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and income in rural areas. Many residents are self-employed in recreation-related businesses, and the remainder are involved pri- marily in construction, mining, and government work (Reference 3). The Summit County climate is characterized by cold winters, mild sum- mers, and wide daily variations in temperature during both these seasons. Most precipitation occurs in winter in the form of dry, powdery snow. Summer precipitation occurs in the form of brief, localized thunderstorms. . Large temperature ranges are observed at Dillon, where the monthly average varies from 15.50~ in January to 550F in July. The mean maximum temperature varies from 32.20F in January to 74.90F in July, and the mean minimum temperature varies from -1.40F in January to 36.10F in July. The difference between the average maximum and minimum temperatures is 340F in January and 390F in July, which is indicative of the daily temperature range. ~ Average annual precipitation varies considerably over the county. Measurements (excluding snowfall) are 15.46 inches at Green Mountain Reservoir, 17.01 inches east of Dillon, and 19.33 inches at Brecken- ridge. Estimates of mountain precipitation are as high as 50 inches annually for a section of the Gore Range. Average snowfall measurements range from 89 inches per year at Green Mountain Reservoir to 159 inches at Breckenridge. A few large snow- storms account for most of the average snowfall (Reference 3). The major soil types along the streams in Summit County are the Cryaquolls, Cryoborolls-ROck Outcrop Association, and Cryoboralfs- ROck Outcrop Association. Cryaquolls occupy high mountain-meadow areas on flood plains, low terraces, and fans. These deep, dark- colored, poorly drained, loamy soils are formed in mixed alluvium and are found primarily along Tenmile Creek, Meadow Creek, and Blue River and its tributaries. Depth to the seasonal high water table varies from 0.0 to 1.5 feet. The native vegetation is mostly sedge, rush, and tufted hairgrass, with willows near the streams. , The Cryoborolls-Rock Outcrop Association is found adjacent to the Cryaquolls along much of the Blue River and its tributaries. These moderately deep to deep, dark-colored, well-drained, loamy soils occupy subalpine mountain slopes, mesas, upland benches, and old high terraces and fans. The soils are formed in glacial till and outwash, weathered sandstone, shale, disintegrated granite, and stony and cobbly, coarse-textured alluvium. Native vegetation over these soils is a sparse cover of muttongrass, western wheatgrass, pine needlegrass, and sagebrush. . The CryoboralfS-Rock Outcrop Association is the most extensive in the state and occurs in a major portion of the high mountainous areas. In Summit County, this association occurs on the upland areas and 5