Rivers in Washington
Chehalis River near Grand Mound
Below flood stage
128.82ftStage
Observed Mon, Sep 21, 11:00 PM PDT
- Flood stage
- 141.00 ft
- Forecast crest
- 128.87 ftFri, Sep 25, 5:00 PM PDT
- Record crest
- 147.26 ft2007
Flood stages and impacts
| Category | Stage |
|---|---|
| Major flood | 144.00 ft |
| Moderate flood | 142.50 ft |
| Minor flood | 141.00 ft |
| Action | 138.50 ft |
- 146.00 ftthe Chehalis River in Thurston County will cause severe near record flooding, with deep and swift flood waters inundating the Independence Valley. Flooding will occur all along the river including headwaters, tributaries, and other streams within and near the Chehalis River Basin.
- 144.50 ftthe Chehalis River in Thurston County will cause major flooding, inundating roads and farm lands in Independence Valley. Deep and swift flood waters will cover SR-12 and James, Independence and Moon Roads. Flooding will occur all along the river including headwaters, tributaries, and other streams within and near the Chehalis River Basin.
- 142.50 ftthe Chehalis River in Thurston County will flood several roads in Independence Valley with swiftly moving water including SR-12 and James, Independence, Moon and Anderson Roads. Flood waters will cut off access to and from Chehalis Reservation and inundate nearby farm lands. Some residential structures may be threatened.
- 141.00 ftthe Chehalis River in Thurston County will flood several roads in Independence Valley including James Road, Independence Road, and Moon road. Flood waters will also cover nearby farm lands.
- 139.50 ftthe Chehalis River in Thurston County will locally spill out of its banks into nearby fields and over a few roads.
Flood outlook
Chance of flooding, September to November
| Category | Chance |
|---|---|
| Minor flooding | 18% |
| Moderate flooding | 13% |
| Major flooding | Under 5% |
The three-month chances are the River Forecast Centers’ long-range flood outlook, issued September 21, 2026.
Crest history
180 crests on NOAA’s list since 1931.
| # | Date | Stage |
|---|---|---|
| 1 | December 4, 2007 | 147.26 ft |
| 2 | January 7, 2022 | 145.21 ft |
| 3 | December 11, 2025 | 143.27 ft |
| 4 | January 14, 2021 | 142.88 ft |
| 5 | December 22, 2019 | 142.68 ft |
| 6 | March 2, 2022 | 142.59 ft |
| 7 | January 4, 2021 | 142.59 ft |
| 8 | January 8, 2020 | 142.41 ft |
| 9 | December 7, 2023 | 142.28 ft |
| 10 | November 13, 2021 | 141.41 ft |
| 11 | January 28, 2024 | 140.85 ft |
| 12 | December 4, 2007 | 20.23 ft |
| 13 | February 9, 1996 | 19.98 ft |
| 14 | January 10, 1990 | 19.34 ft |
| 15 | November 25, 1986 | 18.41 ft |
| 16 | December 29, 1937 | 18.39 ft |
| 17 | January 21, 1972 | 18.21 ft |
| 18 | January 8, 2009 | 18.18 ft |
| 19 | November 25, 1990 | 18.12 ft |
| 20 | December 5, 1975 | 17.73 ft |
| 21 | April 6, 1991 | 17.66 ft |
| 22 | February 11, 1990 | 17.46 ft |
| 23 | January 26, 1971 | 17.29 ft |
| 24 | December 30, 1996 | 17.29 ft |
| 25 | January 23, 1935 | 17.08 ft |
Most recent crests
- December 11, 2025: 143.27 ft
- January 28, 2024: 140.85 ft
- December 7, 2023: 142.28 ft
- March 2, 2022: 142.59 ft
- January 7, 2022: 145.21 ft
- November 13, 2021: 141.41 ft
- January 14, 2021: 142.88 ft
- January 4, 2021: 142.59 ft
- January 8, 2020: 142.41 ft
- December 22, 2019: 142.68 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.