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<br />.". <br /> <br />~i~ <br /> <br />~ ',.,' <br /> <br />!:;:~: <br />h:~~ <br />':-';l) <br /> <br />'~~.~: <br />'..:,;~ <br /> <br />-';.,.;:. <br />ii: <br />.~~ <br /> <br />~~:'~ <br />......<t <br />~s <br /> <br /><4. <br /> <br />',', <br />,.,.,.' <br /> <br />" ~., <br />~~~ <br /> <br />'~;:; <br />~j~~ <br /> <br />r-:::. <br /> <br />S';." <br />~\ <br /> <br />~;., '~ <br />~- :{:; <br />:~:' <br /> <br />,:r,; <br />;:;,~~~ <br />:~~~: <br /> <br />'.'.> <br />:.it;, <br /> <br />':.-x <br /> <br />III <br /> <br />'~~~ <br />:.A <br /> <br />:;;~ <br /> <br />,.',:.; <br />,~:/ <br /> <br />!)} <br /> <br />'u;' <br />'~~ <br />:..:_} <br /> <br />:~. ~) <br /> <br />fe'.' <br />I 2": <br /> <br />{,:~, <br /> <br />~';:\' <br />',":;' <br />~ <br /> <br />(0 <br />'.~) <br />l!J <br />N <br />o <br />c.') <br /> <br />to reduce salt discharges to the Colorado River by controlling salinity <br />and erosJon from the Basin's irrigated lands and contributing water- . <br />shed areas. The results of the study will be presented in a USDA report <br />which will interface with U. S. Bureau of Reclamation reports on LaVerkin <br />Springs, Littlefield Springs, and Las Ve~s Wash. <br /> <br />III. GENERAL DESCRIPTION OF THE STUDY UNIT <br /> <br />Physical <br /> <br />Loca tion <br /> <br />The Virgin River Unit, a part of the Colorado River Basin, comprises <br />an area of 19,554 square miles in southwestern Utah, northwestern Arizona, <br />and southern Nevada. Of the total area, 12,381 square miles lie in Nevada, <br />2,846 square miles in Utah, and 4,327 square miles in Arizona. The Virgin <br />River Unit as proposed in this report, consists of the pre-Lake Mead drain- <br />age and includes Muddy River and its principal tributaries, Meadow Valley <br />Wash and White River, and a small area immediately above the former con- <br />fluence of the Virgin with the Colorado River that now drains directly into <br />Lake Mead, It also inCludes Las Vegas Valley and the Lake Mead-Lower Colo- <br />radv River Valleys in Nevada, and the north rim of the Grand Canyon in <br />Arizona. Figure 1 shows the locations of the Subbasins, and Table 1 gives <br />the areas by State and Subbasin. <br /> <br />Table 1, Land Area by State and Subbasin, Virgin River Unit, Nevada, Utah <br />and Arizona <br /> <br /> Subbasin i Area by State - Square Miles Total I <br /> , Nevada , Arizona i Utah I <br />I Virgin River I , i <br />! 1,834 I 2,002 , 2,846 6,682 i <br />Muddy River i 1,757 I 0 0 1,757 <br /> ! , ; <br /> White River 2,769 , 0 ; 0 2 769 <br /> ; <br /> <br />Meadow Valley Wash I 2,386 0 , 0 2,386 <br />, <br />Las Vegas Valley I 2,113 i 0 i 0 2,113 I <br />Grand Canyon I 97 ! 2,325 I 0 2,422 J <br /> i i I 1 <br />Lake Mead-Lower Colo. 1,425 0 I 0 1,425 <br /> i <br />Total 12 , 381 4,327 2,846 i 19,554 <br /> I <br /> <br />The Virgin River proper, draining an area of about 6,682 square miles, <br />rises in the Pine Valley Mountains and Kolob Plateau in southwestern Utah <br />at elevations approaching 10,000 feet, flows southwesterly across the <br />northwestern corner of Arizona and empties into Lake Mead in Clark County, <br />Nevada, at an elevation of about 1,200 feet. <br /> <br />Muddy River comprises about 1,757 square miles, wholly within Nevada. <br />Muddy River proper rises from springs in upper Moapa Valley and flows <br /> <br />3 <br />