Table 14. — Water quality suramary - monthly average. 

 [Chemical characteristics in rag. /liter where applicable] 



5ta: Col umbia River at Rock Island 

 Suumarj' reriod; r??^ ^ r- - " 5° " 57 



-ti. i-Jc-ljO : asl;n-ticn: c - 453.4 



jk U. 0. flatui'. ie at sea lev©!; -Ukaiiaity and hardnt^SK 

 oonductlTiiy In niicro.Tihos ^.er cm, i.t 23 °C. 



1 - 1954 T - Trace 



2 - 1955 (4) 1957 



3 - 1956 5 - Avg. Monthly at Trinidad 



'.s eju-ivslent CsGO,! 



51 



