Commissioners express caution on Chehalis Basin overflow dam; county abstains pending more analysis

Jan 22, 2026

Thurston County commissioners discussed the Chehalis Basin Flood Authority strategy, including a contested overflow dam proposal described as costly and controversial; county representatives said they are abstaining from a local Authority vote until more analysis and tribal input are available.

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Board members used committee reports on Jan. 21 to discuss the Chehalis Basin Flood Authority’s flood‑mitigation strategy and an overflow dam proposal that several participants described as controversial and expensive. Commissioners said the county has not taken a definitive stance on the dam and that they would abstain from acting on behalf of Thurston County until the board as a whole had more information and could deliberate.

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