River Information and Forecasts Header
TUALATIN--NEAR DILLEY (DLLO3)
   State:  Oregon    County:  WASHINGTON
   Latitude:  45 28' 30" North    Longitude:  123 7' 23" West
   Elevation:  147 feet
   Supporting WFO:  Portland    NWS Official River Forecasts Click Here
   Action Stage:  16'   Flood Stage:  17.5'
   Major Flood Stage:  
19.5'

   Record Stage:  
19.34'  Record Flow:  17100 cfs
   Date of Record:  
December 22, 1964
Daily Historical Flow Statistics
for July 03

Mean Stage: 9.85 ft  Mean Flow: 105 cfs
Max Stage: 11.86 ft  Max Flow: 275 cfs (2015)
Min Stage:  8.22 ft   Min Flow: 11 cfs (1965)

Statistics based on water years: 1940-2020
The 4-10 Day Trend Forecast is based on model guidance only. Daily variation and uncertainty of forecasts during this period is high.

Hydrograph plot for DLLO3

For Data Used In Plot   "label


Hydrograph plot for DLLO3

For Data Used In Plot   "label