300 400 500 600 700 



RIVER MILES FROM MOUTH OF COLUMBIA 



JULY. AUG, SEPT AVG- 

 OEC 



FIG 14.-- COMPARISON OF COLUMBIA RIVER WATER QUALITY - CANADA TO MOUTH 



JULY, AUG. SEPT AVG. 

 OEC 



300 400 500 600 700 



RIVER MILES FROM MOUTH OF COLU^BIA 



FIG. 15. -COMPARISON OF COLUMBIA RIVER WATER QUALITY - CANADA TO MOUTH 



