COLUMBIA--GRAND COULEE DAM (GCDW1)
| Observed | Forecast/Trend Issued: 2026-07-03 09:27 PDT | ||
| Date/Time (PDT) | Inflow | Date/Time (PDT) | Inflow |
| 2026-07-03 00:00 | 153100 | 2026-07-03 23:00 | 152874.89 |
| 2026-07-02 00:00 | 144600 | 2026-07-04 05:00 | 150851.23 |
| 2026-07-01 00:00 | 133900 | 2026-07-04 11:00 | 149010.86 |
| 2026-06-30 00:00 | 131300 | 2026-07-04 17:00 | 147725.46 |
| 2026-06-29 00:00 | 126100 | 2026-07-04 23:00 | 146958.04 |
| 2026-06-28 00:00 | 127200 | 2026-07-05 05:00 | 146352.07 |
| 2026-06-27 00:00 | 146500 | 2026-07-05 11:00 | 145582.95 |
| 2026-06-26 00:00 | 141400 | 2026-07-05 17:00 | 144530.49 |
| 2026-06-25 00:00 | 134800 | 2026-07-05 23:00 | 143192.99 |
| 2026-06-24 00:00 | 138200 | 2026-07-06 05:00 | 141587.81 |
| 2026-06-23 00:00 | 162500 | 2026-07-06 11:00 | 139870.79 |
| 2026-07-06 17:00 | 138164.63 | ||
| 2026-07-06 23:00 | 136516.43 | ||
| 2026-07-07 05:00 | 134935.99 | ||
| 2026-07-07 11:00 | 133418.43 | ||
| 2026-07-07 17:00 | 131969.13 | ||
| 2026-07-07 23:00 | 130616.23 | ||
| 2026-07-08 05:00 | 129416.98 | ||
| 2026-07-08 11:00 | 128383.59 | ||
| 2026-07-08 17:00 | 127462.27 | ||
| 2026-07-08 23:00 | 126601.2 | ||
| 2026-07-09 05:00 | 125776.12 | ||
| 2026-07-09 11:00 | 124972.03 | ||
| 2026-07-09 17:00 | 124184.71 | ||
| 2026-07-09 23:00 | 123416.24 | ||
| 2026-07-10 05:00 | 122802.81 | ||
| 2026-07-10 11:00 | 122587.87 | ||
| 2026-07-10 17:00 | 122544.59 | ||
| 2026-07-10 23:00 | 122165.43 | ||
| 2026-07-11 05:00 | 121455.21 | ||
| 2026-07-11 11:00 | 120629.93 | ||
| 2026-07-11 17:00 | 119803.7 | ||
| 2026-07-11 23:00 | 119025.33 | ||
| 2026-07-12 05:00 | 118314.64 | ||
| 2026-07-12 11:00 | 117668.55 | ||
| 2026-07-12 17:00 | 117076.42 | ||
| 2026-07-12 23:00 | 116530.25 | ||
| 2026-07-13 05:00 | 116021.82 | ||