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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />flr2f~9;7 <br />'.I U .. u,~ <br /> <br />The salt desert shrub community includes shadscale, sagebrush, <br />horsebush, spiny hopsage, nuttall saltbush, greasewood, rabbitbrush <br />and summercypress. Some grasses found in this community are salt- <br />grass, alkali sacaton, sandberg bluegrass, and Indian ricegrass (2). <br /> <br />The greasewood stand type grows commonly on benches above <br />permanent streams, Other shrubs found in this stand include sage- <br />brush, rabbitbrush, and shadscale. The same type of grasses are <br />found in this community as in the salt desert shrub community. These <br />latter two communities are common in the large desert province around <br />Rangely. Distinctive vegetation in addition to those listed above are <br />Mat and Gardner saltbush, bud sagebrush, galleta grass, western wheat- <br />grass, and squirreltail (2). <br /> <br />E. Soil s <br /> <br />Similar soils are found at the dam site and in the irrigable <br />service area, The soils in the irrigable service area were classified <br />by the Soil Conservation Service (SCS) of the United States Department <br />of Agriculture (USDA) in Soil Mawing Unit 1 in a 1965 report (2). The <br />soils in the reservoir area were classified by the SCS in Soil Mapping <br />Unit 2 of the same report, <br /> <br />Soils of Unit 1 have formed under a low effective annual precipita- <br />tion that varies from 8 to 12 inches. Elevations range from 5200 to <br />6200 feet. The mean annual temperature is about 470F and the frost- <br />free period at Rangely, representative of the area, is 124 days (2). <br /> <br />Soil parent materials are mainly calcareous, clayey shales and <br />sandstones. Sandy and gravelly outwash, wind-blown sands and silts, <br />and alluvial sediments are also extensive (2). <br /> <br />II-7 <br /> <br />j '. <br /> <br />b_-_~ <br />