Lower Quinault Major Tributaries Knotweed Control Riparian habitat is crucial to the life cycle of salmon species resident in the Quinault Watershed. Invasive plants, such as knotweed, alter and damage that habitat and if not controlled have severe impacts on salmon. The goal of this project was to control knotweed in the watersheds of the major tributaries of the lower Quinault as part of an ongoing strategy to rid the whole watershed of this invasive plant. This project targeted approximately 68,635 acres covering 9 sub-watersheds. This 4 year project expected to remove knotweed from these areas streams (321 miles) and roads (195 miles) in these tributaries. The community of the reservation is involved through the Land and Natural Resource Committee of the QIN. This was the second knotweed control project in the Quinault Watershed. Prairie Creek sub-watershed has had 7 years of successful treatment. The fourth year of this Lower Quinault Major Tributaries project coincided with the first year of the Lower Quinault floodplain. The QIN has coordinated efforts with Grays Harbor County, Olympic National Park and the USFS to treat the lands in the entire Quinault Watershed.