Chehalis River near Grand Mound
Thurston County, Washington
The past week
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What floods at each level
- 146 ft
the 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.
- 144.5 ft
the 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.
- 142.5 ft
the 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 ft
the 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.
- 139.5 ft
the Chehalis River in Thurston County will locally spill out of its banks into nearby fields and over a few roads.
Highest crests on record
| Date | Level | Flow |
|---|---|---|
| Dec 4, 2007 | 147.26 ft | 79,100 cfs |
| Jan 7, 2022 | 145.21 ft | 51,269 cfs |
| Dec 11, 2025 | 143.27 ft | 32,114 cfs |
More on Chehalis River
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