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<br />and income in rural areas. Many residents are self-employed in <br />recreation-related businesses, and the remainder are involved pri- <br />marily in construction, mining, and government work (Reference 3). <br /> <br />The summit County climate is characterized by cold winters, mild sum- <br />mers, and wide daily variations in temperature during both these <br />seasons. Most precipitation occurs in winter in the form of dry, <br />powdery snow. Summer precipitation occurs in the form of brief, <br />localized thunderstorms. <br /> <br />Large temperature ranges are observed at Dillon, where the monthly <br />average varies from IS.SoP in January to Ssop in July. The mean <br />maximum temperature varies from 32.20F in January to 74.90P in July, <br />and the mean minimum temperature varies from -1.40P in January to <br />36.1oF in July. The difference between the average maximum and <br />minimum temperatures is 340F in January and 390P in ,July, which is <br />indicative of the daily temperature range. <br /> <br />Average annual precipitation varies considerably over the county. <br />Measurements (excluding snowfall) are 15.46 inches at Green Mountain <br />Reservoir, 17.01 inches east of DilloD, and 19.33 inches at Brecken- <br />ridge. Estimates of mountain precipitation are as high as 50 inches <br />annually for a section of the Gore Range. <br /> <br />Average snowfall measurements range from 89 inches per year at Green <br />Mountain Reservoir to 159 inches at Breckenridge. A few large snow- <br />storms account for most of the average snowfall (Reference 3). <br /> <br />The major soil types along the streams in Summit County are the <br />Cryaquolls, Cryoborolls-Rock Outcrop Association, and Cryoboralfs- <br />Rock Outcrop Association. Cryaquolls occupy high mountain-meadow <br />areas on flood plains, low terraces, and fans. These deep, dark- <br />colored, poorly drained, loamy soils are formed in mixed alluvium <br />and are found primarily along Tenrnile Creek, Meadow Creek, and Blue <br />River and its tributaries. Depth to the seasonal high water table <br />varies from 0.0 to 1.5 feet. The native vegetation is mostly sedge, <br />rush, and tufted hairgrass, with willows near the streams. <br /> <br />The Cryoborolls-Rock Outcrop Association is found adjacent to the <br />Cryaquolls along much of the Blue River and its tributaries. These <br />moderately deep to deep, dark-colored, well-drained, loamy soils <br />occupy subalpine mountain slopes, mesas, upland benches, and old <br />high terraces and fans. The soils are formed in glacial till and <br />outwash, weathered sandstone, shale, disintegrated granite, and <br />stony and cObbly, coarse-textured alluvium. Native vegetation over <br />these soils is a sparse cover of muttongrass, western wheatgrass, <br />pine needlegrass, and sagebrush. <br /> <br />The Cryoboralfs-Rock Outcrop Association is the most extensive in the <br />state and occurs in a major portion of the high mountainous areas. <br />In Summit County, this association occurs on the upland areas and <br /> <br />5 <br />