DESCRIPTION
The project request was for feasibility study and 30% design of the Downey Farmstead Restoration Project. Four parcels totaling 21.81 acres are located along the left bank of the Green River from RM 21.7 to 22.2. Three parcels were purchased by the City of Kent in 2008, the fourth parcel was purchased by the City of Kent in 1996. One of the parcels contains a reach of Mullen Slough and the confluence of Mullen Slough with the Green River. The restoration project will involve relocating Frager Road, which currently runs parallel to and very close to the top of bank of the Green River, to the southern most portion of the properties, creating a greater buffer/setback adjacent to the Green River. The project will include creation of floodplain storage and side channel refuge habitat parallel to the Green River to increase access to floodplain habitat for Chinook and other salmonids and to restore floodplain functions. Additional phases of the restoration project will include removal of invasive plants, native riparian re-vegetation and installation of wood debris structures. Hydraulic and soil studies were conducted to determine the feasibility of connecting a side channel to the mainstem of the Green River. The study also included hydraulic and geotechnical analysis of the south bank of the Green River and feasibility of reshaping and restoring the bank to provide stability for restoration and enhancement of fish habitat throughout this reach.