COLUMBIA--GRAND COULEE DAM (GCDW1)
| Observed | Forecast/Trend Issued: 2026-11-01 08:22 PST | ||
| Date/Time (PST) | Inflow | Date/Time (PST) | Inflow |
| 2026-11-01 00:00 | 58000 | 2026-11-01 22:00 | 75214.9 |
| 2026-10-30 23:00 | 59200 | 2026-11-02 04:00 | 76277.61 |
| 2026-10-29 23:00 | 59000 | 2026-11-02 10:00 | 76416.92 |
| 2026-10-28 23:00 | 57700 | 2026-11-02 16:00 | 76379.44 |
| 2026-10-27 23:00 | 51500 | 2026-11-02 22:00 | 76318.28 |
| 2026-10-26 23:00 | 44200 | 2026-11-03 04:00 | 76249.83 |
| 2026-10-25 23:00 | 52600 | 2026-11-03 10:00 | 76177.96 |
| 2026-10-24 23:00 | 57400 | 2026-11-03 16:00 | 76104.58 |
| 2026-10-23 23:00 | 56200 | 2026-11-03 22:00 | 76031.91 |
| 2026-10-22 23:00 | 58200 | 2026-11-04 04:00 | 75955.87 |
| 2026-10-21 23:00 | 60500 | 2026-11-04 10:00 | 75874.19 |
| 2026-11-04 16:00 | 75778.86 | ||
| 2026-11-04 22:00 | 75660.62 | ||
| 2026-11-05 04:00 | 75520.4 | ||
| 2026-11-05 10:00 | 75348.97 | ||
| 2026-11-05 16:00 | 75096.86 | ||
| 2026-11-05 22:00 | 74729.31 | ||
| 2026-11-06 04:00 | 74295.6 | ||
| 2026-11-06 10:00 | 73894.82 | ||
| 2026-11-06 16:00 | 73588.83 | ||
| 2026-11-06 22:00 | 73379.37 | ||
| 2026-11-07 04:00 | 73242.67 | ||
| 2026-11-07 10:00 | 73166.21 | ||
| 2026-11-07 16:00 | 73148.64 | ||
| 2026-11-07 22:00 | 73151.29 | ||
| 2026-11-08 04:00 | 73106.34 | ||
| 2026-11-08 10:00 | 73015.83 | ||
| 2026-11-08 16:00 | 72899.29 | ||
| 2026-11-08 22:00 | 72764.62 | ||
| 2026-11-09 04:00 | 72612.73 | ||
| 2026-11-09 10:00 | 72448.83 | ||
| 2026-11-09 16:00 | 72277.69 | ||
| 2026-11-09 22:00 | 72098.53 | ||
| 2026-11-10 04:00 | 71922.08 | ||
| 2026-11-10 10:00 | 71796.24 | ||
| 2026-11-10 16:00 | 71769.07 | ||
| 2026-11-10 22:00 | 71826.87 | ||
| 2026-11-11 04:00 | 71923.92 | ||