Peakflow Forecasts Header

SF PAYETTE--AT LOWMAN
   State:  Idaho    County:  BOISE
   Latitude:  44 5' 7" North    Longitude:  115 37' 15" West
   Elevation:  3790 feet
   Supporting WFO:  Boise    
   Action Stage:  7'   Flood Stage:  7.5'   Moderate Flood Stage:  8'
   Major Flood Stage:  9'

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.

SF PAYETTE--AT LOWMAN   (PRLI1)
Forecasts for Water Year 2026
Ensemble Date: 2026-02-06
 Forecast Period: February 6 to June 1
Exceedence
Probability 		Stage
feet 		Discharge
CFS 		Probable
Date of Peak
95 % 4.85 1894 2026-04-23
90 % 5.07 2212 2026-04-27
70 % 5.22 2438 2026-05-16
50 % 5.38 2696 2026-05-21
30 % 5.66 3156 2026-05-28
10 % 5.97 3714 2026-06-01
05 % 6.13 4022 2026-06-01

Peakflow exceedence plot for PRLI1

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