Peakflow Forecasts Header

LONG TOM--FERN RIDGE DAM
   State:  Oregon    County:  LANE
   Latitude:  44 7' 24" North    Longitude:  123 17' 54" West
   Elevation:  374 feet
   Supporting WFO:  Portland    
   Inflow Data  

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.

LONG TOM--FERN RIDGE DAM   (FRNO3)
Forecasts for Water Year
2025
Ensemble Date: 2025-05-15
Forecast Period: May 15 to September 1
Exceedence
Probability
Inflow
CFS
Probable
Date of Peak
95 % 198 2025-05-18
90 % 198 2025-05-18
70 % 198 2025-05-18
50 % 269 2025-05-29
30 % 429 2025-06-08
10 % 548 2025-06-28
05 % 696 2025-08-11

Peakflow exceedence plot for FRNO3

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