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. In the upper Green River Basin the mean annual temperature is about 37 degrees. The average midsummer maximum is about 86 degrees and the minimum is around 490 F. The average midwinter maximum is about 280 F and the average minimum, ranges from -60 to 220 F in the higher elevations. The average annual precipitation is about 10.4 inches. The average snowfall is about 60 inches, equivalent to about 60 percent of the precipitation of the basin [1]. The Yampa and White River Basins the mean annual temperature is about 420 F. The average midsummer maximum is 850 F and the minimum 450 F; the average midwinter maximum is about 330 F and the minimum is near 30 F. The average annual precipitation is 17.32 inches, and the snowfall ranges from about 43 to 215 inches. The average snowfall is equivalent to about 62 percent of the precipitation. In the Uinta Basin the mean average temperature is about 44.70 F. The average midsummer maximum is around 880 F and the minimum 530 F; the average midwinter maximum is around 300 F and the minimum is about 30 F. The average annual precipitation is about 11.71 inches, and the snowfall ranges from around 15 to 139 inches. In the lower Green River Basin the mean average temperature is about 480 F. The average midsummer maximum is 900 F and the minimum is 520 F. The average midwinter maximum is in the mid-30's and the minimums are in the 70 to 80 F range. The annual precipitation is about 9.9 inches, and the annual snowfall is about 20 inches. Snowfall ranges from about 10 inches in the lowlands to 120 inches in the highest elevations. 2.4 2.4.1 Water Resources Historic Perspective Early white explorers to the basin made reference to the abundant spring runoff in the basin. These explorers were followed by engineers and surveys who mapped the basin. The historic hydrology of the basin displays high spring runoff and much smaller base flow during other months of the year. During the late 1800's and the early 1900's, agriculture became the force behind development and the use and measurement of water became a major concern [3]. To ensure that each area of the basin received a fair share of the water, gages were installed and compacts were .negotiated. The gage with the longest period of record for the Green River is located near Green River, Utah. Flow records at the Green River gage date back to 1894 and provide a good historical prospective on the hydrology of the basin [4]. Historically, approximately 37 percent of the mean annual runoff of the Green River originates in the upper Green River Basin above Bridgeport. About 25 percent of the flow of the Green River is contributed by the Yampa River above Maybell. About 12 percent of the Green River flow originates from the Duchesne River above My ton. About 9 percent originates in the White River above Meeker, and about 2 percent by the Price River above Helper. These major tributaries represent about 85 present of the total flow of the Green River. The rest of the flow of the Green River is classified as arising from smaller tributaries, many of which are ungaged [1] 2-3