WILLAMETTE − AT PORTLAND (PRTO3)
   State:  Oregon
   County:  Multnomah
   Latitude:  45 31' 5" North
   Longitude:  122 40' 15" West
   Elevation:  2 ft

   Supporting NWS Forecast Office: WFO Portland
   Click for NWS Official River Forecasts for PRTO3
   

   Action Stage:  17 ft
   Flood Stage:  18 ft
   Moderate Flood Stage:  24 ft
   Major Flood Stage:  28 ft
Daily Historical Statistics for July 27, 2026
Mean Flow: 8780 cfs
Max Flow: 16000 cfs (1993)
Min Flow: 4800 cfs (1978)

Statistics based on water years: 1973-2024
* statistics estimated based on current rating

Record Stage: 33 ft
Date of Record: June 7, 1894

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

Hydrograph plot for PRTO3

Data Used In Plot   "label   United States Geological Survey   


Hydrograph plot for PRTO3

Data Used In Plot   "label   United States Geological Survey   


Hydrograph plot for PRTO3

Data Used In Plot   "label   United States Geological Survey