COLUMBIA--GRAND COULEE DAM (GCDW1)
| Observed | Forecast/Trend Issued: 2026-07-31 08:33 PDT | ||
| Date/Time (PDT) | Inflow | Date/Time (PDT) | Inflow |
| 2026-08-01 00:00 | 99000 | 2026-08-01 05:00 | 89143.14 |
| 2026-07-31 00:00 | 89300 | 2026-08-01 11:00 | 88925.87 |
| 2026-07-30 00:00 | 92800 | 2026-08-01 17:00 | 88867.42 |
| 2026-07-29 00:00 | 84600 | 2026-08-01 23:00 | 88797.89 |
| 2026-07-28 00:00 | 92400 | 2026-08-02 05:00 | 88699.05 |
| 2026-07-27 00:00 | 95300 | 2026-08-02 11:00 | 88718.84 |
| 2026-07-26 00:00 | 84000 | 2026-08-02 17:00 | 88848.4 |
| 2026-07-25 00:00 | 92000 | 2026-08-02 23:00 | 88953.7 |
| 2026-07-24 00:00 | 95400 | 2026-08-03 05:00 | 88985.76 |
| 2026-07-23 00:00 | 98000 | 2026-08-03 11:00 | 88988.34 |
| 2026-07-22 00:00 | 92900 | 2026-08-03 17:00 | 88992.93 |
| 2026-08-03 23:00 | 89001.59 | ||
| 2026-08-04 05:00 | 89009.57 | ||
| 2026-08-04 11:00 | 89015.07 | ||
| 2026-08-04 17:00 | 89022.13 | ||
| 2026-08-04 23:00 | 89028.5 | ||
| 2026-08-05 05:00 | 89016.46 | ||
| 2026-08-05 11:00 | 88957.57 | ||
| 2026-08-05 17:00 | 88837.91 | ||
| 2026-08-05 23:00 | 88675.45 | ||
| 2026-08-06 05:00 | 88510.93 | ||
| 2026-08-06 11:00 | 88378.8 | ||
| 2026-08-06 17:00 | 88292.53 | ||
| 2026-08-06 23:00 | 88244.09 | ||
| 2026-08-07 05:00 | 88218.11 | ||
| 2026-08-07 11:00 | 88202 | ||
| 2026-08-07 17:00 | 88192.38 | ||
| 2026-08-07 23:00 | 88185.47 | ||
| 2026-08-08 05:00 | 88177.79 | ||
| 2026-08-08 11:00 | 88168.72 | ||
| 2026-08-08 17:00 | 88162.09 | ||
| 2026-08-08 23:00 | 88157.94 | ||
| 2026-08-09 05:00 | 88152.47 | ||
| 2026-08-09 11:00 | 88144.2 | ||
| 2026-08-09 17:00 | 88138.58 | ||
| 2026-08-09 23:00 | 88136.76 | ||
| 2026-08-10 05:00 | 88105.57 | ||