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| COWLITZ--MOSSYROCK RESERVOIR | |
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| Forecasts are calculated from a forecast time series that approximates flow at a 6 hour time step interval. Observed instantaneous peaks can be higher than model forecast peaks. |
| COWLITZ--MOSSYROCK RESERVOIR (MSRW1) Forecasts for Water Year 2026 Ensemble Date: 2026-08-18 Forecast Period: August 18 to December 1 | |||
| Exceedence Probability | Inflow CFS | Probable Date of Peak | |
| 95 % | 1783 | 2026-10-22 | |
| 90 % | 4523 | 2026-10-31 | |
| 70 % | 8627 | 2026-11-11 | |
| 50 % | 12440 | 2026-11-18 | |
| 30 % | 22233 | 2026-11-23 | |
| 10 % | 37370 | 2026-11-27 | |
| 05 % | 52798 | 2026-11-29 | |
