.33 | ||
| 2026-11-08 17:00 | 73054.77 | ||
| 2026-11-08 23:00 | 72884.68 | ||
| 2026-11-09 05:00 | 72704.73 | ||
| 2026-11-09 11:00 | 72513.25 | ||
| 2026-11-09 17:00 | 72313.58 | ||
| 2026-11-09 23:00 | 72116.53 | ||
| 2026-11-10 05:00 | 71935.47 | ||