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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 Chehalis River at Porter are issued routinely year-round.
Return to Area Map

Zoom Level:16
Flood Categories (in feet)
Major Flood Stage: 52
Moderate Flood Stage: 50
Flood Stage: 48
Action Stage: 45.5
Low Stage (in feet): -9999

Historic Crests
(1) 53.17 ft on 12/05/2007
(2) 52.01 ft on 01/08/2022 (P)
(3) 49.18 ft on 01/15/2021 (P)
(4) 48.99 ft on 01/09/2020 (P)
(5) 48.79 ft on 03/03/2022 (P)
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 48.79 ft on 03/03/2022 (P)
(2) 48.36 ft on 01/13/2022 (P)
(3) 52.01 ft on 01/08/2022 (P)
(4) 48.15 ft on 11/14/2021 (P)
(5) 47.65 ft on 02/24/2021 (P)
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
(1) 2.20 ft on 10/17/1952
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
If you notice any errors in the below information, please contact our Webmaster
52 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 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 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 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 the Chehalis River in Grays Harbor County will locally spill over its banks with shallow water on several roads.

Other Real-time and/or Archive Data Sources:
Additional Information Collapse
Chehalis River Basin Flood Authority's Early Warning System:http://lewiscountywa.gov/chehalis-river-basin-flood-authority
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.
NWS Information
National Weather Service
Seattle Weather Forecast Office
7600 Sandpoint Way NE
Seattle, WA 98115-6349
(206) 526-6087
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