TABLE 2. --Annual counts of salmon and steelhead at Rock Island Dam, 



1933-1959 



^ Incomplete count. 



2 Counts for the period from May 4 through Jxily 15, 1959, were com- 

 puted by extrapolating sample counts. 



length were enumerated as small fish. 

 Number of sockeye recorded as "small" 

 was 8,383 (11.6 percent). 



Tables 6 and 7 show semimonthly 

 totals of number and percentage of 

 sockeye count ascending each ladder. 



Of the sockeye passing Rock Island 

 Dann 55.5 percent ascended the left 

 ladder, while 23.0 and 21.5 percent 

 ascended the middle and right ladders, 

 respectively. Data pertaining to sock- 

 eye daily counts are contained in 

 tables 9-12. 



