COLUMBIA--GRAND COULEE DAM (GCDW1)
| Observed |
| Date/Time (PDT) | Discharge |
| 2026-05-17 18:00 | 100987 | | |
| 2026-05-17 17:00 | 87775 | | |
| 2026-05-17 16:00 | 81781 | | |
| 2026-05-17 15:00 | 81325 | | |
| 2026-05-17 14:00 | 84713 | | |
| 2026-05-17 13:00 | 89750 | | |
| 2026-05-17 12:00 | 94894 | | |
| 2026-05-17 11:00 | 100581 | | |
| 2026-05-17 10:00 | 105544 | | |
| 2026-05-17 09:00 | 106969 | | |
| 2026-05-17 08:00 | 105581 | | |
| 2026-05-17 07:00 | 105431 | | |
| 2026-05-17 06:00 | 107638 | | |
| 2026-05-17 05:00 | 109281 | | |
| 2026-05-17 04:00 | 109306 | | |
| 2026-05-17 03:00 | 109694 | | |
| 2026-05-17 02:00 | 112881 | | |
| 2026-05-17 01:00 | 120444 | | |
| 2026-05-17 00:00 | 130637 | | |
| 2026-05-16 23:00 | 138656 | | |
| 2026-05-16 22:00 | 141875 | | |
| 2026-05-16 21:00 | 140756 | | |
| 2026-05-16 20:00 | 133900 | | |
| 2026-05-16 19:00 | 119744 | | |
| 2026-05-16 18:00 | 100925 | | |
| 2026-05-16 17:00 | 82213 | | |
| 2026-05-16 16:00 | 68906 | | |
| 2026-05-16 15:00 | 63587 | | |
| 2026-05-16 14:00 | 62525 | | |
| 2026-05-16 13:00 | 62212 | | |
| 2026-05-16 12:00 | 64081 | | |
| 2026-05-16 11:00 | 69075 | | |
| 2026-05-16 10:00 | 76431 | | |
| 2026-05-16 09:00 | 87281 | | |
| 2026-05-16 08:00 | 103444 | | |
| 2026-05-16 07:00 | 123094 | | |
| 2026-05-16 06:00 | 139869 | | |
| 2026-05-16 05:00 | 149738 | | |
| 2026-05-16 04:00 | 155188 | | |
| 2026-05-16 03:00 | 159706 | | |
| 2026-05-16 02:00 | 164044 | | |
| 2026-05-16 01:00 | 167425 | | |
| 2026-05-16 00:00 | 169381 | | |
| 2026-05-15 23:00 | 169794 | | |
| 2026-05-15 22:00 | 168688 | | |
| 2026-05-15 21:00 | 166969 | | |
| 2026-05-15 20:00 | 162356 | | |
| 2026-05-15 19:00 | 149100 | | |
| 2026-05-15 18:00 | 128619 | | |
| 2026-05-15 17:00 | 109156 | | |
| 2026-05-15 16:00 | 94206 | | |
| 2026-05-15 15:00 | 84306 | | |
| 2026-05-15 14:00 | 79944 | | |
| 2026-05-15 13:00 | 77406 | | |
| 2026-05-15 12:00 | 74669 | | |
| 2026-05-15 11:00 | 75088 | | |
| 2026-05-15 10:00 | 80031 | | |
| 2026-05-15 09:00 | 88444 | | |
| 2026-05-15 08:00 | 101719 | | |
| 2026-05-15 07:00 | 119156 | | |
| 2026-05-15 06:00 | 133600 | | |
| 2026-05-15 05:00 | 140275 | | |
| 2026-05-15 04:00 | 142688 | | |
| 2026-05-15 03:00 | 144969 | | |
| 2026-05-15 02:00 | 147431 | | |
| 2026-05-15 01:00 | 150156 | | |
| 2026-05-15 00:00 | 153887 | | |
| 2026-05-14 23:00 | 157863 | | |
| 2026-05-14 22:00 | 159725 | | |
| 2026-05-14 21:00 | 158069 | | |
| 2026-05-14 20:00 | 151906 | | |
| 2026-05-14 19:00 | 138719 | | |
| 2026-05-14 18:00 | 119644 | | |
| 2026-05-14 17:00 | 100006 | | |
| 2026-05-14 16:00 | 83044 | | |
| 2026-05-14 15:00 | 72719 | | |
| 2026-05-14 14:00 | 72069 | | |
| 2026-05-14 13:00 | 76888 | | |
| 2026-05-14 12:00 | 83106 | | |
| 2026-05-14 11:00 | 90356 | | |
| 2026-05-14 10:00 | 98644 | | |
| 2026-05-14 09:00 | 110562 | | |
| 2026-05-14 08:00 | 126600 | | |
| 2026-05-14 07:00 | 140319 | | |
| 2026-05-14 06:00 | 146594 | | |
| 2026-05-14 05:00 | 147544 | | |
| 2026-05-14 04:00 | 147162 | | |
| 2026-05-14 03:00 | 145981 | | |
| 2026-05-14 02:00 | 143287 | | |
| 2026-05-14 01:00 | 141069 | | |
| 2026-05-14 00:00 | 143887 | | |
| 2026-05-13 23:00 | 152706 | | |
| 2026-05-13 22:00 | 161056 | | |
| 2026-05-13 21:00 | 163681 | | |
| 2026-05-13 20:00 | 158012 | | |
| 2026-05-13 19:00 | 138688 | | |
| 2026-05-13 18:00 | 110812 | | |
| 2026-05-13 17:00 | 89950 | | |
| 2026-05-13 16:00 | 79625 | | |
| 2026-05-13 15:00 | 74200 | | |
| 2026-05-13 14:00 | 72106 | | |
| 2026-05-13 13:00 | 73256 | | |
| 2026-05-13 12:00 | 77800 | | |
| 2026-05-13 11:00 | 86400 | | |
| 2026-05-13 10:00 | 98975 | | |
| 2026-05-13 09:00 | 113944 | | |
| 2026-05-13 08:00 | 124681 | | |
| 2026-05-13 07:00 | 123044 | | |
| 2026-05-13 06:00 | 110550 | | |
| 2026-05-13 05:00 | 98513 | | |
| 2026-05-13 04:00 | 96094 | | |
| 2026-05-13 03:00 | 103594 | | |
| 2026-05-13 02:00 | 115062 | | |
| 2026-05-13 01:00 | 126287 | | |
| 2026-05-13 00:00 | 139863 | | |
| 2026-05-12 23:00 | 155113 | | |
| 2026-05-12 22:00 | 163450 | | |
| 2026-05-12 21:00 | 162650 | | |
| 2026-05-12 20:00 | 160175 | | |
| 2026-05-12 19:00 | 160294 | | |
| 2026-05-12 18:00 | 159162 | | |
| 2026-05-12 17:00 | 153906 | | |
| 2026-05-12 16:00 | 148325 | | |
| 2026-05-12 15:00 | 144950 | | |
| 2026-05-12 14:00 | 140506 | | |
| 2026-05-12 13:00 | 133206 | | |
| 2026-05-12 12:00 | 126675 | | |
| 2026-05-12 11:00 | 122200 | | |
| 2026-05-12 10:00 | 115475 | | |
| 2026-05-12 09:00 | 108438 | | |
| 2026-05-12 08:00 | 110644 | | |
| 2026-05-12 07:00 | 121806 | | |
| 2026-05-12 06:00 | 128594 | | |
| 2026-05-12 05:00 | 124681 | | |
| 2026-05-12 04:00 | 119619 | | |
| 2026-05-12 03:00 | 123213 | | |
| 2026-05-12 02:00 | 135181 | | |
| 2026-05-12 01:00 | 148919 | | |
| 2026-05-12 00:00 | 157550 | | |
| 2026-05-11 23:00 | 160569 | | |
| 2026-05-11 22:00 | 161856 | | |
| 2026-05-11 21:00 | 162600 | | |
| 2026-05-11 20:00 | 162387 | | |
| 2026-05-11 19:00 | 160688 | | |
| 2026-05-11 18:00 | 154506 | | |
| 2026-05-11 17:00 | 141306 | | |
| 2026-05-11 16:00 | 124519 | | |
| 2026-05-11 15:00 | 111350 | | |
| 2026-05-11 14:00 | 104794 | | |
| 2026-05-11 13:00 | 101912 | | |
| 2026-05-11 12:00 | 100225 | | |
| 2026-05-11 11:00 | 100419 | | |
| 2026-05-11 10:00 | 103412 | | |
| 2026-05-11 09:00 | 108362 | | |
| 2026-05-11 08:00 | 112787 | | |
| 2026-05-11 07:00 | 113300 | | |
| 2026-05-11 06:00 | 107662 | | |
| 2026-05-11 05:00 | 100069 | | |
| 2026-05-11 04:00 | 98588 | | |
| 2026-05-11 03:00 | 104556 | | |
| 2026-05-11 02:00 | 112650 | | |
| 2026-05-11 01:00 | 119263 | | |
| 2026-05-11 00:00 | 125325 | | |
| 2026-05-10 23:00 | 132637 | | |
| 2026-05-10 22:00 | 141481 | | |
| 2026-05-10 21:00 | 149400 | | |
| 2026-05-10 20:00 | 150012 | | |
| 2026-05-10 19:00 | 138681 | | |
| 2026-05-10 18:00 | 118713 | | |
| 2026-05-10 17:00 | 99263 | | |
| 2026-05-10 16:00 | 87700 | | |
| 2026-05-10 15:00 | 84388 | | |
| 2026-05-10 14:00 | 85812 | | |
| 2026-05-10 13:00 | 89856 | | |
| 2026-05-10 12:00 | 96444 | | |
| 2026-05-10 11:00 | 103856 | | |
| 2026-05-10 10:00 | 107381 | | |
| 2026-05-10 09:00 | 105812 | | |
| 2026-05-10 08:00 | 104294 | | |
| 2026-05-10 07:00 | 106869 | | |
| 2026-05-10 06:00 | 111787 | | |
| 2026-05-10 05:00 | 116569 | | |
| 2026-05-10 04:00 | 122250 | | |
| 2026-05-10 03:00 | 130019 | | |
| 2026-05-10 02:00 | 139056 | | |
| 2026-05-10 01:00 | 148350 | | |
| 2026-05-10 00:00 | 156075 | | |
| 2026-05-09 23:00 | 159919 | | |
| 2026-05-09 22:00 | 161275 | | |
| 2026-05-09 21:00 | 163050 | | |
| 2026-05-09 20:00 | 161731 | | |
| 2026-05-09 19:00 | 150456 | | |
| 2026-05-09 18:00 | 131144 | | |
| 2026-05-09 17:00 | 113350 | | |
| 2026-05-09 16:00 | 101388 | | |
| 2026-05-09 15:00 | 93831 | | |
| 2026-05-09 14:00 | 89862 | | |
| 2026-05-09 13:00 | 87844 | | |
| 2026-05-09 12:00 | 86269 | | |
| 2026-05-09 11:00 | 86375 | | |
| 2026-05-09 10:00 | 88606 | | |
| 2026-05-09 09:00 | 93463 | | |
| 2026-05-09 08:00 | 105150 | | |
| 2026-05-09 07:00 | 122306 | | |
| 2026-05-09 06:00 | 134194 | | |
| 2026-05-09 05:00 | 136400 | | |
| 2026-05-09 04:00 | 133456 | | |
| 2026-05-09 03:00 | 128200 | | |
| 2026-05-09 02:00 | 123487 | | |
| 2026-05-09 01:00 | 123037 | | |
| 2026-05-09 00:00 | 126362 | | |
| 2026-05-08 23:00 | 130006 | | |
| 2026-05-08 22:00 | 132250 | | |
| 2026-05-08 21:00 | 134169 | | |
| 2026-05-08 20:00 | 132963 | | |
| 2026-05-08 19:00 | 120881 | | |
| 2026-05-08 18:00 | 99037 | | |
| 2026-05-08 17:00 | 79775 | | |
| 2026-05-08 16:00 | 70844 | | |
| 2026-05-08 15:00 | 71031 | | |
| 2026-05-08 14:00 | 77375 | | |
| 2026-05-08 13:00 | 85494 | | |
| 2026-05-08 12:00 | 90412 | | |
| 2026-05-08 11:00 | 92106 | | |
| 2026-05-08 10:00 | 94950 | | |
| 2026-05-08 09:00 | 101731 | | |
| 2026-05-08 08:00 | 109719 | | |
| 2026-05-08 07:00 | 114513 | | |
| 2026-05-08 06:00 | 115425 | | |
| 2026-05-08 05:00 | 114000 | | |
| 2026-05-08 04:00 | 112544 | | |
| 2026-05-08 03:00 | 113362 | | |
| 2026-05-08 02:00 | 116088 | | |
| 2026-05-08 01:00 | 118744 | | |
| 2026-05-08 00:00 | 123419 | | |
| 2026-05-07 23:00 | 134044 | | |
| 2026-05-07 22:00 | 147106 | | |
| 2026-05-07 21:00 | 154088 | | |
| 2026-05-07 20:00 | 149631 | | |
| 2026-05-07 19:00 | 134438 | | |
| 2026-05-07 18:00 | 115875 | | |
| 2026-05-07 17:00 | 101919 | | |
| 2026-05-07 16:00 | 94562 | | |
| 2026-05-07 15:00 | 92263 | | |
| 2026-05-07 14:00 | 91513 | | |
| 2026-05-07 13:00 | 87612 | | |
| 2026-05-07 12:00 | 81106 | | |
| 2026-05-07 11:00 | 76750 | | |
| 2026-05-07 10:00 | 76469 | | |
| 2026-05-07 09:00 | 80225 | | |
| 2026-05-07 08:00 | 86500 | | |
| 2026-05-07 07:00 | 89138 | | |
| 2026-05-07 06:00 | 82675 | | |
| 2026-05-07 05:00 | 70912 | | |
| 2026-05-07 04:00 | 62237 | | |
| 2026-05-07 03:00 | 60788 | | |
| 2026-05-07 02:00 | 67106 | | |
| 2026-05-07 01:00 | 79494 | | |
| 2026-05-07 00:00 | 94525 | | |
| 2026-05-06 23:00 | 108581 | | |
| 2026-05-06 22:00 | 118606 | | |
| 2026-05-06 21:00 | 124537 | | |
| 2026-05-06 20:00 | 126369 | | |
| 2026-05-06 19:00 | 118688 | | |
| 2026-05-06 18:00 | 99431 | | |
| 2026-05-06 17:00 | 79006 | | |