COLUMBIA--GRAND COULEE DAM (GCDW1)
| Observed | Forecast/Trend Issued: 2026-08-30 08:37 PDT | ||
| Date/Time (PDT) | Inflow | Date/Time (PDT) | Inflow |
| 2026-08-30 00:00 | 75900 | 2026-08-30 23:00 | 76858.91 |
| 2026-08-29 00:00 | 80400 | 2026-08-31 05:00 | 76473.35 |
| 2026-08-28 00:00 | 77300 | 2026-08-31 11:00 | 76299.29 |
| 2026-08-27 00:00 | 77500 | 2026-08-31 17:00 | 76231.26 |
| 2026-08-26 00:00 | 80400 | 2026-08-31 23:00 | 76192.33 |
| 2026-08-25 00:00 | 81100 | 2026-09-01 05:00 | 76178.58 |
| 2026-08-24 00:00 | 80400 | 2026-09-01 11:00 | 76232.14 |
| 2026-08-23 00:00 | 78100 | 2026-09-01 17:00 | 76388.05 |
| 2026-08-22 00:00 | 81400 | 2026-09-01 23:00 | 76628.91 |
| 2026-08-21 00:00 | 86000 | 2026-09-02 05:00 | 76889.82 |
| 2026-08-20 00:00 | 83500 | 2026-09-02 11:00 | 77114.03 |
| 2026-09-02 17:00 | 77280.92 | ||
| 2026-09-02 23:00 | 77414.97 | ||
| 2026-09-03 05:00 | 77549.74 | ||
| 2026-09-03 11:00 | 77709.87 | ||
| 2026-09-03 17:00 | 77885.39 | ||
| 2026-09-03 23:00 | 78058.25 | ||
| 2026-09-04 05:00 | 78206.86 | ||
| 2026-09-04 11:00 | 78326.13 | ||
| 2026-09-04 17:00 | 78400.8 | ||
| 2026-09-04 23:00 | 78414.48 | ||
| 2026-09-05 05:00 | 78362.24 | ||
| 2026-09-05 11:00 | 78266.01 | ||
| 2026-09-05 17:00 | 78151.86 | ||
| 2026-09-05 23:00 | 78038.5 | ||
| 2026-09-06 05:00 | 77936.85 | ||
| 2026-09-06 11:00 | 77861.14 | ||
| 2026-09-06 17:00 | 77812.83 | ||
| 2026-09-06 23:00 | 77780.54 | ||
| 2026-09-07 05:00 | 77528.19 | ||
| 2026-09-07 11:00 | 76591.26 | ||
| 2026-09-07 17:00 | 75103.38 | ||
| 2026-09-07 23:00 | 73853.07 | ||
| 2026-09-08 05:00 | 73189.54 | ||
| 2026-09-08 11:00 | 72954.04 | ||
| 2026-09-08 17:00 | 72954.13 | ||
| 2026-09-08 23:00 | 73025.67 | ||
| 2026-09-09 05:00 | 73089.42 | ||