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How do I discourage beaver from plugging my culverts and building dams that flood my property?
To remove or modify a beaver dam, you must have a Hydraulic Project Approval (HPA)—a permit issued by WDFW—for work that will use, obstruct, change, or divert the bed or flow of state waters (RCW 77.55).
See WDFW's "Living with Wildlife: Beavers" fact sheet for specific information on tools to address plugged culverts and flooding.