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Consumptiv~ Uses and Losses 3 gilsonite, asphalt, and trona (soda ash). Mineral production is the predominant Thermal electric power production is industry. This area is the Nation's chief . 0 becoming an; increasingly important source of molybdenum and is a major, 'J ("') industry, source of vanadium, uranium, lead, zinc, W coal, and gilsonite. On the Upper Main ~ Agriculture ranks near mineral, produc. Stem reporting area, as in that of the c.o tion in importance to the local economy. Green River,. agriculture centers around N Agricultural; development is centered production of livestock which feeds on around lives~k production, primarily irrigated lands to complement the large beef cattle an;d sheep. Because of a areas. of rangeland. Somewhat more short growing season, crop production is diversification of crops occur in the limited largely to small grain, hay, and Upper Main Stem, however, with some pasture. Th!lse crops are used as winter major land areas devoted to corn, beans, livestock feed and complement the vast potatoes, table vegetables, and fruit. areas of pubJic grazing lands. This diversification is made possible by climatic and topographic conditions that Irrigation consumptive use accounts for create favorable air drainage and about 75 percent of the total water use minimize frost damage. in the Green River reporting area exclusive of any share of main stem Irrigation consumptive use accounts for evaporation, Nearly 580,000 acres of about 58 percent of the water use in the land are irrigated in an average year. Upper Main Stem reporting area Large exports of water are made to the exclusive of any share of main stem ..;t. Great Basin in Utah. evaporation. In an average year about 555,000 acres of land are irrigated. Upper Main Stem, A considerable amount (29 percent) of Colorado-Utah water is exported to serve agricultural and municipal needs on the eastern The Upper Main Stem reporting area is slope of the Continental Divide in drained by the Colorado River and its Colorado. tributaries above the mouth of the Green Riveri Principal tributaries are San Juan-Colorado, the Roaring :Fork, Gunnison, and the Dolores Rivers. The Upper Main Stem Colorado-New Mexlco-Utah- reporting area consists of 26,200 square Arizona miles, with $bout 85 percent of the area in Colorado Bnd the remainder in Utah. The San Juan reporting area is drained Grand Junction, Montrose, and by the Colorado River and its tributaries below the mouth of the Green River and Glenwood Springs are the principal above Lee Ferry, Arizona. The largest towns in the Colorado portion of the of the tributary stream is the San Juan upper main .stem of the Colorado River. River which heads on the western slope Moab is the :only major community ill of the Continental Divide in south- the Utah portion of the upper main stem western Colorado. Principal tributaries of the Colorado River. of the San Juan River are the Navajo,