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Experimental National Water Center Products: The National Hydrologic Discussion, Area Hydrologic Discussion, and Flood Hazard Outlook, and real-time geospatial services depicting River Forecast Center and National Water Model forecasts, continue to be accessible via https://www.weather.gov/owp/operations, as described in the StoryMap here.

Weather Forecast Office Portland, OR

Northwest River Forecast Center

Hydrograph

River at a Glance

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Probability Information Weekly Chance of Exceeding Levels Not Available Chance of Exceeding Levels During Entire Period Not Available Short-term Probabilistic Guidance (Experimental)

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Printable Image About this graph Tabular Data (UTC) Tabular Data (PDT) Datum: NAVD88 Metadata

NOTE: Forecasts for the Tualatin River at Farmington are issued routinely year-round.

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Upstream Gauge

Downstream Gauge

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 Show More Historic Crests (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 For more information on your flood risk go to www.floodsmart.gov. Show FEMA's National Flood Hazard Layers FEMA's National Flood Hazard Layers not showing? Why aren't the FEMA National Flood Hazard Layers showing on the ESRI Map? Possible reasons: There are no FEMA National Flood Hazard Layers for the location which you are viewing on ESRI Maps. The FEMA Web Mapping Service (WMS) is down. Note: Your zoom level may have changed. ESRI's zoom levels must be between 14 and 16 to show National Flood Hazard layers.

Zoom Level:14 Legend FEMA Layer Gauge Location Disclaimer 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.

Flood Impacts & Photos

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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.
Photos (1) OWRD gage equipment (2) Downstream view from Farmington Bridge (3) Upstream view from Farmington Bridge (4) Bridge-mounted stream gauge

About This Location

Latitude: 45.449444° N, Longitude: 122.950278° W, Horizontal Datum: NAD83/WGS84 River Stage Reference Frame Gauge Height Flood Stage Uses NWS stage 0 ft 32 ft Interpreting hydrographs and NWS watch, warnings, and forecasts, and inundation maps Vertical Datum Elevation (gauge height = 0) Elevation (gauge height = flood stage) Elevation information source NAVD88 120 152 Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps NGVD 29 Not Available Not Available Older USGS topographic maps, NGVD29 benchmarks MSL Not Available Not Available Older USGS topographic maps, MSL benchmarks Other Not Available Not Available   Current/Historical Observations: U.S. Geological Survey (USGS) Data and Site Info for Farmington

Additional Information

Archived/Historical Data Oregon Water Resources Dept 10-day Forecast/Trend, Northwest River Forecast Center

Resources

Hydrologic Resources Text Products Past Precipitation Forecast Precipitation River Forecast Centers River Stage Summary Text Table Temp & Precip Forecasts 3-Day Detailed Precip Forecast 10-Day Temp & Precip Outlook Lewis Dams - USGS data (scroll down to Lewis basin) Lower Columbia Reservoir and River conditions USACE DataQuery USGS WaterWatch Oregon USGS WaterWatch Washington USGS River Temperatures & Water Quality Oregon USGS River Temperatures & Water Quality Washington Oregon Water Resources Dept - Surface Water Data USGS Oregon river levels USGS Washington river levels

Additional Resources Area Hydrographs NWS Precipitation and River Forecasting AHPS Iframes for Developers Mobile iNWS for emergency management Snow Data NRCS SNOTEL data map interface USACE Portland District Reservoirs USBR PacNW Reservoirs Oregon Drought Information National Drought Information

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