MILL CREEK − AT ORILLIA (MCOW1)
   State:  Washington
   County:  King
   Latitude:  47 26' 19" North
   Longitude:  122 14' 19" West
   Elevation:  20 ft

   Supporting NWS Forecast Office: WFO Seattle

   
Click for NWS Official River Forecasts for MCOW1
   

Daily Historical Statistics for April 05, 2026
Mean Stage: 16.53 ft  Mean Flow: 14 cfs
Max Stage: 18.57 ft  Max Flow: 51 cfs (2011)
Min Stage:  15.52 ft   Min Flow: 3 cfs (2021)

Statistics based on water years: 1994-2024
* statistics estimated based on current rating

The 4-10 Day Trend Forecast is based on model guidance and uncertainty during this period is greater.

Hydrograph plot for MCOW1

Data Used In Plot   "label   USGS Observations