COLUMBIA--GRAND COULEE DAM (GCDW1)
| Observed |
| Date/Time (PDT) | Discharge |
| 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 | | |
| 2026-08-17 16:00 | 115388 | | |
| 2026-08-17 15:00 | 97656 | | |
| 2026-08-17 14:00 | 84638 | | |
| 2026-08-17 13:00 | 75281 | | |
| 2026-08-17 12:00 | 69612 | | |
| 2026-08-17 11:00 | 66106 | | |
| 2026-08-17 10:00 | 62494 | | |
| 2026-08-17 09:00 | 58906 | | |
| 2026-08-17 08:00 | 56950 | | |
| 2026-08-17 07:00 | 56550 | | |
| 2026-08-17 06:00 | 56519 | | |
| 2026-08-17 05:00 | 56250 | | |
| 2026-08-17 04:00 | 55906 | | |
| 2026-08-17 03:00 | 56562 | | |
| 2026-08-17 02:00 | 60138 | | |
| 2026-08-17 01:00 | 67763 | | |
| 2026-08-17 00:00 | 78475 | | |
| 2026-08-16 23:00 | 91275 | | |
| 2026-08-16 22:00 | 106125 | | |
| 2026-08-16 21:00 | 122300 | | |
| 2026-08-16 20:00 | 136050 | | |
| 2026-08-16 19:00 | 140344 | | |
| 2026-08-16 18:00 | 132481 | | |
| 2026-08-16 17:00 | 118706 | | |
| 2026-08-16 16:00 | 106300 | | |
| 2026-08-16 15:00 | 97344 | | |
| 2026-08-16 14:00 | 90600 | | |
| 2026-08-16 13:00 | 84050 | | |
| 2026-08-16 12:00 | 76638 | | |
| 2026-08-16 11:00 | 69263 | | |
| 2026-08-16 10:00 | 62888 | | |
| 2026-08-16 09:00 | 57325 | | |
| 2026-08-16 08:00 | 52950 | | |
| 2026-08-16 07:00 | 50894 | | |
| 2026-08-16 06:00 | 51125 | | |
| 2026-08-16 05:00 | 52131 | | |
| 2026-08-16 04:00 | 52744 | | |
| 2026-08-16 03:00 | 53487 | | |
| 2026-08-16 02:00 | 55981 | | |
| 2026-08-16 01:00 | 60956 | | |
| 2026-08-16 00:00 | 68800 | | |
| 2026-08-15 23:00 | 80875 | | |
| 2026-08-15 22:00 | 96025 | | |
| 2026-08-15 21:00 | 110362 | | |
| 2026-08-15 20:00 | 121425 | | |
| 2026-08-15 19:00 | 127631 | | |
| 2026-08-15 18:00 | 127819 | | |
| 2026-08-15 17:00 | 122781 | | |
| 2026-08-15 16:00 | 114294 | | |
| 2026-08-15 15:00 | 104244 | | |
| 2026-08-15 14:00 | 95362 | | |
| 2026-08-15 13:00 | 89987 | | |
| 2026-08-15 12:00 | 87338 | | |
| 2026-08-15 11:00 | 85069 | | |
| 2026-08-15 10:00 | 81969 | | |
| 2026-08-15 09:00 | 77225 | | |
| 2026-08-15 08:00 | 71356 | | |
| 2026-08-15 07:00 | 66438 | | |
| 2026-08-15 06:00 | 63100 | | |
| 2026-08-15 05:00 | 61450 | | |
| 2026-08-15 04:00 | 62525 | | |
| 2026-08-15 03:00 | 65787 | | |
| 2026-08-15 02:00 | 69869 | | |
| 2026-08-15 01:00 | 75544 | | |
| 2026-08-15 00:00 | 84075 | | |
| 2026-08-14 23:00 | 94769 | | |
| 2026-08-14 22:00 | 106119 | | |
| 2026-08-14 21:00 | 117644 | | |
| 2026-08-14 20:00 | 128894 | | |
| 2026-08-14 19:00 | 137056 | | |
| 2026-08-14 18:00 | 139025 | | |
| 2026-08-14 17:00 | 134150 | | |
| 2026-08-14 16:00 | 122444 | | |
| 2026-08-14 15:00 | 106438 | | |
| 2026-08-14 14:00 | 93969 | | |
| 2026-08-14 13:00 | 89963 | | |
| 2026-08-14 12:00 | 90487 | | |
| 2026-08-14 11:00 | 89862 | | |
| 2026-08-14 10:00 | 85669 | | |
| 2026-08-14 09:00 | 79231 | | |
| 2026-08-14 08:00 | 73719 | | |
| 2026-08-14 07:00 | 69269 | | |
| 2026-08-14 06:00 | 64706 | | |
| 2026-08-14 05:00 | 61081 | | |
| 2026-08-14 04:00 | 59975 | | |
| 2026-08-14 03:00 | 61938 | | |
| 2026-08-14 02:00 | 66125 | | |
| 2026-08-14 01:00 | 71169 | | |
| 2026-08-14 00:00 | 77338 | | |
| 2026-08-13 23:00 | 85569 | | |
| 2026-08-13 22:00 | 95406 | | |
| 2026-08-13 21:00 | 106300 | | |
| 2026-08-13 20:00 | 117594 | | |
| 2026-08-13 19:00 | 127119 | | |
| 2026-08-13 18:00 | 131850 | | |
| 2026-08-13 17:00 | 128588 | | |
| 2026-08-13 16:00 | 118112 | | |
| 2026-08-13 15:00 | 107400 | | |
| 2026-08-13 14:00 | 101694 | | |
| 2026-08-13 13:00 | 100263 | | |
| 2026-08-13 12:00 | 99500 | | |
| 2026-08-13 11:00 | 95550 | | |
| 2026-08-13 10:00 | 88919 | | |
| 2026-08-13 09:00 | 84369 | | |
| 2026-08-13 08:00 | 83487 | | |
| 2026-08-13 07:00 | 82244 | | |
| 2026-08-13 06:00 | 76600 | | |
| 2026-08-13 05:00 | 67581 | | |
| 2026-08-13 04:00 | 59019 | | |
| 2026-08-13 03:00 | 53900 | | |
| 2026-08-13 02:00 | 53975 | | |
| 2026-08-13 01:00 | 59800 | | |
| 2026-08-13 00:00 | 71812 | | |
| 2026-08-12 23:00 | 88737 | | |
| 2026-08-12 22:00 | 106550 | | |
| 2026-08-12 21:00 | 122456 | | |
| 2026-08-12 20:00 | 134650 | | |
| 2026-08-12 19:00 | 141037 | | |
| 2026-08-12 18:00 | 142394 | | |
| 2026-08-12 17:00 | 140644 | | |
| 2026-08-12 16:00 | 135169 | | |
| 2026-08-12 15:00 | 125700 | | |
| 2026-08-12 14:00 | 114844 | | |
| 2026-08-12 13:00 | 105263 | | |
| 2026-08-12 12:00 | 98156 | | |
| 2026-08-12 11:00 | 93606 | | |
| 2026-08-12 10:00 | 89169 | | |
| 2026-08-12 09:00 | 81775 | | |
| 2026-08-12 08:00 | 71312 | | |
| 2026-08-12 07:00 | 59712 | | |
| 2026-08-12 06:00 | 50094 | | |
| 2026-08-12 05:00 | 45506 | | |
| 2026-08-12 04:00 | 46025 | | |
| 2026-08-12 03:00 | 50556 | | |
| 2026-08-12 02:00 | 59369 | | |
| 2026-08-12 01:00 | 72675 | | |
| 2026-08-12 00:00 | 89862 | | |
| 2026-08-11 23:00 | 109569 | | |
| 2026-08-11 22:00 | 127881 | | |
| 2026-08-11 21:00 | 139019 | | |
| 2026-08-11 20:00 | 142238 | | |
| 2026-08-11 19:00 | 143100 | | |
| 2026-08-11 18:00 | 145031 | | |
| 2026-08-11 17:00 | 146000 | | |
| 2026-08-11 16:00 | 142137 | | |
| 2026-08-11 15:00 | 132469 | | |
| 2026-08-11 14:00 | 120331 | | |
| 2026-08-11 13:00 | 108744 | | |
| 2026-08-11 12:00 | 98025 | | |
| 2026-08-11 11:00 | 87281 | | |
| 2026-08-11 10:00 | 76675 | | |
| 2026-08-11 09:00 | 68619 | | |
| 2026-08-11 08:00 | 63994 | | |
| 2026-08-11 07:00 | 60638 | | |
| 2026-08-11 06:00 | 57069 | | |
| 2026-08-11 05:00 | 53969 | | |
| 2026-08-11 04:00 | 53112 | | |
| 2026-08-11 03:00 | 55850 | | |
| 2026-08-11 02:00 | 61462 | | |
| 2026-08-11 01:00 | 68237 | | |
| 2026-08-11 00:00 | 77912 | | |
| 2026-08-10 23:00 | 93706 | | |
| 2026-08-10 22:00 | 112412 | | |
| 2026-08-10 21:00 | 127094 | | |
| 2026-08-10 20:00 | 134394 | | |
| 2026-08-10 19:00 | 134306 | | |
| 2026-08-10 18:00 | 129481 | | |
| 2026-08-10 17:00 | 123588 | | |
| 2026-08-10 16:00 | 118450 | | |
| 2026-08-10 15:00 | 114494 | | |
| 2026-08-10 14:00 | 109269 | | |
| 2026-08-10 13:00 | 99006 | | |
| 2026-08-10 12:00 | 85731 | | |
| 2026-08-10 11:00 | 74850 | | |
| 2026-08-10 10:00 | 67381 | | |
| 2026-08-10 09:00 | 61619 | | |
| 2026-08-10 08:00 | 57281 | | |
| 2026-08-10 07:00 | 54669 | | |
| 2026-08-10 06:00 | 53300 | | |
| 2026-08-10 05:00 | 52400 | | |
| 2026-08-10 04:00 | 51612 | | |
| 2026-08-10 03:00 | 51269 | | |
| 2026-08-10 02:00 | 53087 | | |
| 2026-08-10 01:00 | 59663 | | |
| 2026-08-10 00:00 | 71912 | | |
| 2026-08-09 23:00 | 88487 | | |
| 2026-08-09 22:00 | 107444 | | |
| 2026-08-09 21:00 | 125344 | | |
| 2026-08-09 20:00 | 136650 | | |
| 2026-08-09 19:00 | 138662 | | |
| 2026-08-09 18:00 | 133306 | | |
| 2026-08-09 17:00 | 123169 | | |