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<br />>, <br /> <br />SETTING <br /> <br />Location <br /> <br />Virgin Valley Subevaluation Unit is in Lincoln and Clark counties <br />in Nevada, Mohave County in Arizona, and Washington County in Utah (see <br />Figure 1). This wit is about 75 miles long in a north-south direction <br />and has an area of 2,030 square miles. The area is served by Interstate <br />Highway 15 which parallels Virgin River in Nevada and Arizona. U.S. <br />Highway 91 is also within the study area. Moat services are available <br />in Mesquite, Nevada, and St. George, Utah. <br /> <br />Durina planning, Virgin Valley was determined to be a contributing <br />area of salts to Colorado River and was selected for study. A tributary, <br />Beaver Dam Wash, was not studied in detail. Streamflaw measurements <br />shaw minor salt contribution from Upper Beaver Dam Wash, where a treat- <br />ment program Would not significantly reduce salinity. <br /> <br />Figure 2 shaws land ownership within Virgin Valley Sub evaluation <br />Unit. USDA study objectives are for improvements on privately owned <br />lands only. Figure 3 shaws Virgin Valley privately ,owned irrigated area. <br />Environmental impacts other than those related to dawnstream water quality <br />and quantity will occur within the vicinity shown by this map. Such <br />impacts include increaaed surface water flow, diaturbance of wildWe <br />habitat due to additional agricultural activity. etc. <br /> <br />t <br /> <br />_ADA Ill'WI <br />I <br /> <br />L 1 nco 1 n Couftt, <br />Clark County <br /> <br /> <br />LESENlI <br /> <br />505 <br />lII11es <br /> <br />c:::::::J Public 0atII1n (managed by IUl) <br />~ State and Other Fedlra! <br />_ Private <br />"-" H)'drologic Boundary <br /> <br />Sell. <br /> <br />II <br /> <br /> <br />_ Il~hinlton County <br />Hnhave County <br /> <br />. <br /> <br />1ll.IIz- <br />. . <br /> <br />II ......... <br />. Littlef1ald <br /> <br />.. II <br /> <br />Figure 2 <br />LAND O1fflERSHIP <br /> <br />USDA.SCS <br /> <br />Virgin Valley Subevaluation Unit <br />Arizona. Nevada. Utah <br /> <br />C; 0 G ~,; 6 2 of the Virgin River Unit <br /> <br />Colorado River Basin Salinity Control Program <br /> <br />5 <br />