The Bord of County Commissioners recently adopted a revised Floodplain Management Ordinance, effective November 21, 2023. The primary difference between the new and the prior code (2015) is the minimum elevation has been reduced to one foot above Base Flood Elevation for all regulated waterways. Please refer to the updated ordinance for all new building permits and land use applications subject to floodplain regulations. Chapter 16.25 - Revised Floodplain Management Ordinance
Image: Map of watersheds for Cowlitz County.
