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This probabilistic forecast is issued by the Northwest River Forecast Center.

	Hydrograph			River at a Glance			Download			Probability Information Weekly Chance of Exceeding Levels Not Available Chance of Exceeding Levels During Entire Period Not Available Short-term Probabilistic Guidance (Experimental)

For official forecast click here

Experimental Short Range Forecast Uncertainty (AHPS) - External Links: Product Description Document | Customer Survey

About this graph

Forecasts for the Willamette River at Corvallis are issued routinely year-round.

Return to Area Map

Upstream Gauge

Downstream Gauge

Zoom Level:15

Flood Categories (in feet)

Major Flood Stage:	36
Moderate Flood Stage:	33
Flood Stage:	30
Action Stage:	26
Low Stage (in feet):	-9999

Historic Crests
(1) 42.40 ft on 12/01/1861
(2) 38.20 ft on 12/29/1945
(3) 38.10 ft on 01/02/1943
(4) 36.80 ft on 01/08/1948
(5) 36.20 ft on 01/19/1953
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 32.84 ft on 04/10/2019
(2) 27.37 ft on 02/17/2014
(3) 28.90 ft on 01/20/2012
(4) 25.20 ft on 06/06/2010
(5) 30.65 ft on 01/19/2006
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
(1) -0.30 ft on 06/25/1977
(2) -0.20 ft on 11/30/1952
(3) 0.00 ft on 07/13/1980
Show More Low Water Records

	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

If you notice any errors in the below information, please contact our Webmaster
36	expect widespread flooding, with serious flooding possible between Corvallis and Albany on the west bank of the river. At this and higher stages, the Willamette River between Harrisburg and Corvallis has historically been up to 3 miles wide.
32	expect flooding of low spots of Hwy 99 south of Corvallis, the Corvallis-Albany Hwy, and Hwy 34 near Corvallis.
30	expect extensive flooding of low-lying agricultural land east and south of Corvallis. Flooding of low areas of Hwy 34 and numerous roads in and near Corvallis begins.
28	expect flooding of some river island access roads and secondary roads east of Corvallis.
26	the river is at bankfull level and may spill out of its banks at some locations between Harrisburg and Albany.
Photos (1) USGS gage house (2) Upstream view (3) View downstream

Other Real-time and/or Archive Data Sources:

U.S. Geological Survey (USGS) Data and Site Info for Corvallis

Additional Information

Datum was changed by 10 FEET in 2010. All related data (flood levels, impacts, historical crests) were updated to reflect datum change.
10-day Forecast/Trend, Northwest River Forecast Center

Collaborative Agencies

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

National Weather Service
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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