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<br />WEIGHTED MONTHLY SALINITIES AT <br />SELECTED COLORADO RIVER STATIONS 2' <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 ImDerial Dam national Boundarv <br /> 5-Year 5-Year 5-Year 5-Year 5-Year <br /> avg.Y avg.Y avg.'/ avg.Y avg.Y <br /> 1974-78 2003 2004 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 1,041 891 <br /> Feb. 675 640 706 627 732 636 835 700 998 798 <br /> March 684 601 699 621 727 629 805 679 925 787 <br /> April 680 615 700 628 714 631 801 680 892 777 <br />, May 677 621 698 625 709 633 822 723 962 878 <br />"" June 678 621 695 632 712 634 812 711 956 844 <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 /> <br />Running <br />12-Month <br />Flow-WId. <br />Differential 31 <br />2003 2004 <br /> <br />o <br />o <br />~ <br />..... <br />N <br />c.;;, <br /> <br />General Notes: <br /> <br />1/ Salinities based on "sum of constituents". <br /> <br />7J 5-Year averages are arithmetic <br /> <br />'9/ 12-month flow-weighted differential between NIB and Imperial Dam through month shown in left column. <br /> <br />. <br /> <br />143.5 99.9 <br />1373 <br />137.7 <br />134.9 <br />130.8 <br />127.2 <br />127.6 <br />131.0 <br />133.2 <br />133.0 <br />136.4 <br />136.0 <br /> <br />. <br />