Northwest Fisheries Science Center

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Document Type: Contract Report
Center: NWFSC
Document ID: 6179
Title: Demersal fishes, benthic and epibenthic invertebrates, and sediment characteristics at and adjacent to offshore disposal Site F, Coos Bay, Oregon, April 1992
Author/Editor: Susan A. Hinton, Robert L. Emmett
Publication Year: 1993
Publisher: National Marine Fisheries Service
Contracting Agency: U.S. Army Corps of Engineers. Seattle, Washington
Contract Number: E96920027 and E96920028
Pages: 54
Date: 1993

The U.S. Army Corps of Engineers (COE), Portland District has proposed to expand offshore disposal Site F off Coos Bay, Oregon, to accommodate additional dredged material from the Coos Bay channel-deepening project.  Site F has already been expanded to twice its original size, which is adequate for routine maintenance dredging but too small to hold the dredged material from the deepening project.  If Site F is expanded as proposed, it would be three times larger than the original Site F.

In 1979, during the initial designation process of Site F, a pilot study was conducted at and adjacent to Site F and the proposed expansion area by researchers from Oregon State University under contract to the COE.  The COE and the Environmental Protection Agency are joint designators of the site.  Together, they decided that the proposed expansion could take place if the biological communities have not changed significantly since 1979.  Therefore, in March 1992, the National Marine Fisheries Service (NMFS) agreed to cooperate with the COE to conduct the first of two biological surveys at the present disposal area and the proposed expansion area.  In addition, an inshore area near the north spit was sampled to determine if it could be used as an alternative to the expansion area.  This report contains the results from the first biological survey (April 1992).  No comparisons to the 1979 data are possible at this time, but detailed comparisons will be made in a future report if NMFS is able to obtain site-specific information from the COE or researchers who conducted the 1979 study.