Expert Report of D. Randolph Seahom and Exhibits

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• 6 Consumptive Uses and Losses Agriculture is concentrated along the main stem of the Little Colorado River in the upper reaches of the river, on Silver Creek, a southern tributary, and on the Zuni River in New Mexico. Current irrigated lands in the basin are estimated to average approximately 20,000 acres. Irrigated acreage in the basin is subject to variation because of frequent water shortages and inadequate storage facilities. Population is predominately rural with a relatively large Indian segment. Principal cities include Flagstaff, Winslow, and Holbrook in Arizona, and Gallup, Zuni, and Pueblo in New Mexico. Leading industries include tourism, recreation, manufacturing, mining, and forest management. Virgin River, Arizona - Nevada -Utah The Virgin River originates in western Kane County, Utah. It flows southwesterly through the southwest corner of Utah and the northwestern corner of Arizona and empties into the northern extremity of the Overton Arm of Lake Mead in Nevada. The selected outflow point is the long -term USGS gauging station at Littlefield, Arizona, which is about 36 miles upstream from Lake Mead and about 10 miles above the Arizona - Nevada State line. The river is fed chiefly from tributaries heading in the southern high plateaus and mountains in Utah. Several springs contribute water to the river at a relatively uniform rate. The two most significant of these springs are located near LaVerkin, Utah, and Littlefield, Arizona, and both are highly saline. Agricultural and municipal developments in Nevada below the selected outflow point are included in the "tributary area above Lake Mead ". The major irrigated areas are located in the LaVerkin- Hurricane -St. George -Santa Clara areas of Washington County, Utah, and in the Littlefield area of Mohave County, Arizona. Small irrigated areas are scattered throughout. Irrigated lands were estimated to average approximately 18,000 acres. Ground water has been developed to a limited degree. Population is predominately rural with St. George, Utah, being the principal city in the basin. Muddy River, Nevada The Muddy River, a tributary of the Virgin River prior to the existence of Lake Mead, originates from warm springs in northern Clark County, Nevada, about 10 miles northwest of Glendale. The river flows southeasterly about 30 miles and terminates at the northwestern extremity of the Overton Arm of Lake Mead near Overton, Nevada. Meadow Valley Wash, the major tributary of Muddy River, originates in northeastern Lincoln County and flows south to join the parent stream at Glendale. The USGS gauging station near Glendale is about 2.4 miles downstream from Meadow Valley Wash. The outflow varies little from year to year. Meadow Valley Wash, although perennial in the vicinity of Caliente, is normally dry in the last 50 -mile reach above Glendale. Irrigated lands averaged approximately 20,000 acres. The entire basin is sparsely populated. Bill Williams River, Arizona The Bill Williams River is formed by the mergence of the Big Sandy and Santa Maria Rivers about 7.5 miles above Alamo Dam. The river above Alamo Dam drains an area of about 4,700 square miles from small, rough mountain ranges and intervening valleys in parts of Mohave, La Paz, and Yavapai Counties. Alamo Dam and Reservoir, primarily a flood