42) 



ANNUAL FISH PASSAGE REPORT 



ROCK ISLAND DAM 



COLUMBIA RIVER, WASHINGTON 



1961 



Marine Biological Laboratory 



MA- G 1963 

 WOODS HOLE, MASS. 



SPECIAL SCIENTIFIC REPORT-FISHERIES Na 421 



UNITED STATES DEPARTMETfT^^ 



FISH AND WILDLIFE SERVICE 



