Foreword 



The studies included in this report were conducted at the 

 Corvallis Laboratory, Section Western Fish-Cultural Investigation, 

 TJ» S. Fish and Wildlife Service. The laboratorj'- facilities, equip- 

 ment, and supplies contributed to these studies by the Section of 

 Sanitary Engineering, School of Engineering and Industrial Arts, 

 and by the Department of Fish and Game Management at Oregon State 

 College are gratefully acknowledged. The invaluable advice and in- 

 terest contributed to the study by Professors R<, E. Dimick and Fred 

 Merryfield were particularly helpful as were the stream flow data 

 provided by the Portland District Office, Corps of Engineers o 



