21.1 

 15.6 

 10.0 



15.6 

 10.0 



15.6 

 10.0 



15.6 



<-> 10.0 



e 



^ 15.6 



I- 



c 10.0 

 a. 



LiJ 



I- 15.6 

 q: 



< 



5 



10.0 



15.6 

 10.0 



15.6 

 10.0 



15.6 

 10.0 



15.6 

 10.0 



SPRING 

 1946 



1947 



1948 



1949 



1950 



-^ 



1951 



1952 



1953 



1954 



1955 



FALL 



TEMPERATURE 

 175-PERCENT 

 PERIOD 



20 30 lb 20 30 

 "APR. MAY 



I I I I I ^ r 



10 20 30 10 20 30 10 20 30 10 20 

 JUNE JULY ALKi SEPT. 



Figure 10. — Columbia River water temperatures at Bonneville Dam during periods when 75 percent 

 of the spring, summer, and fall chinook salmon runs passed the dam, 1946-55. 



486 



U.S. FISH AND WILDLIFE SERVICE 



