COLUMBIA--GRAND COULEE DAM (GCDW1)
| Observed |
| Date/Time (PDT) | Discharge |
| 2026-06-11 23:00 | 133650 | | |
| 2026-06-11 22:00 | 146188 | | |
| 2026-06-11 21:00 | 155031 | | |
| 2026-06-11 20:00 | 158431 | | |
| 2026-06-11 19:00 | 155750 | | |
| 2026-06-11 18:00 | 148144 | | |
| 2026-06-11 17:00 | 137375 | | |
| 2026-06-11 16:00 | 125375 | | |
| 2026-06-11 15:00 | 115081 | | |
| 2026-06-11 14:00 | 108025 | | |
| 2026-06-11 13:00 | 103019 | | |
| 2026-06-11 12:00 | 99356 | | |
| 2026-06-11 11:00 | 98744 | | |
| 2026-06-11 10:00 | 102200 | | |
| 2026-06-11 09:00 | 107944 | | |
| 2026-06-11 08:00 | 112994 | | |
| 2026-06-11 07:00 | 113794 | | |
| 2026-06-11 06:00 | 108844 | | |
| 2026-06-11 05:00 | 102213 | | |
| 2026-06-11 04:00 | 99581 | | |
| 2026-06-11 03:00 | 102487 | | |
| 2026-06-11 02:00 | 109569 | | |
| 2026-06-11 01:00 | 120562 | | |
| 2026-06-11 00:00 | 133750 | | |
| 2026-06-10 23:00 | 143531 | | |
| 2026-06-10 22:00 | 147644 | | |
| 2026-06-10 21:00 | 149162 | | |
| 2026-06-10 20:00 | 149075 | | |
| 2026-06-10 19:00 | 144238 | | |
| 2026-06-10 18:00 | 133012 | | |
| 2026-06-10 17:00 | 119881 | | |
| 2026-06-10 16:00 | 111600 | | |
| 2026-06-10 15:00 | 109631 | | |
| 2026-06-10 14:00 | 108213 | | |
| 2026-06-10 13:00 | 100969 | | |
| 2026-06-10 12:00 | 90350 | | |
| 2026-06-10 11:00 | 85894 | | |
| 2026-06-10 10:00 | 92075 | | |
| 2026-06-10 09:00 | 104256 | | |
| 2026-06-10 08:00 | 115294 | | |
| 2026-06-10 07:00 | 120000 | | |
| 2026-06-10 06:00 | 116181 | | |
| 2026-06-10 05:00 | 106769 | | |
| 2026-06-10 04:00 | 98125 | | |
| 2026-06-10 03:00 | 94325 | | |
| 2026-06-10 02:00 | 96075 | | |
| 2026-06-10 01:00 | 102638 | | |
| 2026-06-10 00:00 | 112444 | | |
| 2026-06-09 23:00 | 123075 | | |
| 2026-06-09 22:00 | 131056 | | |
| 2026-06-09 21:00 | 133775 | | |
| 2026-06-09 20:00 | 130375 | | |
| 2026-06-09 19:00 | 120831 | | |
| 2026-06-09 18:00 | 107950 | | |
| 2026-06-09 17:00 | 97375 | | |
| 2026-06-09 16:00 | 93044 | | |
| 2026-06-09 15:00 | 94350 | | |
| 2026-06-09 14:00 | 98000 | | |
| 2026-06-09 13:00 | 102706 | | |
| 2026-06-09 12:00 | 108894 | | |
| 2026-06-09 11:00 | 114906 | | |
| 2026-06-09 10:00 | 119100 | | |
| 2026-06-09 09:00 | 121269 | | |
| 2026-06-09 08:00 | 121219 | | |
| 2026-06-09 07:00 | 119362 | | |
| 2026-06-09 06:00 | 115706 | | |
| 2026-06-09 05:00 | 111450 | | |
| 2026-06-09 04:00 | 111906 | | |
| 2026-06-09 03:00 | 120938 | | |
| 2026-06-09 02:00 | 134344 | | |
| 2026-06-09 01:00 | 145025 | | |
| 2026-06-09 00:00 | 152044 | | |
| 2026-06-08 23:00 | 156956 | | |
| 2026-06-08 22:00 | 158956 | | |
| 2026-06-08 21:00 | 159325 | | |
| 2026-06-08 20:00 | 160625 | | |
| 2026-06-08 19:00 | 162931 | | |
| 2026-06-08 18:00 | 164550 | | |
| 2026-06-08 17:00 | 164494 | | |
| 2026-06-08 16:00 | 163581 | | |
| 2026-06-08 15:00 | 161988 | | |
| 2026-06-08 14:00 | 158706 | | |
| 2026-06-08 13:00 | 153925 | | |
| 2026-06-08 12:00 | 150662 | | |
| 2026-06-08 11:00 | 151550 | | |
| 2026-06-08 10:00 | 154344 | | |
| 2026-06-08 09:00 | 155412 | | |
| 2026-06-08 08:00 | 153406 | | |
| 2026-06-08 07:00 | 148431 | | |
| 2026-06-08 06:00 | 143319 | | |
| 2026-06-08 05:00 | 142219 | | |
| 2026-06-08 04:00 | 145150 | | |
| 2026-06-08 03:00 | 149000 | | |
| 2026-06-08 02:00 | 152762 | | |
| 2026-06-08 01:00 | 157325 | | |
| 2026-06-08 00:00 | 162731 | | |
| 2026-06-07 23:00 | 167831 | | |
| 2026-06-07 22:00 | 171387 | | |
| 2026-06-07 21:00 | 172756 | | |
| 2026-06-07 20:00 | 169919 | | |
| 2026-06-07 19:00 | 159419 | | |
| 2026-06-07 18:00 | 143600 | | |
| 2026-06-07 17:00 | 131119 | | |
| 2026-06-07 16:00 | 125731 | | |
| 2026-06-07 15:00 | 124487 | | |
| 2026-06-07 14:00 | 124969 | | |
| 2026-06-07 13:00 | 126169 | | |
| 2026-06-07 12:00 | 127588 | | |
| 2026-06-07 11:00 | 129113 | | |
| 2026-06-07 10:00 | 128806 | | |
| 2026-06-07 09:00 | 125312 | | |
| 2026-06-07 08:00 | 123013 | | |
| 2026-06-07 07:00 | 126869 | | |
| 2026-06-07 06:00 | 133644 | | |
| 2026-06-07 05:00 | 137713 | | |
| 2026-06-07 04:00 | 139150 | | |
| 2026-06-07 03:00 | 140400 | | |
| 2026-06-07 02:00 | 143731 | | |
| 2026-06-07 01:00 | 150369 | | |
| 2026-06-07 00:00 | 158262 | | |
| 2026-06-06 23:00 | 164056 | | |
| 2026-06-06 22:00 | 167256 | | |
| 2026-06-06 21:00 | 169812 | | |
| 2026-06-06 20:00 | 170713 | | |
| 2026-06-06 19:00 | 167356 | | |
| 2026-06-06 18:00 | 161925 | | |
| 2026-06-06 17:00 | 157713 | | |
| 2026-06-06 16:00 | 154806 | | |
| 2026-06-06 15:00 | 153450 | | |
| 2026-06-06 14:00 | 153262 | | |
| 2026-06-06 13:00 | 151781 | | |
| 2026-06-06 12:00 | 148819 | | |
| 2026-06-06 11:00 | 145938 | | |
| 2026-06-06 10:00 | 142012 | | |
| 2026-06-06 09:00 | 137012 | | |
| 2026-06-06 08:00 | 136363 | | |
| 2026-06-06 07:00 | 143606 | | |
| 2026-06-06 06:00 | 153662 | | |
| 2026-06-06 05:00 | 159300 | | |
| 2026-06-06 04:00 | 159412 | | |
| 2026-06-06 03:00 | 159131 | | |
| 2026-06-06 02:00 | 162688 | | |
| 2026-06-06 01:00 | 166900 | | |
| 2026-06-06 00:00 | 167400 | | |
| 2026-06-05 23:00 | 165812 | | |
| 2026-06-05 22:00 | 165137 | | |
| 2026-06-05 21:00 | 166188 | | |
| 2026-06-05 20:00 | 168231 | | |
| 2026-06-05 19:00 | 169438 | | |
| 2026-06-05 18:00 | 169225 | | |
| 2026-06-05 17:00 | 168169 | | |
| 2026-06-05 16:00 | 166500 | | |
| 2026-06-05 15:00 | 165731 | | |
| 2026-06-05 14:00 | 166319 | | |
| 2026-06-05 13:00 | 164387 | | |
| 2026-06-05 12:00 | 158806 | | |
| 2026-06-05 11:00 | 154850 | | |
| 2026-06-05 10:00 | 154069 | | |
| 2026-06-05 09:00 | 153000 | | |
| 2026-06-05 08:00 | 153500 | | |
| 2026-06-05 07:00 | 157269 | | |
| 2026-06-05 06:00 | 156900 | | |
| 2026-06-05 05:00 | 149113 | | |
| 2026-06-05 04:00 | 141463 | | |
| 2026-06-05 03:00 | 139425 | | |
| 2026-06-05 02:00 | 143481 | | |
| 2026-06-05 01:00 | 153525 | | |
| 2026-06-05 00:00 | 165512 | | |
| 2026-06-04 23:00 | 171875 | | |
| 2026-06-04 22:00 | 170113 | | |
| 2026-06-04 21:00 | 165287 | | |
| 2026-06-04 20:00 | 162644 | | |
| 2026-06-04 19:00 | 162169 | | |
| 2026-06-04 18:00 | 161150 | | |
| 2026-06-04 17:00 | 158831 | | |
| 2026-06-04 16:00 | 156456 | | |
| 2026-06-04 15:00 | 155425 | | |
| 2026-06-04 14:00 | 156925 | | |
| 2026-06-04 13:00 | 161169 | | |
| 2026-06-04 12:00 | 167262 | | |
| 2026-06-04 11:00 | 173213 | | |
| 2026-06-04 10:00 | 176231 | | |
| 2026-06-04 09:00 | 174869 | | |
| 2026-06-04 08:00 | 171169 | | |
| 2026-06-04 07:00 | 170019 | | |
| 2026-06-04 06:00 | 173012 | | |
| 2026-06-04 05:00 | 175831 | | |
| 2026-06-04 04:00 | 174206 | | |
| 2026-06-04 03:00 | 168519 | | |
| 2026-06-04 02:00 | 163338 | | |
| 2026-06-04 01:00 | 162556 | | |
| 2026-06-04 00:00 | 164444 | | |
| 2026-06-03 23:00 | 164812 | | |
| 2026-06-03 22:00 | 164275 | | |
| 2026-06-03 21:00 | 166044 | | |
| 2026-06-03 20:00 | 168881 | | |
| 2026-06-03 19:00 | 169250 | | |
| 2026-06-03 18:00 | 167338 | | |
| 2026-06-03 17:00 | 166688 | | |
| 2026-06-03 16:00 | 167400 | | |
| 2026-06-03 15:00 | 166669 | | |
| 2026-06-03 14:00 | 167156 | | |
| 2026-06-03 13:00 | 171281 | | |
| 2026-06-03 12:00 | 173544 | | |
| 2026-06-03 11:00 | 170706 | | |
| 2026-06-03 10:00 | 167775 | | |
| 2026-06-03 09:00 | 169062 | | |
| 2026-06-03 08:00 | 173056 | | |
| 2026-06-03 07:00 | 176350 | | |
| 2026-06-03 06:00 | 177456 | | |
| 2026-06-03 05:00 | 177144 | | |
| 2026-06-03 04:00 | 176419 | | |
| 2026-06-03 03:00 | 176113 | | |
| 2026-06-03 02:00 | 177812 | | |
| 2026-06-03 01:00 | 181287 | | |
| 2026-06-03 00:00 | 183825 | | |
| 2026-06-02 23:00 | 183969 | | |
| 2026-06-02 22:00 | 182750 | | |
| 2026-06-02 21:00 | 181831 | | |
| 2026-06-02 20:00 | 181725 | | |
| 2026-06-02 19:00 | 181550 | | |
| 2026-06-02 18:00 | 180162 | | |
| 2026-06-02 17:00 | 177500 | | |
| 2026-06-02 16:00 | 174525 | | |
| 2026-06-02 15:00 | 171519 | | |
| 2026-06-02 14:00 | 167719 | | |
| 2026-06-02 13:00 | 162431 | | |
| 2026-06-02 12:00 | 156569 | | |
| 2026-06-02 11:00 | 152894 | | |
| 2026-06-02 10:00 | 153088 | | |
| 2026-06-02 09:00 | 156231 | | |
| 2026-06-02 08:00 | 159944 | | |
| 2026-06-02 07:00 | 161275 | | |
| 2026-06-02 06:00 | 158894 | | |
| 2026-06-02 05:00 | 155550 | | |
| 2026-06-02 04:00 | 155512 | | |
| 2026-06-02 03:00 | 160119 | | |
| 2026-06-02 02:00 | 168044 | | |
| 2026-06-02 01:00 | 176025 | | |
| 2026-06-02 00:00 | 179881 | | |
| 2026-06-01 23:00 | 178900 | | |
| 2026-06-01 22:00 | 176287 | | |
| 2026-06-01 21:00 | 174550 | | |
| 2026-06-01 20:00 | 172750 | | |
| 2026-06-01 19:00 | 169938 | | |
| 2026-06-01 18:00 | 169231 | | |
| 2026-06-01 17:00 | 173056 | | |