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Soils Information Elevation ranges from 7840 to 8040 feet. The average annual precipitation is 1 l to 16 indtes, average annual soil temperature is 46 degrees Fahrenheit, and average soil temperature in summer is 64 degrees Fahrenheit. The frost-free season is 75 to 100 days. Mwe precise climate data is included in Exhibit K. Gravelly Alluvial Land - Gv: A gently sloping to sloping mapping unit that consists of highly stratified deposits of granitic gravel and sand. It is on fans end toe slopes along the Arkansas River. The fans end slopes are associated mainly with the granitic rock outcrops. There is little fine soil material. The surface is covered with cobble and gravel in places, and in some areas there ere scattered stones. The fans and toe slopes are subject to periodic deposition. There is little or no plant cover. Where plants are present, they ere mostly weeds, rabbitbrush, and traces of grass. This land is not suitable for range, because of the sparse, variable plant cover. Rockland - RcF: Rock land, 15 to 60 degree slopes, is a land type that occurs along the eastern edge of the survey area from Salida to Riverside. It is associated with rack outcrop. Rock land is 50 to 90 patent outcrops of rock and 10 to 50 percent very shallow soils. Shallowness is the most important soil characteristic. The exposed rock consists of Pike's Peak granite with gneiss and schist, Silver Plume granite with gneiss and schist, trachyte, perlite and dibase. These are low sediment-producing materials. Access to this land type is limited by the topography. The plant cover is sparse; it is mainly scrubby pinyon pine and such grasses es blue grams, mountain mutely, and Indian ricegrass. Surface natoff is rapid, but the hazard of erosion is only moderate. The available water capacity is low. The mapping unit is used for watershed, wildlife habitat and very limited gazing. Rock Outcrop - Ro: Rack Outcrop is a steep and very steep land type that occurs throughout the survey area. Bare bedrock makes up 90 patent or more of the mapping unit, end there are many sheer bluffs, nags and talus slides. Lack of roads and rough topography make accessibility difficult. Most of the geological material in this land type is Pike's Peak granite with gneiss and schist, Silver Plume granite with gneiss and sdtisl, trachyte, polite and dibase. These are very low sediment-producing materiels. The plant cover is very sparse. A few pinyon pines end other conifers grow in the crevices and cracks where fan materials and moisture accumulate. Rock outcrop is used for wildlife habitat, recreation and watershed. Ouray gravelly loam - OuB: Thick surface vaziant, 1 to 3 patent slopes. This soil is on terraces that parallel the main river and streams in the central and northern parts of Chaffee County, generelly east of the Arkansas River. Included with this soil in mapping are smell arras of Dominson gravelly sandy loam, 1 to 9 percent slopes. Southwest of Salida and southeast of Buena Vista, these are areas of included soils that are less than 40 inches deep over cobbles and gravel and aze slightly calcareous within 12 inches of the surface. Also included are small areas of Ouray soils that have a surface layer of gravelly sandy loam. Runoff is slow on this soil, and the hazard of erosion is slight. Most of the acreage is irrigated and used for crops, mainly alfalfa hay, potatoes and small grains. The preceding soil analysis was take[ from "Soil Survey of Chaffee-Lake area, Colorado. United States Department of Agriculture. Sheet Number 20, an aerial photo with the land types mapped is attached for reference.