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~~ t <br />=~ ~ _ <br />a _c. _' <br />~ ~. <br />--~-~- ~` River -has eroded des hi hl scenic,: can ons in its <br />P~ g Y y passage <br />- __-- - - _ <br />t3~rvugh the Units Mountains. The Flaming Gorge Dam is located in <br />- ose of these canyons, its reservoir when filled will extend upstream <br />~orr~ 9i miles, to within five miles of Green River City. <br />The climate of the Green River drainage is often severe, with <br />sudden fluctuations. Temperatures in the study area range fxom <br />^~~---"_~~~'f ta=X100°F. ,• annual- precipitation in-the head water areas <br />N- -- ~-about 18 inches, but the desert area receives only about eight <br />inches a year. <br />Because of the variety of geological formations in the water- <br />shed,. water of very different qualities is found in the various tribu- <br />ta-ries, In general,. the waters coming from the Wind River Moun- <br />twins are low in dissolved minerals and carry little silt. The <br />streams-coming from the more westernly Wyoming Range are <br />- __ richer in dissolved minerals and contribute occasional heavy silt <br />loads. The Green River picks up considerable silt and alkaline <br />water from tributaries in the desert area and from tributaries <br />flowing across the desert from the Units Mountains, <br />A considerable sheep and cattle ranching industry is located <br />within the drainage. Summer irrigation, associated with livestock <br />and agricultural activities in the upper basin, often causes sudden <br />fluctuations in the chemistry of the river water. <br />1I <br />Considerable domestic and oil-field pollution was reported in <br />