UNITED STATES DEPARTMENT OF THE INTERIOR, Stewart L. Udall, Secretary 



FISH-SiND WILDLIFE SERVICE, Clarence F. Pautzke, Commissioner 

 Bureau of Commercial Fisheries, Donald L. McKeman, Director 



ANNUAL FISH PASSAGE REPORT - ROCK ISLAND DAM 

 COLUMBIA RIVER, WASHINGTON, 1961 



by 



Paul D. Zimmer and John H. Broughton 



United States Fish and Wildlife Service 

 Special Scientific Report— Fisheries No. 421 



Washington, D. C. 

 April 1962 



