Major Flood
52 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
50 ft
Minor Flood
48 ft
Action Stage
45.5 ft
What Floods at Each Level
52 ft
the Chehalis River in Grays Harbor will cause major near record flooding from Oakville downstream to Grays Harbor. Deep and swift flood waters will inundate numerous farms and roads...including SR 12. High tidal levels at Aberdeen will worsen flooding along the lower reaches. Flooding will occur all along the river including headwaters...tributaries...and other streams within and near the Chehalis River Basin.
50 ft
feet...the Chehalis River in Grays Harbor will flood numerous farms and roads including SR 12. High tidal levels at Aberdeen will worsen flooding along the lower reaches.
49 ft
the Chehalis River in Grays Harbor will flood pasture lands and many roads...including SR 12 between Oakville and Rochester. High tidal levels at Aberdeen will worsen flooding along the lower reaches.
48 ft
the Chehalis River in Grays Harbor will flood low pasture lands and some roads. High tidal levels at Aberdeen will worsen flooding along the lower reaches.
46 ft
the Chehalis River in Grays Harbor County will locally spill over its banks with shallow water on several roads.
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 |
|---|---|---|
| Dec 4, 2007 | 53.17 ft | 10,200 cfs |
| Jan 8, 2022 | 52.01 ft | 61,896 cfs |
| Dec 12, 2025 | 49.64 ft | 33,994 cfs |
About This Gauge
USGS Site
NWS LID
CRPW1
River
Chehalis River
County
Grays Harbor, WA
Coordinates
46.9393°N, 123.3143°W
Get Flood Alerts for Chehalis 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 Chehalis River at Porter?
The Chehalis River at Porter gauge is maintained by USGS (site 12031000) 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 Chehalis River at Porter?
The NWS-defined flood stage for Chehalis River at Porter is 48 feet. Action stage begins at 45.5 feet. Moderate flooding starts at 50 feet, and major flooding at 52 feet.
How do I get alerts when Chehalis River rises?
Download StormCast free on Google Play, go to River Gauges, and add Chehalis River at Porter 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 Chehalis River at Porter gauge located?
The gauge is located in Grays Harbor County, Washington at coordinates 46.9393°N, 123.3143°W. USGS site number: 12031000. Data is provided by the U.S. Geological Survey and the National Weather Service.
More Gauges on Chehalis River
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Source & Notes
Data provided by: US Geological Survey, Observations courtesy of U.S. Geological Survey
- River forecasts for this location take into account past and future precipitation. The stages/flows that will occur may be different if future rainfall is different than forecast.