UNITED STATES DEPARTMENT OF THE INTERIOR 



Stewart L. Udall, Secretary 



FISH AND WILDLIFE SERVICE, Clarence F. Pautzke, Commissioner 

 Bureau of Commercial Fisheries, Donald L. McKernan, Director 



Annual Fish Passage Report - Rock Island 

 Dam Columbia River, Washington, 1964 



By 

 PAUL D. ZIMMER and JOHN H. BROUGHTON 



United States Fish and Wildlife Service 

 Special Scientific Report- -Fisheries No. 515 



Washington, D.C. 

 April 1965 



