COLUMBIA--GRAND COULEE DAM (GCDW1)
| Observed |
| Date/Time (PDT) | Discharge |
| 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 | | |
| 2026-08-09 16:00 | 110787 | | |
| 2026-08-09 15:00 | 98875 | | |
| 2026-08-09 14:00 | 89175 | | |
| 2026-08-09 13:00 | 81144 | | |
| 2026-08-09 12:00 | 72225 | | |
| 2026-08-09 11:00 | 62513 | | |
| 2026-08-09 10:00 | 54587 | | |
| 2026-08-09 09:00 | 48800 | | |
| 2026-08-09 08:00 | 44531 | | |
| 2026-08-09 07:00 | 42231 | | |
| 2026-08-09 06:00 | 41931 | | |
| 2026-08-09 05:00 | 42619 | | |
| 2026-08-09 04:00 | 43788 | | |
| 2026-08-09 03:00 | 46856 | | |
| 2026-08-09 02:00 | 54044 | | |
| 2026-08-09 01:00 | 66125 | | |
| 2026-08-09 00:00 | 81912 | | |
| 2026-08-08 23:00 | 100306 | | |
| 2026-08-08 22:00 | 120850 | | |
| 2026-08-08 21:00 | 140588 | | |
| 2026-08-08 20:00 | 153256 | | |
| 2026-08-08 19:00 | 154094 | | |
| 2026-08-08 18:00 | 144963 | | |
| 2026-08-08 17:00 | 131869 | | |
| 2026-08-08 16:00 | 118725 | | |
| 2026-08-08 15:00 | 107588 | | |
| 2026-08-08 14:00 | 100062 | | |
| 2026-08-08 13:00 | 94888 | | |
| 2026-08-08 12:00 | 89400 | | |
| 2026-08-08 11:00 | 82481 | | |
| 2026-08-08 10:00 | 72931 | | |
| 2026-08-08 09:00 | 60100 | | |
| 2026-08-08 08:00 | 47169 | | |
| 2026-08-08 07:00 | 39156 | | |
| 2026-08-08 06:00 | 37281 | | |
| 2026-08-08 05:00 | 38612 | | |
| 2026-08-08 04:00 | 41731 | | |
| 2026-08-08 03:00 | 48081 | | |
| 2026-08-08 02:00 | 58194 | | |
| 2026-08-08 01:00 | 71100 | | |
| 2026-08-08 00:00 | 86787 | | |
| 2026-08-07 23:00 | 106500 | | |
| 2026-08-07 22:00 | 128750 | | |
| 2026-08-07 21:00 | 147944 | | |
| 2026-08-07 20:00 | 159319 | | |
| 2026-08-07 19:00 | 161675 | | |
| 2026-08-07 18:00 | 157594 | | |
| 2026-08-07 17:00 | 152113 | | |
| 2026-08-07 16:00 | 147350 | | |
| 2026-08-07 15:00 | 140925 | | |
| 2026-08-07 14:00 | 130137 | | |
| 2026-08-07 13:00 | 115213 | | |
| 2026-08-07 12:00 | 99194 | | |
| 2026-08-07 11:00 | 85500 | | |
| 2026-08-07 10:00 | 75062 | | |
| 2026-08-07 09:00 | 66287 | | |
| 2026-08-07 08:00 | 58575 | | |
| 2026-08-07 07:00 | 53237 | | |
| 2026-08-07 06:00 | 50331 | | |
| 2026-08-07 05:00 | 47938 | | |
| 2026-08-07 04:00 | 45169 | | |
| 2026-08-07 03:00 | 44112 | | |
| 2026-08-07 02:00 | 47894 | | |
| 2026-08-07 01:00 | 57487 | | |
| 2026-08-07 00:00 | 71469 | | |
| 2026-08-06 23:00 | 88713 | | |
| 2026-08-06 22:00 | 109350 | | |
| 2026-08-06 21:00 | 131062 | | |
| 2026-08-06 20:00 | 147806 | | |
| 2026-08-06 19:00 | 155075 | | |
| 2026-08-06 18:00 | 153762 | | |
| 2026-08-06 17:00 | 147725 | | |