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 20, 2026
Mean Flow: 9260 cfs
Max Flow: 18000 cfs (1983)
Min Flow: 5400 cfs (2019)

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   USGS Observations   


Hydrograph plot for PRTO3

Data Used In Plot   "label   USGS Observations   


Hydrograph plot for PRTO3

Data Used In Plot   "label   USGS Observations