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
2027
Ensemble Date: 2026-10-10
Forecast Period: October 10 to February 1
Exceedence
Probability
Stage
feet
Discharge
CFS
Probable
Date of Peak
95 % 3.32 344 2026-10-12
90 % 3.32 344 2026-10-12
70 % 3.34 355 2026-10-28
50 % 3.42 399 2026-11-05
30 % 3.52 466 2026-11-23
10 % 3.99 822 2026-12-23
05 % 4.30 1128 2026-12-31

Peakflow exceedence plot for PRLI1

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