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<br />WEIGHTED MONTHLY SALINITY AT <br />SELECTED COLORADO RIVER STATIONS l' <br />AND RUNNING 12-MONTH NIB-IMPERIAL FLOW-WEIGHTED SALINITY DIFFERENTIAL <br />(in parts per million) <br /> <br /> Below Below Palo Verde At At Northerly Inter- <br /> Hoover Dam Parker Dam Canal Near Blvthe Imperial Dam national Boundarv <br /> 5-Year 5-Year 5-Year 5-Year 5-Year <br /> avg.~ avg.~ avg..<1 avg.~ avg.~ <br /> 1974-78 2003 2004 4/ 1974-78 2003 2004 1974-78 2003 2004 1974-78 2003 2004 1974-78 2003 2004 <br /> Month <br /> Jan. 690 623 653 709 665 751 648 913 711 766 1,041 891 890 <br /> Feb. 675 640 657 706 627 732 636 835 700 708 998 798 817 <br /> March 684 601 648 699 621 727 629 805 679 695 925 787 787 <br /> April 680 615 645 700 628 714 631 801 680 704 892 777 770 <br />, May 677 621 643 698 625 709 633 822 723 714 962 878 872 <br />-.J June 678 621 655 695 632 712 634 812 711 734 956 844 877 <br />, <br /> July 682 623 688 635 709 637 797 671 909 810 <br /> August 690 620 686 631 706 635 800 689 907 867 <br /> Sept. 672 618 686 634 737 643 815 708 952 869 <br /> Oct. 680 628 689 634 739 639 854 726 1,070 930 <br /> Nov. 682 641 692 746 897 766 1,010 952 <br /> Dec. 681 645 702 731 877 772 999 896 <br /> General Notes: <br /> 11 Salinity based on "sum of constituents". <br /> ?! 5-Year averages are arithmetical. <br /> <br />"JI 12-month flow-weighted differential between NIB and Imperial Dam throu9h month shown in left column. <br /> <br />~-' May and June are partial month mesurments, rest of month values unavailable due to equipment failure. <br /> <br />. <br /> <br /><:::1 <br />o <br />.... <br />...... <br />Running ...... <br />12-Month CJ::i <br />Flaw-WId. <br />Differential 31 <br />2003 2004 <br /> <br />. <br /> <br />143.5 132.8 <br />137.3 134.8 <br />137.7 133.3 <br />134.9 128.9 <br />130.8 129.4 <br />127.2 129.4 <br />127.6 <br />131.0 <br />133.2 <br />133.0 <br />136.4 <br />136.0 <br /> <br />. <br />