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Electrochemical testing of austenitic stainless steels S30400 and S31600 in a simulated Colorado river water has shown a marked effect of chloride ion concentration and temperature on the crevice corrosion performance of these alloys. The data have been plotted as potential/temperature diagrams, showing the electrochemical parameters, primary passivation potential, protection potential, rupture potential, cathodic current minimum potential and the occurence of hysteresis loops. The data has been analyzed to determine the resistance of the two stainless steel alloys to crevice corrosion as a function of chlorid concentration and temperature. The experimental data is useful in evaluating the two alloys for fresh water applications where the operating temperature and the chloride concentrations are known.