Marys River near Philomath
Oregon — Water Level & Flood Stage
Located in Benton County, Oregon on the Marys River. Live water level data from USGS gauge 14171000, updated every 15 minutes.
Current Water Level
Gage Height
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Streamflow
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Last Reading
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Flood Stages
Major Flood
21.5 ft
10,300 cfs
Moderate Flood
21 ft
6,000 cfs
Minor Flood
20 ft
4,300 cfs
Action Stage
16 ft
2,230 cfs
Flood stages defined by the National Weather Service. Gage height data from USGS Water Resources.
What Floods at Each Level
21.8 ft
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 ft
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 ft
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 ft
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 ft
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 ft
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 ft
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 ft
expect widespread low land and agricultural flooding. Numerous roads along the Marys are affected, and some structures near the river may begin to flood.
Impact statements from the National Weather Service, describing what typically happens at each water level.
7-Day Water Level Chart
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Historic Crests
| Date | Stage | Flow |
|---|---|---|
| Jan 19, 2012 | 21.53 ft | 11,700 cfs |
| Jan 19, 2012 | 21.53 ft | 11,700 cfs |
| Nov 25, 2016 | 21.21 ft | 6,070 cfs |
| Nov 25, 2016 | 21.21 ft | 6,070 cfs |
| Dec 17, 2015 | 21.1 ft | 7,890 cfs |
About This Gauge
Get Flood Alerts for Marys River
StormCast monitors this gauge and sends a push notification to your phone when the water level crosses into a new flood category — even at 3 AM.
Frequently Asked Questions
What is the current water level of Marys River near Philomath?
The Marys River near Philomath gauge is maintained by USGS (site 14171000) and reports water levels every 15 minutes. Visit this page to see the latest reading updated live, or download StormCast to get push alerts when levels rise.
What is flood stage for Marys River near Philomath?
The NWS-defined flood stage for Marys River near Philomath is 20 feet. Action stage begins at 16 feet. Moderate flooding starts at 21 feet, and major flooding at 21.5 feet.
How do I get alerts when Marys River rises?
Download StormCast free on Google Play, go to River Gauges, and add Marys River near Philomath to your watchlist. StormCast will send a push notification to your phone whenever the water level crosses into a new NWS flood category — even when your screen is off.
Where is the Marys River near Philomath gauge located?
The gauge is located in Benton County, Oregon at coordinates 44.5250°N, 123.3347°W. USGS site number: 14171000. Data is provided by the U.S. Geological Survey and the National Weather Service.
On This River
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Source & Notes
Data provided by: US Geological Survey, Observations courtesy of U.S. Geological Survey