Peakflow Forecasts Header

MCKAY CREEK--NEAR PILOT ROCK
   State:  Oregon    County:  UMATILLA
   Latitude:  45 32' 57" North    Longitude:  118 46' 23" West
   Elevation:  1343 feet
   Supporting WFO:  Pendleton    

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.

MCKAY CREEK--NEAR PILOT ROCK   (MYKO3)
Forecasts for Water Year
2026
Ensemble Date: 2026-05-14
Forecast Period: May 14 to September 1
Exceedence
Probability
Stage
feet
Discharge
CFS
Probable
Date of Peak
95 % 3.18 50 2026-06-05
90 % 3.19 51 2026-06-06
70 % 3.20 52 2026-06-08
50 % 3.21 54 2026-06-08
30 % 3.23 57 2026-06-08
10 % 3.56 113 2026-06-10
05 % 4.14 259 2026-06-12

Peakflow exceedence plot for MYKO3

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