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<br />ARIZONA <br /> <br /> <br />o <br />CO <br />CJl <br />N <br /> <br />United States Geological Survey <br />Colorado River Basin Salinity Control Program <br />Accomplishments for Fiscal Year 1998 <br /> <br />WELL INVENTORY OF THE LOWER COLORADO RIVER FLOOD PLAIN AND <br />ADJACENT AREAS IN ARIZONA, CALIFORNIA, NEVADA, AND UTAH <br /> <br />'.,i <br />" <br /> <br />The U.S. Supreme Court decree, 1964, Arizona v. California, is specific about the <br />responsibilIty of the Secretary of the Interior to account for consumptive use of water from the. <br />mainstream; consumptive use is defined to include "water drawn from the mainstream by <br />underground pumping." Water pumped from wells on the flood plain is presumed to be <br />Colorado Rivet water and the accounting surface can be used to identify wells outside the flood <br />plain in and near the lower Colorado River valley that yield water that will be replaced by water <br />from the riyer. The objective of this cooperative project between the U.S. Geological Survey <br />and the Bureau of Reclamation is to inventory wells on the lower Colorado River flood plain <br />and adjacent areas in Arizona, California, Nevada, and Utah. Work on the project began in <br />April 1994;to locate wells, provide current information for each well, and provide precise <br />position in~ormation in order to apply the accounting-surface method and include the appropriate <br />wells in w*er accounting along the river. Water levels are required where possible for all wells <br />in areas adjacent to the flood plain. Over 1,200 wells have been inventoried in the Yuma area. <br />and southeast Imperial Valley and over 1500 wells have been inventoried on and near the <br />Colorado River and Chemehuevi Indian Reservations and in Palo Verde and Cibola Valleys. <br />The inventery has been expanded to include river pumps; about 210 river pumps have been <br />inventoried. Data on over 1400 wells and river pumps in Arizona and California have been <br />entered into the U.S. Geological Survey data bases; sites in Arizona in the Arizona District <br />data base and sites in California in the California District data base. The inventory of wells and <br />river pump~ in Arizona along the Parker Strip between Parker Dam and the bounilary with the <br />Colorado River Indian Reservation was completed in 1998. <br /> <br />;,1 <br /> <br />'t~ <br /> <br />,'f <br /> <br />l. <br />J <br />,4 <br />.j <br /> <br />'tf <br />., <br />t <br />.~ <br />'.f <br /> <br />), <br />"..1' <br /> <br />f <br /> <br />:'J" <br /> <br />] <br />. <br />1 <br />:1 <br /> <br />DETERMINATION OF THE EXTENT OF THE RIVER AQUIFER IN THE LOWER <br />COLORAbO RIVER VALLEY NEAR YUMA, YUMA COUNTY, ARIZONA, AND <br />IMPERIAL COUNTY, CALIFORNIA <br /> <br />The U.S. S.upreme Court decree, 1964. Arizona v. California, requires the identification of the <br />users of Colorado River water and publication of the quantities of diversion and consumptive <br />use stated for each diverter. point of diversion, and State. To aid in implementing the court <br />decision, tlie extent of the river aquifer must be determined as part of the method to identify <br />wells dow~tream from Laguna Dam that yield water that will be replaced by water from the <br />Colorado River. Particular areas of concern in delineating the boundary are in southeastern <br />Imperial C6unty, California, from the northerly international boundary with Mexico to the <br />Chocolate Mountains and in Yuma County, Arizona, between the Gila and Laguna Mountains. <br />The objectives of this cooperative project between the U.S. Geological Survey and the Bureau <br />of Reclamation are to (I) use gravity studies to determine the extent and thickness of the <br /> <br />, <br />'{ <br />1 <br />j <br /> <br />-J1 <br /> <br />:1 <br />"t <br />" <br />! <br />"j <br /> <br />" <br /> <br />7 <br /> <br />. 1 <br />1 <br />t <br />j, <br />, <br />; j <br />~.; ; :11 <br />ad' <br />. _ ,Th ~> '-i!b\;-&k _3"'i"~ <br /> <br />j <br /> <br />!..J.,.....,'. <br />