SOUTH SANTIAM − AT WATERLOO (WTLO3)
   State:  Oregon
   County:  Linn
   Latitude:  44 29' 54" North
   Longitude:  122 49' 19" West
   Elevation:  370 ft

   Supporting NWS Forecast Office: WFO Portland

   
Click for NWS Official River Forecasts for WTLO3
   


   Action Stage:  
10.2 ft
   Flood Stage:  
12 ft
   Moderate Flood Stage:  
14 ft
   Major Flood Stage:  
16 ft
Daily Historical Statistics for May 13, 2026
Mean Stage: 4.35 ft  Mean Flow: 2890 cfs
Max Stage: 6.82 ft  Max Flow: 8360 cfs (1960)
Min Stage:  2.78 ft   Min Flow: 770 cfs (1973)

Statistics based on water years: 1906-2024
* statistics estimated based on current rating

Record Stage: 
24.5 ft
Record Flow: 
95200 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 WTLO3

Data Used In Plot   "label   USACE Observations   USACE Map   


Hydrograph plot for WTLO3

Data Used In Plot   "label   USACE Observations   USACE Map