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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 Marys River near Philomath are issued routinely year-round.
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Downstream Gauge Downstream Gauge - at Corvallis
Zoom Level:14
Flood Categories (in feet)
Major Flood Stage: 21
Moderate Flood Stage: 0
Flood Stage: 20
Action Stage: 16
Low Stage (in feet): 0

Historic Crests
(1) 21.53 ft on 01/19/2012
(2) 21.21 ft on 11/25/2016
(3) 21.10 ft on 12/18/2015
(4) 21.07 ft on 12/30/2005
(5) 21.03 ft on 12/03/2007
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 21.02 ft on 01/03/2022 (P)
(2) 20.95 ft on 12/21/2021 (P)
(3) 21.21 ft on 11/25/2016
(4) 21.10 ft on 12/18/2015
(5) 20.53 ft on 12/22/2014
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
(1) 1.90 ft on 08/22/2015
KML Image
Gauge LocationGauge Map Marker
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 Collapse
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21.8 expect major and widespread flooding in Philomath and Corvallis and rural areas along the lower Marys River. Grange Hall Road, Fern Road, Chapel Drive, and Bellfountain Road will likely be impassable. The flow at this level is about 15,000 cfs and has a 2 percent chance of happening in a given year (aka 50-year flood).
21.4 expect major and widespread flooding in Philomath and Corvallis and rural areas along the lower Marys River. Grange Hall Road, Fern Road, Chapel Drive, and Bellfountain Road will likely be impassable. The flow at this level is about 10,900 cfs, which has a 10 percent chance of happening in a given year (aka 10-year flood).
21.25 expect major and widespread flooding in Philomath and Corvallis and rural areas along the lower Marys River. Grange Hall Road, Fern Road, Chapel Drive, and Bellfountain Road will likely be flooded. The flow at this level is about 9,000 cfs and has a 20 percent chance of happening in a given year (aka 5-year flood)
21 expect major and widespread flooding along the Marys River from Philomath to Corvallis, with numerous homes and farms affected. Several roads will likely be flooded, including Grange Hall Road, 13th Street / Fern Road, Chapel Drive, and Bellfountain Road.
20.8 expect widespread flooding in Philomath, especially on the south side in the vicinity of Chapel drive and Grange Hall Road, in central Benton County, and portions of Corvallis.
20.7 expect road flooding in Philomath, especially the south part of town in the vicinity of Chapel Drive, Fern Road, Grange Hall Road and Bellfountain Road. Portions of Highway 99W in Corvallis have historically been flooded at this level. If the Willamette River stage at Corvallis is at 28 ft or higher, expect additional flooding of county roads due to backing up of the Marys.
20.5 expect flooding of some homes in the southern part of Corvallis to begin, especially when the Willamette is also running high. In south Corvallis, a trailer park and light industrial areas begin to flood. Flooding may begin in the vicinity of Chapel Drive and Grange Hall Road on the south side of Philomath. Problems with the sewers have historically begun in Philomath at this and higher stages.
20 expect widespread low land and agricultural flooding. Numerous roads along the Marys are affected, and some structures near the river may begin to flood.
Photos
(1) USGS gage equipment
(2) Upstream view
(3) Downstream view

Other Real-time and/or Archive Data Sources:

Additional Information Collapse
Archived Data 1976-2001 at USACE DataQuery
Archived Data 2001-present at USACE DataQuery
10-day Forecast/Trend, Northwest River Forecast Center
Collaborative Agencies Collapse
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.
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Page last modified: 2-Nov-2020 7:27 PM
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