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This probabilistic forecast is issued by the Northwest River Forecast Center.
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About this graph
Forecasts for the Tualatin River at Farmington are issued routinely year-round.
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Zoom Level:14
Flood Categories (in feet)
Major Flood Stage: 36
Moderate Flood Stage: 34
Flood Stage: 32
Action Stage: 28
Low Stage (in feet): -9999

Historic Crests
(1) 37.20 ft on 02/09/1996
(2) 37.00 ft on 12/22/1933
(3) 36.03 ft on 12/22/1955
(4) 35.13 ft on 01/17/1974
(5) 34.81 ft on 01/01/1997
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(P): Preliminary values subject to further review.

Recent Crests
(1) 32.80 ft on 12/19/2015
(2) 34.02 ft on 12/11/2015
(3) 32.60 ft on 12/06/2007
(4) 33.63 ft on 01/12/2006
(5) 32.86 ft on 01/01/2006
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
(1) 1.67 ft on 08/13/1958
(2) 2.16 ft on 08/26/1951
(3) 2.36 ft on 07/29/1957
Show More Low Water Records
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Gauge LocationGauge Map Marker
Latitude/Longitude Disclaimer: The gauge location shown in the above map is the approximate location based on the latitude/longitude coordinates provided to the NWS by the gauge owner.
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37 expect widespread flooding of homes and roads in and around Farmington, Tualatin, and West Linn. Historically, numerous homes in Tualatin along and near the river have flooded at this level. The Oswego Canal inlet gate will likely be overtopped.
36 expect major flooding of numerous homes and roads from Farmington downstream to Tualatin. Historically, evacuations in several areas including Farmington, Tualatin, and Rivergrove have taken place when the river reached this stage. The Oswego Canal inlet gate is in danger of being overtopped.
35 expect widespread flooding of lowland areas. Flooding of numerous residential areas in and around Farmington, Tualatin, and Rivergrove just east of I-5 begins at this level. Also expect flooding of numerous roads and subsequent road closures in these areas.
34 expect inundation of large areas along the Tualatin from Farmington downstream to the City of Tualatin. The main flood impact is to low-lying pastures and farmland along the river, but lower elevations of some secondary roads between Farmington and Tualatin may be flooded, and some structures in the city of Tualatin may be threatened by flood water.
32 expect flooding of numerous fields and low-lying farms, along with flooding of a few secondary roads in and around Farmington and Tualatin. Some farmland near the river channel will be inundated.
28 the river is at bankfull level. Above this level, some inundation of low areas and farmland along the river channel will occur.
(1) OWRD gage equipment
(2) Downstream view from Farmington Bridge
(3) Upstream view from Farmington Bridge
(4) Bridge-mounted stream gauge

Other Real-time and/or Archive Data Sources:

Additional Information Collapse
Archived/Historical Data Oregon Water Resources Dept
10-day Forecast/Trend, Northwest River Forecast Center
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The National Weather Service prepares its forecasts and other services in collaboration with agencies like the US Geological Survey, US Bureau of Reclamation, US Army Corps of Engineers, Natural Resource Conservation Service, National Park Service, ALERT Users Group, Bureau of Indian Affairs, and many state and local emergency managers across the country. For details, please click here.
NWS Information
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Portland Weather Forecast Office
5241 NE 122nd Avenue
Portland, OR 97230-1089
(503) 261-9246
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Page last modified: 2-Nov-2020 7:27 PM
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