Table 1. — Annual counts and periods of counting of salmon and steeliiead 

 trout at Rock Island Dam, 1933-63 1 



(Number of fish) 



1 The above counts are now considered to be the official record of fish 

 passing flock Island Dam. 



Table 2. — Monthly number of salmon and steelhead trout counted at 

 Rock Island Daii, 1963 



