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:2203 Table 6 SUMMARY OF OPERATIONS BY AGENCIES BELOW PARKER DAM FOR WATER YEAR 1968 DispOJit1"on of Water Ordered but not taktn DtlifJeud to Storage ExctJs T akin Dr/iotred by Otlurs to Mexico ScJl(dultd Ordtred but Percmt Ordtr not taken not taken Dislrict CalijQrni4 Coachella Valley County Water DistricL_________nn_ Imperial Irrigation District. _ _ h _ _ _.. _. ~ _ _ __ ~ _ __ __ _ __ Reservation Division, Yuma Project. _ _ _ _____~_____ _.. Palo Verde Irrigation DistricL______________~_____~~_ California TotaL _ _ _ _... _ _ _ _ _ __ _ _ _ _ _ _ _ _. _. _ __ _ __ 452,550 2,783,405 85,767 876,092 4,197,814 i Arizona North Gila Valley Irrigation District_____________hh_ Welton-Mohawk Irrigation DistricL_____ _____________ South Gila Valley Unit_____n________h_____________ Yuma Mesa Irrigation and Drain. Dist.. ___________ h_ Unit B Irrigation and Drain. Dist.____________________ Yuma County Water User's Assoc,____ _ __ __ ________ ___ Colorado River Indian Reservation____________________ 57,329 480,156 37,020 249,5S9 39,415 317,654 499,734 ArizDna. TotaL _ ____ _ _ _ __ __ ______ _ _ _ _ __ _________ 1,680,867 Total'California and Arizona_____________________ 5,878,681 0 0 32,912 1.2 25,749 635 6,528 11,170 13 4,009 6,791 370 23,465 2,7 19,254 2,136 2,075 -- 67,547 1.6* 49,012 9,562 8,973 8,306 14 5,074 3,052 180 25,315 5.3 14,319 9,572 1,424 2,550 6,9 1,599 915 36 15,241 6.1 8,198 6,198 845 2,837 7,2 1,641 1,014 182 26,479 8.3 12,381 12,244 1,854 4,019 ,08 2.456 1,305 258 84,747 5.0. 45,668 34,300 4,779 152,294 94.680 43,862 13,752 . P('r(:('nt computed from touls, not by addition of other p~rcenUgel. The reductions in excess deliveries to Mexico are attributed to improved river operation by the Bureau of Reclamation, regulation afforded by Senator Wash Project, and cooperation on the part of the warer users by more stringent water scheduling. As an example, the Coachella Valley County W' ater District operated its sys- tem wirhout rejecting any water ordered at Imperial Dam during 1968. Table t\ shows the Bureau of Reclamation records of scheduled orders and water rejected by all agencies below Parker Dam for the water year 1968. Of the 152,294 acre-feet of total water ordered but not taken, 94,680 acre-feet was delivered to stor'age, 43,862 acre-feet was accepted by other users, and 13,752 acre-feet of rejected water was de- livered ro Mexico in excess of treaty require- ments. California agencies ordered but did not take 1.6 % of the total requested diversions. The comparable figure for Arizona was 5.0%. River Management The Bureau of Reclamation, United States Department of the Interior, has the responsibil- ity for the operation and control of the Colorado River under the "Colorado River Front and Levee System Act" of 1927 and subsequent amendments, The Bureau schedules releases from the various reservoirs and control structures, constructs and maintains levees and channel car- rying capacities to contain programmed flood flows, reduces warer losses through both con- struction and operation activities, and in co- operation with the Bureau of Sport Fisheries and Wildlife mitigates fish and wildlife losses, The Bureau has proposed a further expansion of some of these activities in its Lower Colorado River Management Program. The early activities involving river manage- ment were directed to the problem of flooding and sediment control in the Mohave Valley and the area below Imperial Dam. As the program expanded to cover other reaches of the river, other groups became interested, especially fish and wildlife representatives, which resulted in the development of a multipurpose program. The Bureau's original plans were modified through cooperative work by it, the Bureau of Sport Fisheries and Wildlife, and the Lower Colorado River Land Use Office. Adjustments for fish and wildlife considerations continue to be made in the various divisions of the program. Total costs for the river management work, ex- cluding the Imperial and Limitrophe Divisions, 29