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<br />DIRTY DEVIL RIVER <br />SALINITY CONTROL UNIT <br /> <br />INTRODUCTION <br /> <br />The Dirty Devil River Unit 1S located in southeastern central Utah. A general <br /> <br />location map of the project area is attached on page 2. The Dirty Devil River <br /> <br />is formed by the confluence of Muddy Creek and the Fremont River about two <br /> <br />miles northeast of Hanksville, Utah. The Unit includes the major tributaries <br /> <br />of Muddy Creek and Fremont River, and small drainages flowing directly into the <br /> <br />Dirty Devil River. The total area covers about 4,300 square miles and includes <br /> <br />portions of Sanpete, Sevier, Emery, Wayne, piute and Garfield Counties. Ap- <br /> <br />proximately 75 percent of the study area is Bureau of Land Management adminis- <br /> <br />tered land. The remaining area contains a large portion of Capitol Reef Na- <br /> <br />tional Park, a small section of Glen Canyon National Recreation Area, portions <br /> <br />of Fish Lake, Dixie, and Manti LaSal National Forests, and sections of State of <br /> <br />Utah and private land. Elevations range from about 3,600 feet at the mouth of <br /> <br />the Dirty Devil River to 11,500 feet in the mountain ranges at the head of the <br /> <br />drainage basins. <br /> <br />The unit area ~s generally high desert with an arid to semi-arid climate. Av- <br /> <br />erage annual rainfall is less than 10 inches, ranging from less than six inches <br /> <br />along the Dirty Devil River to more than 30 inches in the headwater areas above <br /> <br />10,000 feet. Temperatures range from over 1000F in the summer to lower than <br /> <br />-20oF in the winter. Snowfall 1S generally light at the lower elevations and <br /> <br />substantial amounts accumulate at the higher elevations. <br /> <br />002477 <br />