Major Flood
15 ft
Current Water Level
Gage Height
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Streamflow
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Last Reading
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FLOOD STAGES
Know the flood categories.
Flood stages defined by the National Weather Service. Gage height data from USGS Water Resources.
Moderate Flood
14.5 ft
Minor Flood
13.5 ft
Action Stage
11 ft
What Floods at Each Level
18 ft
expect major widespread flooding of homes and structures from the City of Tualatin downstream to the confluence with the Willamette, along with numerous road closures. Also expect major flooding of homes and boat houses around Lake Oswego and along the Oswego Canal.
17 ft
expect flooding of numerous homes and structures along the Tualatin River upstream of the City of Tualatin down to the confluence with the Willamette, including flooding of homes in the Rivergrove area just east of I-5. Also expect overtopping of the Oswego Canal inlet gate and flooding along the Oswego Canal. The Oswego lake surface will begin rising even with all lake outlets fully opened.
16 ft
expect flooding of numerous homes and structures along the Tualatin River upstream of the City of Tualatin down to the confluence with the Willamette, along with flooding of homes in the Rivergrove area just east of I-5. Overtopping of the Oswego Canal inlet gate is possible at this level, which would lead to some erosion of the canal banks.
15 ft
expect flooding of homes and other structures to begin along the Tualatin River from upstream of the City of Tualatin down to the confluence with the Willamette. Also expect several road closures in the area.
14.5 ft
the Oswego canal inlet gate will likely be overtopped. Expect several road closures in the area. Flooding of homes and other structures along the Tualatin River from upstream of the City of Tualatin down to the confluence with the Willamette will also begin.
13.5 ft
expect lowland flooding. Numerous secondary roads upstream of Tualatin are likely to be closed, and low-lying structures along the Tualatin from the City of Tualatin downstream to the confluence with the Willamette are threatened by flood waters.
11 ft
some localized lowland flooding is possible.
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 |
|---|---|---|
| Feb 9, 1996 | 18.32 ft | 26,400 cfs |
| Dec 22, 1933 | 17.72 ft | 23,300 cfs |
| Dec 29, 1937 | 17.29 ft | 26,300 cfs |
About This Gauge
USGS Site
NWS LID
WSLO3
River
Tualatin River
County
Clackamas, OR
Coordinates
45.3508°N, 122.6750°W
Get Flood Alerts for Tualatin 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 Tualatin River at West Linn?
The Tualatin River at West Linn gauge is maintained by USGS (site 14207500) 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 Tualatin River at West Linn?
The NWS-defined flood stage for Tualatin River at West Linn is 13.5 feet. Action stage begins at 11 feet. Moderate flooding starts at 14.5 feet, and major flooding at 15 feet.
How do I get alerts when Tualatin River rises?
Download StormCast free on Google Play, go to River Gauges, and add Tualatin River at West Linn to your watchlist. StormCast will send a push notification to your phone whenever the water level crosses into a new NWS flood category.
Where is the Tualatin River at West Linn gauge located?
The gauge is located in Clackamas County, Oregon at coordinates 45.3508°N, 122.6750°W. USGS site number: 14207500. Data is provided by the U.S. Geological Survey and the National Weather Service.
More Gauges on Tualatin River
On This River
Upstream: Tualatin River at Tualatin
More Resources
Source & Notes
Data provided by: US Geological Survey, Observations courtesy of U.S. Geological Survey