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<br />N <br />~ <br />W <br />...... <br /> <br />Historical Uses <br /> <br />,--,- <br /> <br />Estimated historical Upper and Lower Basin uses for the <br /> <br />calendar year 1973 through 1979 are shown on Table 2. <br /> <br />Salinity at Monitoring Stations <br /> <br />salinities at monitoring stations below Hoover Dam for <br /> <br />the years 1973 through 1979 are shown on Table 3. These <br /> <br />values are all less than the 1972 numeric criteria. <br /> <br />TABLE 3 <br /> <br />FLOW-WEIGHTED AVERAGE ANNUAL SALINITIES <br />AT SELECTED STATIONS <br />(Total Dissolved Solids inmg/l*) <br /> <br /> Calendar Year <br /> Numeric <br /> Cri teria 1973 1974 1975 1976 1977 1978 1979 <br />Below Hoover <br />Dam 723 706 686 685 674 667 686 694** <br />Below Parker <br />Dam 747 726 700 702 699 681 681 703** <br />At Imperial <br />Dam 879 846 836 828 823 821 812 809** <br /> <br />* Determined annually by the Water and Power Resources Service <br />from data collected by the U.S. Geological Survey. <br /> <br />** Provisional records. <br /> <br />-4- <br /> <br />,>~;\~~,~'if,.' <br />