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JEFFERSON FLATS This iste is located about one mile North of Jefferson, Co. The site is nearly level with the elope peecent less than 2~. The area has been used as native grazing land for many years. Soils The soils unit mapped at the Jefferson Flat site is 22D, This mapping unit consits of shallow, dark, loamy soils, They are gravelly and cobbly on the surface and throughout the profile. These soils occur on gently sloping to strongly sloping slopes. They have developed on gravelly and cobbly outwash materials. They take water well, but have a limited water holding capacity because of the high content of gravel and cobble. The elevation ranges from 9,000 to 10,400 feet. The annual precipitation ranges from 12 to 17 inches. Native vegetation occuring on this iste consists of Arizona fescue, Western Wheatgrass, blue grams, Junegrass, mountain and slimstem muhly, fringe sage and other forbs. This soil occurs on gently sloping to steep topography. It is an inclusion in the Mountain Outwash range site. At the type location this soil is on a 2 percent slope facing southeast. Elevation is aprroximately 9975 feet. Al 0-4" Dark brown (7.SYR 3(2) moist, sand loam; moderate fine granular structure; soft, very friable; contains scattered gravels; clear smooth boundary. AC 4-11" Dark brown(7.SYR 3/4 ), moist, sandy loam; moderate fine granular structure; this layer contains 15 to 20 percent gravels; soft, very friable; gradual and smooth boundary. C 11"+ Brown (7.SYR 4/3) moist, cobbly loamy sand; this layer contains 60 to 70 percent gravel, cobble, and stones. Climatic Information Annual precipitation averages between 12 and 16 inches. Pfinimal winter snow cover results in low available moisture for spring and early summer growth of cool season plants. Rains during late July and August appear normal for the Montane climatic zone. Optimum growing season for native plants is 70 to 90days with a mean annual temperature of 37 to 40 degrees F.