COLUMBIA--GRAND COULEE DAM (GCDW1)
| Observed | Forecast/Trend Issued: 2026-08-07 09:45 PDT | ||
| Date/Time (PDT) | Inflow | Date/Time (PDT) | Inflow |
| 2026-08-08 00:00 | 86500 | 2026-08-08 05:00 | 86508.99 |
| 2026-08-07 00:00 | 86900 | 2026-08-08 11:00 | 87077.25 |
| 2026-08-06 00:00 | 90800 | 2026-08-08 17:00 | 87565.31 |
| 2026-08-05 00:00 | 85600 | 2026-08-08 23:00 | 87913.65 |
| 2026-08-04 00:00 | 89700 | 2026-08-09 05:00 | 88142.88 |
| 2026-08-03 00:00 | 88800 | 2026-08-09 11:00 | 88282.51 |
| 2026-08-02 00:00 | 84100 | 2026-08-09 17:00 | 88362.93 |
| 2026-08-01 00:00 | 99000 | 2026-08-09 23:00 | 88400.85 |
| 2026-07-31 00:00 | 89300 | 2026-08-10 05:00 | 88381.84 |
| 2026-07-30 00:00 | 92800 | 2026-08-10 11:00 | 88245.33 |
| 2026-07-29 00:00 | 84600 | 2026-08-10 17:00 | 87954.15 |
| 2026-08-10 23:00 | 87555.69 | ||
| 2026-08-11 05:00 | 87159.93 | ||
| 2026-08-11 11:00 | 86844 | ||
| 2026-08-11 17:00 | 86628.35 | ||
| 2026-08-11 23:00 | 86494.77 | ||
| 2026-08-12 05:00 | 86421.92 | ||
| 2026-08-12 11:00 | 86385.11 | ||
| 2026-08-12 17:00 | 86367.67 | ||
| 2026-08-12 23:00 | 86358.21 | ||
| 2026-08-13 05:00 | 86355.61 | ||
| 2026-08-13 11:00 | 86353.42 | ||
| 2026-08-13 17:00 | 86346.98 | ||
| 2026-08-13 23:00 | 86332.73 | ||
| 2026-08-14 05:00 | 86214.88 | ||
| 2026-08-14 11:00 | 85810.19 | ||
| 2026-08-14 17:00 | 85295.81 | ||
| 2026-08-14 23:00 | 85127.54 | ||
| 2026-08-15 05:00 | 85320.21 | ||
| 2026-08-15 11:00 | 85476.63 | ||
| 2026-08-15 17:00 | 85429.77 | ||
| 2026-08-15 23:00 | 85318.96 | ||
| 2026-08-16 05:00 | 85259.64 | ||
| 2026-08-16 11:00 | 85233.76 | ||
| 2026-08-16 17:00 | 85216.61 | ||
| 2026-08-16 23:00 | 85204.03 | ||
| 2026-08-17 05:00 | 85191.51 | ||