42 



25.000 



c 



o 

 O 



£ 



(0 



Q 



o 

 n 



03 



I 



CD 

 O 



20,000 



15,000 



10.000 



5,000 



Ice Harbor Dam OperationaJ in 1 961 



1 st Lyons Ferry Hatchery Returns 



ESA Petiton 

 Br St Dev. Hatted 



ESA 

 Listing 



1965 



1969 



1973 



1977 



1981 



1985 



1989 



1993 



Adults 



■Jacks' 



Figure 1. Number of fall Chinook counted past Ice Harbor Dam since 1965, 



the year in which the major Snake River dams became operational, 

 and years associated with ESA and hatchery events. 



