Rivers in Washington
Chehalis River at Porter
Below flood stage
30.53ftStage
Observed Wed, Sep 23, 12:45 PM PDT
- Flood stage
- 48.00 ft
- Forecast crest
- 30.75 ftSat, Sep 26, 5:00 PM PDT
- Record crest
- 53.17 ft2007
Flood stages and impacts
| Category | Stage |
|---|---|
| Major flood | 52.00 ft |
| Moderate flood | 50.00 ft |
| Minor flood | 48.00 ft |
| Action | 45.50 ft |
- 52.00 ftthe 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.
- 50.00 ftfeet...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.
- 49.00 ftthe 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.
- 48.00 ftthe 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.
- 46.00 ftthe Chehalis River in Grays Harbor County will locally spill over its banks with shallow water on several roads.
Flood outlook
Chance of flooding, September to November
| Category | Chance |
|---|---|
| Minor flooding | 15% |
| Moderate flooding | Under 5% |
| Major flooding | Under 5% |
The three-month chances are the River Forecast Centers’ long-range flood outlook, issued September 23, 2026.
Crest history
177 crests on NOAA’s list since 1946.
| # | Date | Stage |
|---|---|---|
| 1 | December 5, 2007 | 53.17 ft |
| 2 | January 8, 2022 | 52.01 ft |
| 3 | December 12, 2025 | 49.64 ft |
| 4 | January 15, 2021 | 49.18 ft |
| 5 | January 9, 2020 | 48.99 ft |
| 6 | March 3, 2022 | 48.79 ft |
| 7 | December 23, 2019 | 48.58 ft |
| 8 | December 8, 2023 | 48.54 ft |
| 9 | January 13, 2022 | 48.36 ft |
| 10 | November 14, 2021 | 48.15 ft |
| 11 | December 21, 2025 | 48.14 ft |
| 12 | February 24, 2021 | 47.65 ft |
| 13 | December 5, 2007 | 26.06 ft |
| 14 | February 9, 1996 | 25.22 ft |
| 15 | January 9, 2009 | 24.65 ft |
| 16 | January 11, 1990 | 24.52 ft |
| 17 | January 22, 1972 | 23.88 ft |
| 18 | January 27, 1971 | 23.50 ft |
| 19 | January 2, 1997 | 23.43 ft |
| 20 | December 5, 1975 | 23.36 ft |
| 21 | November 25, 1986 | 23.36 ft |
| 22 | November 26, 1990 | 23.17 ft |
| 23 | February 12, 1990 | 22.87 ft |
| 24 | April 6, 1991 | 22.84 ft |
| 25 | December 11, 2015 | 22.73 ft |
Most recent crests
- December 21, 2025: 48.14 ft
- December 12, 2025: 49.64 ft
- December 8, 2023: 48.54 ft
- March 3, 2022: 48.79 ft
- January 13, 2022: 48.36 ft
- January 8, 2022: 52.01 ft
- November 14, 2021: 48.15 ft
- February 24, 2021: 47.65 ft
- January 15, 2021: 49.18 ft
- January 9, 2020: 48.99 ft
Nearby
Upstream, downstream and the gauges around this one.
What this means
Forecasts by the Northwest River Forecast Center. Forecasts are issued routinely year-round. 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.
Sources
Stage, flood stages, impacts and crest history from NOAA’s National Water Prediction Service. Streamflow and the daily record from the U.S. Geological Survey.