Compared to native plant species, knotweed shows a decreased ability to control erosion despite having an extensive root system. During flood events, plant fragments are washed downstream where rhizome and stem pieces create new infestations. Increased sediment is a factor in the loss of productive salmonid habitat. Sediment can fill in the spaces between riverbed spawning gravels and fill in pools used for rearing. Itnegatively affects salmonids by smothering viable eggs, decreasing their feeding success, and damaging gill filaments. Knotweed negatively affects aquatic invertebrates that compose the basis of the aquatic food chain by an alteration of the quality and timing of the leaf litter regime. This alteration changes nutrient inputs and soil composition. Invertebrates are the primary food source of juvenile fish species.  Goal: The goal of this project is to identify all knotweed infestations and treat on a worksite by worksite (subbasin) determined by funding availability. Work is planned to occur in the Tahuya-Dewatto and Union-Mission subbasins. Outcomes: Location, Control, Monitoring of Knotweed infestation, and restoration of riparian corridors. Best science demands a three year control cycle.