Interim Lower Snake, Clearwater, and Mid-Columbia Rivers Dredging. Lower Granite, Little Goose, Lower Monumental, Ice Harbor, and McNary Reservoirs Washington, Idaho, and Oregon

摘要

This environmental assessment considers the effects of proposed interim navigation and maintenance dredging and dredged material disposal to be performed by the Walla Walla District Corps of Engineers at various locations in the lower Snake River, the lower Clearwater River, and the mid-Columbia River. This EA addresses dredging and disposal actions that would take place during the years 2000 through 2003, or until the Walla Walla District's Dredged Material Management Plan/Environmental Impact Statement is completed and in effect. The dredging to be performed is only that which is necessary until the DMMP/EIS is in place. The purpose of the dredging is to restore the authorized depth of the navigation channel, remove sediment from port areas, provide for recreational use, and provide for wildlife habitat planting irrigation.