COLUMBIA--GRAND COULEE DAM (GCDW1)
| Observed |
| Date/Time (PDT) | Discharge |
| 2026-05-05 16:00 | 153488 | | |
| 2026-05-05 15:00 | 155294 | | |
| 2026-05-05 14:00 | 154544 | | |
| 2026-05-05 13:00 | 149619 | | |
| 2026-05-05 12:00 | 141575 | | |
| 2026-05-05 11:00 | 134694 | | |
| 2026-05-05 10:00 | 131713 | | |
| 2026-05-05 09:00 | 131194 | | |
| 2026-05-05 08:00 | 129188 | | |
| 2026-05-05 07:00 | 122306 | | |
| 2026-05-05 06:00 | 111888 | | |
| 2026-05-05 05:00 | 102688 | | |
| 2026-05-05 04:00 | 97344 | | |
| 2026-05-05 03:00 | 95950 | | |
| 2026-05-05 02:00 | 100775 | | |
| 2026-05-05 01:00 | 114481 | | |
| 2026-05-05 00:00 | 133731 | | |
| 2026-05-04 23:00 | 151419 | | |
| 2026-05-04 22:00 | 162900 | | |
| 2026-05-04 21:00 | 169150 | | |
| 2026-05-04 20:00 | 174738 | | |
| 2026-05-04 19:00 | 180400 | | |
| 2026-05-04 18:00 | 181162 | | |
| 2026-05-04 17:00 | 173412 | | |
| 2026-05-04 16:00 | 161894 | | |
| 2026-05-04 15:00 | 154012 | | |
| 2026-05-04 14:00 | 148269 | | |
| 2026-05-04 13:00 | 139988 | | |
| 2026-05-04 12:00 | 131125 | | |
| 2026-05-04 11:00 | 126194 | | |
| 2026-05-04 10:00 | 128144 | | |
| 2026-05-04 09:00 | 135062 | | |
| 2026-05-04 08:00 | 138644 | | |
| 2026-05-04 07:00 | 134356 | | |
| 2026-05-04 06:00 | 125494 | | |
| 2026-05-04 05:00 | 116550 | | |
| 2026-05-04 04:00 | 111438 | | |
| 2026-05-04 03:00 | 112362 | | |
| 2026-05-04 02:00 | 119338 | | |
| 2026-05-04 01:00 | 131213 | | |
| 2026-05-04 00:00 | 144963 | | |
| 2026-05-03 23:00 | 156950 | | |
| 2026-05-03 22:00 | 163775 | | |
| 2026-05-03 21:00 | 164719 | | |
| 2026-05-03 20:00 | 162113 | | |
| 2026-05-03 19:00 | 155356 | | |
| 2026-05-03 18:00 | 144050 | | |
| 2026-05-03 17:00 | 131863 | | |
| 2026-05-03 16:00 | 120206 | | |
| 2026-05-03 15:00 | 109956 | | |
| 2026-05-03 14:00 | 104669 | | |
| 2026-05-03 13:00 | 104144 | | |
| 2026-05-03 12:00 | 103519 | | |
| 2026-05-03 11:00 | 100269 | | |
| 2026-05-03 10:00 | 97681 | | |
| 2026-05-03 09:00 | 100737 | | |
| 2026-05-03 08:00 | 108350 | | |
| 2026-05-03 07:00 | 113906 | | |
| 2026-05-03 06:00 | 115656 | | |
| 2026-05-03 05:00 | 117494 | | |
| 2026-05-03 04:00 | 121025 | | |
| 2026-05-03 03:00 | 126362 | | |
| 2026-05-03 02:00 | 134650 | | |
| 2026-05-03 01:00 | 146463 | | |
| 2026-05-03 00:00 | 160463 | | |
| 2026-05-02 23:00 | 171481 | | |
| 2026-05-02 22:00 | 175213 | | |
| 2026-05-02 21:00 | 174506 | | |
| 2026-05-02 20:00 | 170894 | | |
| 2026-05-02 19:00 | 158981 | | |
| 2026-05-02 18:00 | 137569 | | |
| 2026-05-02 17:00 | 112850 | | |
| 2026-05-02 16:00 | 91575 | | |
| 2026-05-02 15:00 | 78956 | | |
| 2026-05-02 14:00 | 75588 | | |
| 2026-05-02 13:00 | 77263 | | |
| 2026-05-02 12:00 | 80681 | | |
| 2026-05-02 11:00 | 84237 | | |
| 2026-05-02 10:00 | 87394 | | |
| 2026-05-02 09:00 | 93925 | | |
| 2026-05-02 08:00 | 109388 | | |
| 2026-05-02 07:00 | 130344 | | |
| 2026-05-02 06:00 | 145556 | | |
| 2026-05-02 05:00 | 152144 | | |
| 2026-05-02 04:00 | 156275 | | |
| 2026-05-02 03:00 | 161044 | | |
| 2026-05-02 02:00 | 166037 | | |
| 2026-05-02 01:00 | 171162 | | |
| 2026-05-02 00:00 | 176075 | | |
| 2026-05-01 23:00 | 179306 | | |
| 2026-05-01 22:00 | 180525 | | |
| 2026-05-01 21:00 | 180206 | | |
| 2026-05-01 20:00 | 174981 | | |
| 2026-05-01 19:00 | 163762 | | |
| 2026-05-01 18:00 | 154169 | | |
| 2026-05-01 17:00 | 150300 | | |
| 2026-05-01 16:00 | 147050 | | |
| 2026-05-01 15:00 | 141912 | | |
| 2026-05-01 14:00 | 136594 | | |
| 2026-05-01 13:00 | 132456 | | |
| 2026-05-01 12:00 | 132625 | | |
| 2026-05-01 11:00 | 139125 | | |
| 2026-05-01 10:00 | 149113 | | |
| 2026-05-01 09:00 | 159363 | | |
| 2026-05-01 08:00 | 169525 | | |
| 2026-05-01 07:00 | 176669 | | |
| 2026-05-01 06:00 | 175019 | | |
| 2026-05-01 05:00 | 166769 | | |
| 2026-05-01 04:00 | 160869 | | |
| 2026-05-01 03:00 | 160750 | | |
| 2026-05-01 02:00 | 164213 | | |
| 2026-05-01 01:00 | 169100 | | |
| 2026-05-01 00:00 | 172231 | | |
| 2026-04-30 23:00 | 170175 | | |
| 2026-04-30 22:00 | 166625 | | |
| 2026-04-30 21:00 | 168875 | | |
| 2026-04-30 20:00 | 171969 | | |
| 2026-04-30 19:00 | 160375 | | |
| 2026-04-30 18:00 | 131550 | | |
| 2026-04-30 17:00 | 103569 | | |
| 2026-04-30 16:00 | 91112 | | |
| 2026-04-30 15:00 | 90231 | | |
| 2026-04-30 14:00 | 91344 | | |
| 2026-04-30 13:00 | 90856 | | |
| 2026-04-30 12:00 | 90719 | | |
| 2026-04-30 11:00 | 95025 | | |
| 2026-04-30 10:00 | 106569 | | |
| 2026-04-30 09:00 | 124662 | | |
| 2026-04-30 08:00 | 143231 | | |
| 2026-04-30 07:00 | 152831 | | |
| 2026-04-30 06:00 | 150456 | | |
| 2026-04-30 05:00 | 143863 | | |
| 2026-04-30 04:00 | 140988 | | |
| 2026-04-30 03:00 | 142344 | | |
| 2026-04-30 02:00 | 146419 | | |
| 2026-04-30 01:00 | 152950 | | |
| 2026-04-30 00:00 | 159575 | | |
| 2026-04-29 23:00 | 162950 | | |
| 2026-04-29 22:00 | 163363 | | |
| 2026-04-29 21:00 | 162431 | | |
| 2026-04-29 20:00 | 157250 | | |
| 2026-04-29 19:00 | 143125 | | |
| 2026-04-29 18:00 | 123225 | | |
| 2026-04-29 17:00 | 108050 | | |
| 2026-04-29 16:00 | 104369 | | |
| 2026-04-29 15:00 | 110544 | | |
| 2026-04-29 14:00 | 119362 | | |
| 2026-04-29 13:00 | 124844 | | |
| 2026-04-29 12:00 | 128300 | | |
| 2026-04-29 11:00 | 134694 | | |
| 2026-04-29 10:00 | 145150 | | |
| 2026-04-29 09:00 | 156756 | | |
| 2026-04-29 08:00 | 166631 | | |
| 2026-04-29 07:00 | 171625 | | |
| 2026-04-29 06:00 | 169981 | | |
| 2026-04-29 05:00 | 165225 | | |
| 2026-04-29 04:00 | 161031 | | |
| 2026-04-29 03:00 | 157569 | | |
| 2026-04-29 02:00 | 155825 | | |
| 2026-04-29 01:00 | 156769 | | |
| 2026-04-29 00:00 | 158400 | | |
| 2026-04-28 23:00 | 159062 | | |
| 2026-04-28 22:00 | 159550 | | |
| 2026-04-28 21:00 | 159731 | | |
| 2026-04-28 20:00 | 155256 | | |
| 2026-04-28 19:00 | 141975 | | |
| 2026-04-28 18:00 | 123769 | | |
| 2026-04-28 17:00 | 109256 | | |
| 2026-04-28 16:00 | 102394 | | |
| 2026-04-28 15:00 | 101844 | | |
| 2026-04-28 14:00 | 105469 | | |
| 2026-04-28 13:00 | 110056 | | |
| 2026-04-28 12:00 | 111625 | | |
| 2026-04-28 11:00 | 110306 | | |
| 2026-04-28 10:00 | 110419 | | |
| 2026-04-28 09:00 | 116375 | | |
| 2026-04-28 08:00 | 128250 | | |
| 2026-04-28 07:00 | 139181 | | |
| 2026-04-28 06:00 | 142500 | | |
| 2026-04-28 05:00 | 139363 | | |
| 2026-04-28 04:00 | 134756 | | |
| 2026-04-28 03:00 | 131381 | | |
| 2026-04-28 02:00 | 128775 | | |
| 2026-04-28 01:00 | 125638 | | |
| 2026-04-28 00:00 | 124412 | | |
| 2026-04-27 23:00 | 129037 | | |
| 2026-04-27 22:00 | 137269 | | |
| 2026-04-27 21:00 | 143431 | | |
| 2026-04-27 20:00 | 141781 | | |
| 2026-04-27 19:00 | 126944 | | |
| 2026-04-27 18:00 | 104463 | | |
| 2026-04-27 17:00 | 88562 | | |
| 2026-04-27 16:00 | 84112 | | |
| 2026-04-27 15:00 | 86506 | | |
| 2026-04-27 14:00 | 91731 | | |
| 2026-04-27 13:00 | 97419 | | |
| 2026-04-27 12:00 | 101831 | | |
| 2026-04-27 11:00 | 104312 | | |
| 2026-04-27 10:00 | 107756 | | |
| 2026-04-27 09:00 | 116994 | | |
| 2026-04-27 08:00 | 127763 | | |
| 2026-04-27 07:00 | 129806 | | |
| 2026-04-27 06:00 | 123125 | | |
| 2026-04-27 05:00 | 115388 | | |
| 2026-04-27 04:00 | 110625 | | |
| 2026-04-27 03:00 | 107838 | | |
| 2026-04-27 02:00 | 105388 | | |
| 2026-04-27 01:00 | 104881 | | |
| 2026-04-27 00:00 | 109325 | | |
| 2026-04-26 23:00 | 119631 | | |
| 2026-04-26 22:00 | 132912 | | |
| 2026-04-26 21:00 | 142631 | | |
| 2026-04-26 20:00 | 142006 | | |
| 2026-04-26 19:00 | 129219 | | |
| 2026-04-26 18:00 | 110763 | | |
| 2026-04-26 17:00 | 96331 | | |
| 2026-04-26 16:00 | 89456 | | |
| 2026-04-26 15:00 | 88013 | | |
| 2026-04-26 14:00 | 89312 | | |
| 2026-04-26 13:00 | 91112 | | |
| 2026-04-26 12:00 | 93294 | | |
| 2026-04-26 11:00 | 97806 | | |
| 2026-04-26 10:00 | 106081 | | |
| 2026-04-26 09:00 | 117263 | | |
| 2026-04-26 08:00 | 126375 | | |
| 2026-04-26 07:00 | 128613 | | |
| 2026-04-26 06:00 | 126656 | | |
| 2026-04-26 05:00 | 125544 | | |
| 2026-04-26 04:00 | 124831 | | |
| 2026-04-26 03:00 | 123156 | | |
| 2026-04-26 02:00 | 123825 | | |
| 2026-04-26 01:00 | 132450 | | |
| 2026-04-26 00:00 | 148519 | | |
| 2026-04-25 23:00 | 162169 | | |
| 2026-04-25 22:00 | 166319 | | |
| 2026-04-25 21:00 | 164500 | | |
| 2026-04-25 20:00 | 159825 | | |
| 2026-04-25 19:00 | 146863 | | |
| 2026-04-25 18:00 | 122506 | | |
| 2026-04-25 17:00 | 94469 | | |
| 2026-04-25 16:00 | 72881 | | |
| 2026-04-25 15:00 | 62119 | | |
| 2026-04-25 14:00 | 60281 | | |
| 2026-04-25 13:00 | 63700 | | |
| 2026-04-25 12:00 | 72050 | | |
| 2026-04-25 11:00 | 86131 | | |
| 2026-04-25 10:00 | 105331 | | |
| 2026-04-25 09:00 | 128306 | | |
| 2026-04-25 08:00 | 149512 | | |
| 2026-04-25 07:00 | 161756 | | |
| 2026-04-25 06:00 | 165850 | | |
| 2026-04-25 05:00 | 166806 | | |
| 2026-04-25 04:00 | 164856 | | |
| 2026-04-25 03:00 | 159381 | | |
| 2026-04-25 02:00 | 153894 | | |
| 2026-04-25 01:00 | 152231 | | |
| 2026-04-25 00:00 | 154387 | | |
| 2026-04-24 23:00 | 157831 | | |
| 2026-04-24 22:00 | 160963 | | |
| 2026-04-24 21:00 | 163144 | | |
| 2026-04-24 20:00 | 158150 | | |
| 2026-04-24 19:00 | 136006 | | |
| 2026-04-24 18:00 | 101644 | | |
| 2026-04-24 17:00 | 72987 | | |