COLUMBIA--GRAND COULEE DAM (GCDW1)
| Observed | Forecast/Trend Issued: 2026-06-26 08:36 PDT | ||
| Date/Time (PDT) | Inflow | Date/Time (PDT) | Inflow |
| 2026-06-26 00:00 | 141400 | 2026-06-26 23:00 | 138533.34 |
| 2026-06-25 00:00 | 134800 | 2026-06-27 05:00 | 137482.03 |
| 2026-06-24 00:00 | 138200 | 2026-06-27 11:00 | 137706.73 |
| 2026-06-23 00:00 | 162500 | 2026-06-27 17:00 | 138411.53 |
| 2026-06-22 00:00 | 110900 | 2026-06-27 23:00 | 138779.31 |
| 2026-06-21 00:00 | 131100 | 2026-06-28 05:00 | 138668.7 |
| 2026-06-20 00:00 | 149700 | 2026-06-28 11:00 | 138334.87 |
| 2026-06-19 00:00 | 147000 | 2026-06-28 17:00 | 137963.26 |
| 2026-06-18 00:00 | 154600 | 2026-06-28 23:00 | 137687.26 |
| 2026-06-17 00:00 | 153900 | 2026-06-29 05:00 | 137672.88 |
| 2026-06-16 00:00 | 142800 | 2026-06-29 11:00 | 138060.59 |
| 2026-06-29 17:00 | 138793.47 | ||
| 2026-06-29 23:00 | 139628.62 | ||
| 2026-06-30 05:00 | 140342.86 | ||
| 2026-06-30 11:00 | 140932.28 | ||
| 2026-06-30 17:00 | 141585.07 | ||
| 2026-06-30 23:00 | 142551.04 | ||
| 2026-07-01 05:00 | 143563.48 | ||
| 2026-07-01 11:00 | 143745.21 | ||
| 2026-07-01 17:00 | 143515.79 | ||
| 2026-07-01 23:00 | 144148.38 | ||
| 2026-07-02 05:00 | 145453.7 | ||
| 2026-07-02 11:00 | 146688.72 | ||
| 2026-07-02 17:00 | 147504.62 | ||
| 2026-07-02 23:00 | 147818.53 | ||
| 2026-07-03 05:00 | 147661.33 | ||
| 2026-07-03 11:00 | 147146.12 | ||
| 2026-07-03 17:00 | 146421.74 | ||
| 2026-07-03 23:00 | 145588.65 | ||
| 2026-07-04 05:00 | 144710.13 | ||
| 2026-07-04 11:00 | 143825.84 | ||
| 2026-07-04 17:00 | 142964.19 | ||
| 2026-07-04 23:00 | 142140.27 | ||
| 2026-07-05 05:00 | 141338.73 | ||
| 2026-07-05 11:00 | 140518.14 | ||
| 2026-07-05 17:00 | 139143.19 | ||
| 2026-07-05 23:00 | 136324.54 | ||
| 2026-07-06 05:00 | 132880.63 | ||