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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: NGVD29 Metadata

NOTE: Forecasts for the Willamette River above Falls at Oregon City are issued routinely year-round.

Default Hydrograph Scale to Flood Categories   Return to Area Map

Upstream Gauge

Downstream Gauge

Flood Categories (in feet) Major Flood Stage: 67 Moderate Flood Stage: 0 Flood Stage: 64 Action Stage: 62 Low Stage (in feet): -9999 Historic Crests (1) 71.30 ft on 02/05/1990 (P) (2) 70.10 ft on 12/25/1964 (3) 69.47 ft on 02/09/1996 (4) 69.40 ft on 01/09/1923 (5) 68.50 ft on 01/03/1943 Show More Historic Crests (P): Preliminary values subject to further review. Recent Crests (1) 65.24 ft on 01/22/2012 (2) 62.01 ft on 11/28/1999 (3) 64.74 ft on 12/30/1998 (4) 66.43 ft on 01/02/1997 (5) 69.47 ft on 02/09/1996 Show More Recent Crests (P): Preliminary values subject to further review. Low Water Records (1) 0.00 ft on 08/13/1915 (2) 0.00 ft on 09/02/1934 (3) 0.10 ft on 10/31/1928 Show More Low Water Records

Zoom Level:16 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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69.5	expect flooding of the paper and power plants and areas on the Oregon City side of the river. Also expect considerable flooding of Southern Pacific Railroad, low parts of Hwy 99E, and other low areas upstream of the Oregon City locks.
65	expect flooding over side of upper locks. Water flow at this level begins to impact the paper plant and power plant.
64.7	expect water flowing over the top of lock gate #7.

About This Location

Latitude: 45.348056° N, Longitude: 122.620556° W, Horizontal Datum: NAD83/WGS84 River Stage Reference Frame Gauge Height Flood Stage Uses NWS stage 0 ft 64 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 Not Available Not Available Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps NGVD 29 0 ft 64 ft 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 Falls at Oregon City

Additional Information

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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