3. For practical purposes, a pipe with 

 a diameter of 0,6 m., flooded or partly full 

 of water, is used by all salmon and trout. 

 Salmon and trout will not readily enter a 

 0.3-m. -diameter pipe unless special condi- 

 tions of water velocity and transition from 

 pool to pipe are provided. 



ACKNOWLEDGMENTS 



The late Joseph R. Gauley helped plan the 

 experiments and made helpful suggestions 

 on test procedures. Robert J. Holcomb gave 

 advice on hydraulics that contributed to the 

 design of the pipe system. 



LITERATURE CITED 



COLLINS, GERALD B., and CARL H. ELLING, 

 i960. Fishway research at the Fisheries- 

 Engineering Research Laboratory. U.S. 

 Fish Wildl. Serv., Circ. 98, 17 pp. 



DIXON, WILFRID J., and FRANK J. MASSEY, 

 JR. 

 1957. Introduction to statistical analysis. 

 2d ed. McGraw-Hill Book Company, 

 New York, 488 pp. 

 JOHNSON, JAMES H. 



1966. Fallback of adult chinook salmon at 

 Ice Harbor Dam spillway. May 1964. 

 U.S. Army, Corps of Eng. {Portland, 

 Oreg,), Third Progr. Rep. on Fish.- 

 Eng. Res. Program, pp. 67-90. 

 U.S. ARMY CORPS OF ENGINEERS. 



1948. Annual report, passage of fish over 

 Bonneville Dam, Columbia River, 

 Oregon and Washington. U.S. Army 

 Corps of Eng., Off. Dist. Eng., Port- 

 land, Oreg., 21 pp. 

 1951. Annual report, passage of fish over 

 Bonneville Dam, Columbia River, 

 Oregon and Washington. U.S. Army 

 Corps of Eng., Off. Dist. Eng., Portland, 

 Oreg., 36 pp. 



MS. #1928 



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