TUALATIN − NEAR DILLEY (DLLO3)
   State:  Oregon
   County:  Washington
   Latitude:  45 28' 30" North
   Longitude:  123 7' 23" West
   Elevation:  147 ft

   Supporting NWS Forecast Office: WFO Portland

   
Click for NWS Official River Forecasts for DLLO3
   


   Action Stage:  
16 ft
   Flood Stage:  
17.5 ft
   Moderate Flood Stage:  
18.5 ft
   Major Flood Stage:  
19.5 ft
Daily Historical Statistics for February 24, 2026
Mean Stage: 15.58 ft  Mean Flow: 717 cfs
Max Stage: 17.90 ft  Max Flow: 3630 cfs (1950)
Min Stage:  10.31 ft   Min Flow: 87 cfs (2005)

Statistics based on water years: 1940-2024
* statistics estimated based on current rating

Record Stage: 
19.34 ft
Record Flow: 
17100 cfs
Date of Record: 
December 22, 1964

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

Hydrograph plot for DLLO3

Data Used In Plot   "label   ---


Hydrograph plot for DLLO3

Data Used In Plot   "label   ---