LONG TOM − AT MONROE (MNRO3)
   State:  Oregon
   County:  Benton
   Latitude:  44 18' 47" North
   Longitude:  123 17' 43" West
   Elevation:  271 ft

   Supporting NWS Forecast Office: WFO Portland

   
Click for NWS Official River Forecasts for MNRO3
   


   Action Stage:  
8.5 ft
   Flood Stage:  
9 ft
   Moderate Flood Stage:  
11 ft
   Major Flood Stage:  
12 ft
Daily Historical Statistics for February 16, 2026
Mean Stage: 6.07 ft  Mean Flow: 1510 cfs
Max Stage: 8.94 ft  Max Flow: 6640 cfs (1961)
Min Stage:  4.15 ft   Min Flow: 20 cfs (1977)

Statistics based on water years: 1922-2025
* statistics estimated based on current rating

Record Stage: 
10.42 ft
Record Flow: 
19300 cfs
Date of Record: 
January 2, 1943

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

Hydrograph plot for MNRO3

Data Used In Plot   "label   ---


Hydrograph plot for MNRO3

Data Used In Plot   "label   ---