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<br />. <br /> <br />o <br />o <br />N <br />-J <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />Table 2-1 <br />Observed Flow-Weighted Average Salinity <br />at the Numeric Criteria Stations <br />(Total Dissolved Solids in mg/L)' <br /> <br />Calendar Year Below Hoover Dam Below Parker Dam At Imperial Dam <br />1972 724 734 861 <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 691 711 760 <br />1981 681 716 821 <br />1982 680 713 826 <br />1983 658 678 727 <br />1984 597 611 675 <br />1985 556 561 615 <br />1986 517 535 577 <br />1987 519 538 612 <br />1988 529 540 648 <br />1989 564 559 683 <br />1990 587 600 702 <br />1991 629 624 749 <br />1992 658 651 767 <br />1993 660 631 784 <br />1994 - 668 673 796 <br />1995 655 665 797 <br />1996' 619 648 768 <br />1997 588 609 713 <br /> <br />Colorado River water users in the Lower Basin have suffered significant economic impacts <br />due to long-term continued use of water with elevated salinity levels, Figure 2-3 indicates salinity <br />damages resulting from long-term continued use at various levels of salinity based on a 1988 Bureau <br />of Reclamation (Reclamation) study, At current salinity levels, as shown in Figure 2-3, these <br />damages are estimated to be in excess of $600 million per year. The Metropolitan Water District <br /> <br />IDetermined by the U.S, Geological Survey (USGS) from data collected by the U,S. Bureau of <br />Reclamation and USGS and published in Oualitv of Water, Colorado River Basin, Proeress Reaort No. 19, 1999 <br /> <br />2Data for 1996 and 1997 based upon provisional records, <br /> <br />2-5 <br />