Corps of Engineers should also moni- 

 tor sediment particle movement from 

 the test site to determine its fate. 

 It is recommended that riverine and 

 oceanic sites with hydraulic scouring 

 be evaluated biologically to deter- 

 mine why some areas are rich in spe- 

 cies and others are not. 



ACKNOWLEDGEMENTS 



the Columbia River estuary. 

 NMFS. Coastal Zone and Estuarine 

 Studies. 1980; 44p. 



Higley, D.L.; Holton, R.L. Bio- 

 logical baseline data Youngs 

 Bay, Oregon. Final Report 1 

 November 1973 through 30 April 

 1975. Corvallis, Oregon: School 

 of Oceanography, Oregon State 

 University, 1975; 75-6p. 



This study was conducted with 

 contractual assistance from the 

 Portland District, U.S. Army Corps 

 of Engineers, DACW 57-79-F-9145 . 

 We appreciate the cooperation and 

 assistance of Jack Bechley, Navi- 

 gation Division. Roy Pettit, Nick 

 Zorich, and David Miller contributed 

 essential effort in the studies 

 data gathering phase while Sandy J. 

 Lippovsky assisted with laboratory 

 analysis of stomach contents. Imo- 

 gene Abrahamson typed the manuscript 

 and Jim Peacock prepared plates for 

 the figures. We are indebted to 

 these and other staff personnel in 

 Hammond, and Prescott, Oregon and 

 Seattle, Washington who supported 

 this effort. 



REFERENCES 



Higley, D.L.; Holton, R.L. A grab- 

 sample study of the benthic in- 

 vertebrates of the Columbia Riv- 

 er estuary. Supplemental data 

 Rep. 1 November 1975 through 29 

 February 1976. Port of Astoria. 

 1978; 76-3p. 



Pinkas, L. ; Oliphant, M.S.; Iver- 

 son, I.L. Food habits of al- 

 bacore, bluefin tuna, and boni- 

 to in California waters. Cali- 

 fornia waters. Calif. Dept. 

 Fish and Game; Fish Bull. 1971; 

 105p. 



Sanborn, H.R. Benthic infauna ob- 

 served at five sites in the 

 Columbia River from August 19 

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 Fish. Ser. Final Rep. to U.S. 

 Army Corps of Engineers and Col. 

 Riv. Prog. Off. ; 1973; 19p. 



Durkin, J.T. An investigation of 

 fish and decapod shellfish 

 found at four dredge disposal 

 sites adjacent to the mouth of 

 the Columbia River. Report to 

 Portland District Corps of En- 

 gineers and NMFS Columbia Riv- 

 er Program Office; 1975; 29p. 



Durkin, J.T.; Emmett, R.L. Benthic 

 invertebrates, water quality and 

 substrate texture in Baker Bay, 

 Youngs Bay and adjacent areas of 



Sanborn, H.R. An investigation of 

 the benthic infauna at two 

 dredge and four dredge dispo- 

 sal sites adjacent to the mouth 

 of the Columbia River. Nat. Mar. 

 Fish. Ser. Final Rep. U.S. Army 

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Twenhofel, W.M. ; Tyler, S.A. Meth- 

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