COLUMBIA--GRAND COULEE DAM (GCDW1)
| Observed | Forecast/Trend Issued: 2026-01-27 08:41 PST | ||
| Date/Time (PST) | Inflow | Date/Time (PST) | Inflow |
| 2026-01-28 00:00 | 121100 | 2026-01-28 10:00 | 119117.83 |
| 2026-01-27 00:00 | 119100 | 2026-01-28 16:00 | 117916.5 |
| 2026-01-26 00:00 | 130800 | 2026-01-28 22:00 | 116748.64 |
| 2026-01-25 00:00 | 126600 | 2026-01-29 04:00 | 115588.07 |
| 2026-01-24 00:00 | 127600 | 2026-01-29 10:00 | 114480.45 |
| 2026-01-23 00:00 | 124000 | 2026-01-29 16:00 | 113480.61 |
| 2026-01-22 00:00 | 135400 | 2026-01-29 22:00 | 112528.99 |
| 2026-01-21 00:00 | 132900 | 2026-01-30 04:00 | 111621.79 |
| 2026-01-20 00:00 | 130000 | 2026-01-30 10:00 | 110786.33 |
| 2026-01-19 00:00 | 131300 | 2026-01-30 16:00 | 110044.29 |
| 2026-01-18 00:00 | 131400 | 2026-01-30 22:00 | 109391.39 |
| 2026-01-31 04:00 | 108796.19 | ||
| 2026-01-31 10:00 | 108208.41 | ||
| 2026-01-31 16:00 | 107571.11 | ||
| 2026-01-31 22:00 | 106860.75 | ||
| 2026-02-01 04:00 | 106085.65 | ||
| 2026-02-01 10:00 | 105325.94 | ||
| 2026-02-01 16:00 | 104764.07 | ||
| 2026-02-01 22:00 | 104494.37 | ||
| 2026-02-02 04:00 | 104425.63 | ||
| 2026-02-02 10:00 | 104408.03 | ||
| 2026-02-02 16:00 | 104372.99 | ||
| 2026-02-02 22:00 | 104355.71 | ||
| 2026-02-03 04:00 | 104342.64 | ||
| 2026-02-03 10:00 | 104328.12 | ||
| 2026-02-03 16:00 | 104309.75 | ||
| 2026-02-03 22:00 | 104288.43 | ||
| 2026-02-04 04:00 | 104262.44 | ||
| 2026-02-04 10:00 | 104237.63 | ||
| 2026-02-04 16:00 | 104213.11 | ||
| 2026-02-04 22:00 | 104185.24 | ||
| 2026-02-05 04:00 | 104148.05 | ||
| 2026-02-05 10:00 | 104108.27 | ||
| 2026-02-05 16:00 | 104068.82 | ||
| 2026-02-05 22:00 | 104029.6 | ||
| 2026-02-06 04:00 | 103987.33 | ||