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COLUMBIA--BLO PRIEST RAPIDS DAM
   State:  Washington    County:  GRANT
   Latitude:  46 37' 59" North    Longitude:  119 52' 0" West
   Elevation:  388 feet
   Supporting WFO:  Spokane    
   Action Stage:  31'   Flood Stage:  32'   Moderate Flood Stage:  33'
   Major Flood Stage:  34'

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.

COLUMBIA--BLO PRIEST RAPIDS DAM   (PRDW1)
Forecasts for Water Year 2026
Ensemble Date: 2026-06-06
 Forecast Period: June 6 to October 1
Exceedence
Probability 		Stage
feet 		Discharge
CFS 		Probable
Date of Peak
95 % 20.31 183715 2026-06-07
90 % 20.31 183715 2026-06-07
70 % 20.31 183715 2026-06-07
50 % 20.31 183715 2026-06-07
30 % 20.31 183715 2026-06-07
10 % 20.61 187948 2026-06-23
05 % 21.56 201660 2026-06-24

Peakflow exceedence plot for PRDW1

 Click to download runoff traces used in forecast.  Click for comma delimited data used in plot.csv icon