Table 1. — Annual counts of salmon and steelhead trout at Rock 

 Island Dam, 1933-60. 



1/ Incomplete count. 



2/ Counts for the period from May 4 through July 15, 1959, were 



computed by extrapolating sample counts. 



Table 2. — Monthly totals of all anadromous fish counted at Rock 

 Island Dam, 1960. 



