COLUMBIA--GRAND COULEE DAM (GCDW1)
| Observed |
| Date/Time (PDT) | Discharge |
| 2026-08-28 17:00 | 92463 | | |
| 2026-08-28 16:00 | 88119 | | |
| 2026-08-28 15:00 | 84487 | | |
| 2026-08-28 14:00 | 82350 | | |
| 2026-08-28 13:00 | 81444 | | |
| 2026-08-28 12:00 | 81419 | | |
| 2026-08-28 11:00 | 81044 | | |
| 2026-08-28 10:00 | 79250 | | |
| 2026-08-28 09:00 | 76019 | | |
| 2026-08-28 08:00 | 71600 | | |
| 2026-08-28 07:00 | 65925 | | |
| 2026-08-28 06:00 | 58425 | | |
| 2026-08-28 05:00 | 50306 | | |
| 2026-08-28 04:00 | 46231 | | |
| 2026-08-28 03:00 | 50131 | | |
| 2026-08-28 02:00 | 59269 | | |
| 2026-08-28 01:00 | 66794 | | |
| 2026-08-28 00:00 | 71894 | | |
| 2026-08-27 23:00 | 80031 | | |
| 2026-08-27 22:00 | 91494 | | |
| 2026-08-27 21:00 | 101600 | | |
| 2026-08-27 20:00 | 110250 | | |
| 2026-08-27 19:00 | 118412 | | |
| 2026-08-27 18:00 | 122650 | | |
| 2026-08-27 17:00 | 119700 | | |
| 2026-08-27 16:00 | 110806 | | |
| 2026-08-27 15:00 | 100250 | | |
| 2026-08-27 14:00 | 90625 | | |
| 2026-08-27 13:00 | 82644 | | |
| 2026-08-27 12:00 | 77831 | | |
| 2026-08-27 11:00 | 77475 | | |
| 2026-08-27 10:00 | 77844 | | |
| 2026-08-27 09:00 | 71756 | | |
| 2026-08-27 08:00 | 60419 | | |
| 2026-08-27 07:00 | 51144 | | |
| 2026-08-27 06:00 | 45031 | | |
| 2026-08-27 05:00 | 41612 | | |
| 2026-08-27 04:00 | 42775 | | |
| 2026-08-27 03:00 | 47150 | | |
| 2026-08-27 02:00 | 54000 | | |
| 2026-08-27 01:00 | 66237 | | |
| 2026-08-27 00:00 | 83912 | | |
| 2026-08-26 23:00 | 103763 | | |
| 2026-08-26 22:00 | 123056 | | |
| 2026-08-26 21:00 | 140369 | | |
| 2026-08-26 20:00 | 156238 | | |
| 2026-08-26 19:00 | 167912 | | |
| 2026-08-26 18:00 | 166356 | | |
| 2026-08-26 17:00 | 148856 | | |
| 2026-08-26 16:00 | 125319 | | |
| 2026-08-26 15:00 | 104169 | | |
| 2026-08-26 14:00 | 85875 | | |
| 2026-08-26 13:00 | 72088 | | |
| 2026-08-26 12:00 | 64612 | | |
| 2026-08-26 11:00 | 60981 | | |
| 2026-08-26 10:00 | 60288 | | |
| 2026-08-26 09:00 | 62675 | | |
| 2026-08-26 08:00 | 65213 | | |
| 2026-08-26 07:00 | 64756 | | |
| 2026-08-26 06:00 | 60931 | | |
| 2026-08-26 05:00 | 56869 | | |
| 2026-08-26 04:00 | 56306 | | |
| 2026-08-26 03:00 | 60112 | | |
| 2026-08-26 02:00 | 67769 | | |
| 2026-08-26 01:00 | 78838 | | |
| 2026-08-26 00:00 | 92106 | | |
| 2026-08-25 23:00 | 106844 | | |
| 2026-08-25 22:00 | 124919 | | |
| 2026-08-25 21:00 | 146531 | | |
| 2026-08-25 20:00 | 165625 | | |
| 2026-08-25 19:00 | 175900 | | |
| 2026-08-25 18:00 | 175125 | | |
| 2026-08-25 17:00 | 163219 | | |
| 2026-08-25 16:00 | 146137 | | |
| 2026-08-25 15:00 | 132287 | | |
| 2026-08-25 14:00 | 120925 | | |
| 2026-08-25 13:00 | 107487 | | |
| 2026-08-25 12:00 | 93044 | | |
| 2026-08-25 11:00 | 80306 | | |
| 2026-08-25 10:00 | 69825 | | |
| 2026-08-25 09:00 | 61462 | | |
| 2026-08-25 08:00 | 55225 | | |
| 2026-08-25 07:00 | 49819 | | |
| 2026-08-25 06:00 | 43231 | | |
| 2026-08-25 05:00 | 36975 | | |
| 2026-08-25 04:00 | 35337 | | |
| 2026-08-25 03:00 | 39712 | | |
| 2026-08-25 02:00 | 48719 | | |
| 2026-08-25 01:00 | 61569 | | |
| 2026-08-25 00:00 | 77300 | | |
| 2026-08-24 23:00 | 94975 | | |
| 2026-08-24 22:00 | 115681 | | |
| 2026-08-24 21:00 | 139300 | | |
| 2026-08-24 20:00 | 158969 | | |
| 2026-08-24 19:00 | 166363 | | |
| 2026-08-24 18:00 | 162088 | | |
| 2026-08-24 17:00 | 150713 | | |
| 2026-08-24 16:00 | 134688 | | |
| 2026-08-24 15:00 | 118319 | | |
| 2026-08-24 14:00 | 104331 | | |
| 2026-08-24 13:00 | 91081 | | |
| 2026-08-24 12:00 | 77838 | | |
| 2026-08-24 11:00 | 66375 | | |
| 2026-08-24 10:00 | 58894 | | |
| 2026-08-24 09:00 | 55106 | | |
| 2026-08-24 08:00 | 52106 | | |
| 2026-08-24 07:00 | 48850 | | |
| 2026-08-24 06:00 | 46469 | | |
| 2026-08-24 05:00 | 45369 | | |
| 2026-08-24 04:00 | 46413 | | |
| 2026-08-24 03:00 | 51625 | | |
| 2026-08-24 02:00 | 62269 | | |
| 2026-08-24 01:00 | 75725 | | |
| 2026-08-24 00:00 | 86112 | | |
| 2026-08-23 23:00 | 92737 | | |
| 2026-08-23 22:00 | 100475 | | |
| 2026-08-23 21:00 | 111056 | | |
| 2026-08-23 20:00 | 122125 | | |
| 2026-08-23 19:00 | 128875 | | |
| 2026-08-23 18:00 | 126513 | | |
| 2026-08-23 17:00 | 116200 | | |
| 2026-08-23 16:00 | 102994 | | |
| 2026-08-23 15:00 | 89375 | | |
| 2026-08-23 14:00 | 76581 | | |
| 2026-08-23 13:00 | 67362 | | |
| 2026-08-23 12:00 | 62175 | | |
| 2026-08-23 11:00 | 57837 | | |
| 2026-08-23 10:00 | 52856 | | |
| 2026-08-23 09:00 | 48144 | | |
| 2026-08-23 08:00 | 43781 | | |
| 2026-08-23 07:00 | 39600 | | |
| 2026-08-23 06:00 | 35650 | | |
| 2026-08-23 05:00 | 31837 | | |
| 2026-08-23 04:00 | 29488 | | |
| 2026-08-23 03:00 | 30475 | | |
| 2026-08-23 02:00 | 34519 | | |
| 2026-08-23 01:00 | 40788 | | |
| 2026-08-23 00:00 | 50038 | | |
| 2026-08-22 23:00 | 62706 | | |
| 2026-08-22 22:00 | 77481 | | |
| 2026-08-22 21:00 | 92806 | | |
| 2026-08-22 20:00 | 107769 | | |
| 2026-08-22 19:00 | 119963 | | |
| 2026-08-22 18:00 | 124338 | | |
| 2026-08-22 17:00 | 116737 | | |
| 2026-08-22 16:00 | 99706 | | |
| 2026-08-22 15:00 | 82713 | | |
| 2026-08-22 14:00 | 72725 | | |
| 2026-08-22 13:00 | 68600 | | |
| 2026-08-22 12:00 | 66825 | | |
| 2026-08-22 11:00 | 65119 | | |
| 2026-08-22 10:00 | 60987 | | |
| 2026-08-22 09:00 | 53906 | | |
| 2026-08-22 08:00 | 47300 | | |
| 2026-08-22 07:00 | 43700 | | |
| 2026-08-22 06:00 | 41538 | | |
| 2026-08-22 05:00 | 39556 | | |
| 2026-08-22 04:00 | 39112 | | |
| 2026-08-22 03:00 | 41756 | | |
| 2026-08-22 02:00 | 47688 | | |
| 2026-08-22 01:00 | 55612 | | |
| 2026-08-22 00:00 | 64737 | | |
| 2026-08-21 23:00 | 76338 | | |
| 2026-08-21 22:00 | 90506 | | |
| 2026-08-21 21:00 | 105388 | | |
| 2026-08-21 20:00 | 121225 | | |
| 2026-08-21 19:00 | 136306 | | |
| 2026-08-21 18:00 | 143475 | | |
| 2026-08-21 17:00 | 139550 | | |
| 2026-08-21 16:00 | 128625 | | |
| 2026-08-21 15:00 | 114844 | | |
| 2026-08-21 14:00 | 98912 | | |
| 2026-08-21 13:00 | 81487 | | |
| 2026-08-21 12:00 | 66800 | | |
| 2026-08-21 11:00 | 58388 | | |
| 2026-08-21 10:00 | 55325 | | |
| 2026-08-21 09:00 | 55081 | | |
| 2026-08-21 08:00 | 55606 | | |
| 2026-08-21 07:00 | 54819 | | |
| 2026-08-21 06:00 | 51200 | | |
| 2026-08-21 05:00 | 46594 | | |
| 2026-08-21 04:00 | 45513 | | |
| 2026-08-21 03:00 | 50862 | | |
| 2026-08-21 02:00 | 61756 | | |
| 2026-08-21 01:00 | 74688 | | |
| 2026-08-21 00:00 | 87850 | | |
| 2026-08-20 23:00 | 103044 | | |
| 2026-08-20 22:00 | 122506 | | |
| 2026-08-20 21:00 | 145531 | | |
| 2026-08-20 20:00 | 165750 | | |
| 2026-08-20 19:00 | 174475 | | |
| 2026-08-20 18:00 | 170525 | | |
| 2026-08-20 17:00 | 159956 | | |
| 2026-08-20 16:00 | 146300 | | |
| 2026-08-20 15:00 | 129806 | | |
| 2026-08-20 14:00 | 113175 | | |
| 2026-08-20 13:00 | 99544 | | |
| 2026-08-20 12:00 | 88950 | | |
| 2026-08-20 11:00 | 81081 | | |
| 2026-08-20 10:00 | 76394 | | |
| 2026-08-20 09:00 | 73987 | | |
| 2026-08-20 08:00 | 71006 | | |
| 2026-08-20 07:00 | 65562 | | |
| 2026-08-20 06:00 | 59075 | | |
| 2026-08-20 05:00 | 53737 | | |
| 2026-08-20 04:00 | 51237 | | |
| 2026-08-20 03:00 | 52763 | | |
| 2026-08-20 02:00 | 57663 | | |
| 2026-08-20 01:00 | 65575 | | |
| 2026-08-20 00:00 | 78281 | | |
| 2026-08-19 23:00 | 97531 | | |
| 2026-08-19 22:00 | 122987 | | |
| 2026-08-19 21:00 | 150750 | | |
| 2026-08-19 20:00 | 172050 | | |
| 2026-08-19 19:00 | 177200 | | |
| 2026-08-19 18:00 | 164731 | | |
| 2026-08-19 17:00 | 142113 | | |
| 2026-08-19 16:00 | 117925 | | |
| 2026-08-19 15:00 | 98456 | | |
| 2026-08-19 14:00 | 86963 | | |
| 2026-08-19 13:00 | 82756 | | |
| 2026-08-19 12:00 | 82131 | | |
| 2026-08-19 11:00 | 81463 | | |
| 2026-08-19 10:00 | 79588 | | |
| 2026-08-19 09:00 | 76400 | | |
| 2026-08-19 08:00 | 72169 | | |
| 2026-08-19 07:00 | 67656 | | |
| 2026-08-19 06:00 | 63281 | | |
| 2026-08-19 05:00 | 60106 | | |
| 2026-08-19 04:00 | 59494 | | |
| 2026-08-19 03:00 | 60587 | | |
| 2026-08-19 02:00 | 61631 | | |
| 2026-08-19 01:00 | 62919 | | |
| 2026-08-19 00:00 | 66787 | | |
| 2026-08-18 23:00 | 77619 | | |
| 2026-08-18 22:00 | 98200 | | |
| 2026-08-18 21:00 | 123494 | | |
| 2026-08-18 20:00 | 142256 | | |
| 2026-08-18 19:00 | 146075 | | |
| 2026-08-18 18:00 | 137525 | | |
| 2026-08-18 17:00 | 124175 | | |
| 2026-08-18 16:00 | 108375 | | |
| 2026-08-18 15:00 | 92075 | | |
| 2026-08-18 14:00 | 79188 | | |
| 2026-08-18 13:00 | 70438 | | |
| 2026-08-18 12:00 | 64744 | | |
| 2026-08-18 11:00 | 61625 | | |
| 2026-08-18 10:00 | 60319 | | |
| 2026-08-18 09:00 | 58531 | | |
| 2026-08-18 08:00 | 54962 | | |
| 2026-08-18 07:00 | 51900 | | |
| 2026-08-18 06:00 | 50688 | | |
| 2026-08-18 05:00 | 49756 | | |
| 2026-08-18 04:00 | 49050 | | |
| 2026-08-18 03:00 | 50900 | | |
| 2026-08-18 02:00 | 57138 | | |
| 2026-08-18 01:00 | 67919 | | |
| 2026-08-18 00:00 | 83256 | | |
| 2026-08-17 23:00 | 103694 | | |
| 2026-08-17 22:00 | 128137 | | |
| 2026-08-17 21:00 | 152194 | | |
| 2026-08-17 20:00 | 168650 | | |
| 2026-08-17 19:00 | 171119 | | |
| 2026-08-17 18:00 | 159000 | | |
| 2026-08-17 17:00 | 137713 | | |