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
2027
Ensemble Date: 2026-10-09
Forecast Period: October 9 to February 1
Exceedence
Probability
Stage
feet
Discharge
CFS
Probable
Date of Peak
95 % 4.12 260 2026-11-23
90 % 4.39 355 2026-11-30
70 % 4.62 466 2026-12-20
50 % 4.96 654 2027-01-01
30 % 5.08 718 2027-01-14
10 % 5.69 1030 2027-01-29
05 % 6.24 1296 2027-01-31

Peakflow exceedence plot for MYKO3

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