La Center Wetlands, East Fork Lewis River, Washington
Inter-Fluve supported the Lower Columbia Estuary Partnership in identifying restoration opportunities, designing and constructing this large-scale floodplain reconnection project. Project design elements included breaching existing levees to reconnect surface water from the East Fork Lewis River to adjacent floodplains to enhance off-channel habitat for ESA-listed salmonids and native aquatic species. The project improved off-channel rearing and winter refugia for juvenile salmonids, removed two fish passage barriers, installed habitat large woody material, created riparian buffers, and naturalized a drainage canal. A roughened channel improved fish access to an existing wetland while still maintaining water levels within the wetlands. A 2D model was used to evaluate the impacts of project design elements, including on adjacent private and public landowners.