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Benthic and epibenthic invertebrates, fishes, and sediments at and adjacent to a proposed new site for Area D, an in-water dredged-material disposal site in the lower Columbia River, 1991
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1993
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Description:The U.S. Army Corps of Engineers (COE), Portland District, is responsible for maintaining navigation channels in the Columbia River estuary. This responsibility requires annual dredging and disposal of millions of cubic yards of bottom sediments. One in-water disposal site in the lower estuary, commonly referred to as Area D, no longer provides safe operating depths for large dredges, so the COE has proposed relocating the disposal site immediately downstream from the present Area D (Fig. 1). In February 1991, the COE contracted the National Marine Fisheries Service (NMFS) to conduct two biological surveys: one in March and one in June 1991. These surveys were conducted at the proposed site for Area D and two adjacent areas to provide baseline information concerning species composition and abundance of benthic invertebrates, Dungeness crabs (Cancer magister), shrimps, and fishes. Subsequently, the COE funded two additional surveys, which were completed in September and December 1991.
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Rights Information:CC0 Public Domain
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