Table 6. — Semimonthly number and percent of sockeye salmon counted over each ladder, Rock Island 



Dam, 1963 



1 Middle ladder inoperative from May 1-20. 



2 Right ladder inoperative for several hours on Sept. 1. Closure was made in order to permit 

 removal of debris. 



Table 7. — Semimonthly number and percent of coho salmon counted over each ladder, Rock Island Dam, 



1963 



1 Middle ladder inoperative from May 1-20. 



2 Right ladder inoperative for several hours on Sept. 1. Closure was made in order to permit 

 removal of debris. 



