5 10 15 20 25 



Scale in Mi les 



BRITISH COLUMBIA 

 WASH I NGTON 



k.1 



,Lake Vaseaux 



\ 

 Similkameen R.' 



lOsoyoos Lake 



<OrovilleW-Zosel Dam 



9) 



\0 



o 



i- 



^^ 



c/ 

 oJ 



o 



'*'/. 



Twisp' 



->c, 

 O 



v_ 



l<^. 



Lake Wenatchee 



Lake 

 Chelan 



<9>. 



.Brewster -JMonse 



WellsDom 



i»V^ Chief Joseph Dam 



Grand Coulee 

 Dam 



^\^><<> 



^5 



STumwaterf ^ 

 Dam/ \ 



.^-^^ 



^O 



'Rocky Reach Dam 



k,Wenatchee 



Rock Island 

 Dam 



132 



Figure 1. — The Columbia River and the locations important to the present study. 



U.S. FISH AND WILDLIFE .SERVICE 



