2000-11-22_PERMIT FILE - M2000092

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28 Soil survey This unit is well suited to windbreaks and bluestem, and sideoats grama. The average annual environmental plantings. The risk of soil blowing can be production of air-dry vegetation is about 1,100 pounds reduced by cultivating only in the tree rows and by per acre. If the condition of the range deteriorates, leaving a strip of vegetation between the rows. blue grama, threeawn, pricklypear, and snakeweed Supplemental irrigation may be needed when planting increase. Range seeding is suitable if the range is in and during dry periods. Among the trees that are suitable poor condition. The main limitation for seeding is areas for planting are Chinese elm and Russian-olive. Among where cobbles are in the surface layer. the shrubs are honeysuckle and lilac. This unit is well suited to homesite development. This unit is well suited to homesite development. This map unit is in capability subclass Vie, Permeability is somewhat restrictive for septic tank nonirrigated. It is in Loamy Foothills range site. absorption fields. This limitation can be overcome by increasing the size of the absorption field. Revegetating 28—Lakehelen-Rock outcrop complex, 15 to 80 disturbed areas around construction sites as soon as percent slopes. This map unit is on mountains. The possible helps to control soil blowing. native vegetation is mainly conifers. Elevation is 8,000 to This map unit is in capability subclass Vie, 10,000 feet. The average annual precipitation is 20 to 25 nonirrigated. It is in Loamy Plains range site. inches, the average annual air temperature is 38 to 42 degrees F, and the average frost-free period is 40 to 60 27—Kim-Cascajo complex, 1 to 12 percent slopes. days. This map unit is on terraces. The native vegetation is This unit is about 60 percent Lakehelen fine sandy mainly grass. Elevation is 6,200 to 7,000 feet. The loam and 30 percent Rock outcrop. Lakehelen soils are average annual precipitation is 12 to 15 inches, the on ridgetops and mountainsides, and Rock outcrop is on average annual air temperature is 48 to 52 degrees F, upper side slopes and ridges. The components of this and the average frost-free period is 100 to 125 days. unit are so intricately intermingled that it was not This unit is about 55 percent Kim loam and about 35 practical to map them separately at the scale used. percent Cascajo sandy loam. The components of this Included in this unit is about 10 percent Leadville fine unit are so intricately intermingled that it was not sandy loam on foot slopes. practical to map them separately at the scale used. They The Lakehelen soil is moderately deep and well have no definite pattern of occurrence. drained. It formed in residuum derived dominantly from Included in this unit is about 10 percent Potts sandy sandstone. Typically, the surface is covered with a mat loam in depressional areas. of partially decomposed needles and twigs about 1 inch The Kim soil is deep and well drained. It formed in thick. The upper part of the surface layer is pinkish gray eoiian silt and fine sand. Typically, the surface layer is fine sandy loam about 4 inches thick, and the lower part brown loam about 9 inches thick. Below this to a depth is light reddish brown fine sandy loam about 8 inches of 60 inches or more is loam. The soil is moderately thick. The next layer is very cobbly sandy loam about 4 alkaline throughout. inches thick. The subsoil is extremely cobbly sandy clay Permeability of this Kim soil is moderate. Available loam about 12 inches thick. Sandstone is at a depth of water capacity is high. Effective rooting depth is 60 28 inches. The soil is slightly acid to a depth of 4 inches, inches or more. Runoff is medium to rapid, and the medium acid to a depth of 12 inches, and slightly acid hazard of water erosion is moderate to very high. below that depth. The Cascajo soil is deep and well drained. It formed in Permeability of the Lakehelen soil is moderate. coarse textured alluvium. Typically, the surface layer is Available water capacity is very low. Effective rooting pale brown gravelly sandy loam about 5 inches thick. depth is 20 to 40 inches. Runoff is rapid, and the hazard The next layer is gravelly loam about 6 inches thick. The of water erosion is very high. upper 9 inches of the substratum is very gravelly sandy Rock outcrop consists of long escarpments of loam, and the lower part to a depth of 60 inches or more sandstone. is very gravelly loamy sand. A layer that has a high This unit is used as woodland and for wildlife habitat content of calcium carbonate is in the substratum. The and recreation. soil is mildly alkaline to a depth of 5 inches and The potential plant community is mainly Douglas-fir moderately alkaline below that depth. and white fir and an understory of kinnikinnick, elk Permeability of this Cascajo soil is moderately rapid in sedge, nodding bromegrass, and snowberry. The the surface layer and rapid in the substratum. Available potential production of the native understory vegetation water capacity is low. Effective rooting depth is 60 in normal years is about 200 pounds of air-dry vegetation inches or more. Runoff is slow to medium, and the per acre. hazard of water erosion is slight. The Lakehelen soil is suited to limited production of This unit is used as rangeland. Douglas-fir. It can produce about 2,100 cubic feet or The potential plant community on this unit is mainly 6,200 board feet (International rule) of limber per acre blue grama, western wheatgrass, and junegrass. Other from a fully stocked stand of even-aged trees 120 years grasses that characterize the unit are big bluestem, little old.