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<br />Salinity Concentration at Monitoring Stations <br /> <br />o Salinity concentrations for the years 1973-1987 at the <br />CJl <br />1-.... three stations at wh ich numer ic cr iter ia have been set , below <br />o <br /> <br />Hoover Dam, below Parker Dam and at Imperial Dam are shown in <br /> <br />Table 3. These concentrations are all less thal1 the numeric <br /> <br />criteria. <br /> <br />TABLE 3 <br />FLOW-WEIGHTED AVERAGE ANNUAL SALINITY CONCENTRATIONS <br />AT SELECTED STATIONS <br />(Total Dissolved Solids in mg/l*) <br /> <br /> Below Hoover Below Parker At Imperial <br />Calendar Year Dam Dam Dam <br />Numeric Criteria 723 747 879 <br />1973 675 709 ,*,' 843 <br />1974 681 702 834 <br />1975 680 702 829 <br />1976 674 690 822 <br />1977 665 687 819 <br />1978 678 688 812 <br />1979 688 701 802 <br />1980 691 712 760 <br />1981 681 716 821 <br />1982 679 717 826 <br />1983 665 698 710 <br />1984 611** 642** 670** <br />1985 500** 580** 607** <br />1986 512** 543** 579** <br />1987 515** 544** 610** <br /> <br />*Determined by the U.S. Geological Survey (USGS) from data <br />collected by Reclamation and the U.S. Geological Survey <br />and published in "Quality of Water - Colorado River <br />Basin," progress Report No. 13, January 1986. <br /> <br />**provisional records. <br /> <br />-6- <br />