Peakflow Forecasts Header

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 2025
Ensemble Date: 2025-07-14
 Forecast Period: July 14 to November 1
Exceedence
Probability 		Stage
feet 		Discharge
CFS 		Probable
Date of Peak
95 % 13.96 104354 2025-07-16
90 % 13.96 104354 2025-07-16
70 % 13.96 104354 2025-07-16
50 % 13.96 104354 2025-07-16
30 % 13.96 104354 2025-07-16
10 % 14.27 107739 2025-08-14
05 % 14.83 114258 2025-10-29

Peakflow exceedence plot for PRDW1

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