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<br />S
<br />'• :~..
<br />Permeability is moderate. The effective rooting depth
<br />is 60 inches or more. The available water capacity is
<br />moderate. Surface runoff is rapid, and the erosion
<br />hazard is high.
<br />Most of the acreage is rangeland (fig. 15). Part of It is
<br />used for recreation and wildlife. The cold climate and
<br />short growing season limit the production of introduced
<br />grasses and preclude the use of this soil as cropland.
<br />The rangeland vegetation is dominantly bluebunch
<br />wheatgrass, Idaho fescue, big sagebrush, and bitter-
<br />brush. As range condition deteriorates, big sagebrush
<br />becomes dominant.
<br />Deferred grazing end grazing management are needed
<br />to maintain or improve range condition. The soil is too
<br />stony and the slopes are too steep to be seeded with a
<br />drill (fig. 16). Brush control can improve range condition
<br />H big sagebrush becomes dominant.
<br />This soil provides spring and fall transition range for
<br />mute deer and elk. Other wildlife include sage grouse,
<br />coriontail, jackrabbit, and coyote. Livestock grazing man-
<br />agement and sagebrush control are necessary to protect
<br />big game range.
<br />Steep slopes and large stones are the soil properties
<br />.most limiting to community development. Road design
<br />'could provide drainage outlets for surface runoff. Cut
<br />l_ and fill slopes should be designed to minimize soil slip-
<br />page.
<br />The capability subclass is Vlls.
<br />67-Rock outcrop-Cryoboralis comple very
<br />steep. This steep to very steep unit is on mou insides,
<br />ridges, and escarpments at elevations of 8,5 to 11,400
<br />feet. It occur throughout the survey area. a average
<br />annual precip' ion ranges from 15 to inches, the
<br />average annual ~ temperature is 32 t 8 degrees F,
<br />and the frost•free ason is 20 to 65 d
<br />This unit is 50 to percent Roc utcrop and 25 to
<br />30 percent Cryobora Included i apping are small
<br />areas o1 Cryorthents an ryobor
<br />• The Rock outcrop is d b ock of various parent
<br />material, including granite, tone, shale, mudstone,
<br />and basalt.
<br />Cryoboralis are shallow erately deep over rock.
<br />'They are well drained ar ommonly loamy and
<br />stony. Some soils hav thin la 1 organic material
<br />over a light colored dace layer.. a subsoil is well
<br />developed sandy cl loam to clay.' depth to bed-
<br />rock ranges from to 40 inches. R ion is slightly
<br />acid to acid.
<br />Surface run is moderate to high. The ion hazard
<br />is high.
<br />This uni used as wildlife habitat.
<br />Thep ential native vegetation is lodgepole e, En-
<br />,elma spruce, subalpine fir, and a sparse u rstory
<br />of gr es, shrubs, and fortis.
<br />Thi unit has severe limitations for all develo ant.
<br />The capability subclass is Vllts.
<br />SOIL SURVEY
<br />68-Rock outcrop-Cryoborolls complex, extremely
<br />steep. This steep to extremely steep unit is on moun-
<br />tainsides, ridges, and escarpments at elevations of 8,000
<br />to 10,500 feel. It occurs throughout the survey area. The
<br />average annual precipitation is 14 to 28 inches, the aver-
<br />age annual air temperature ranges from 32 to 38 de•
<br />grees F, and the frost-free season is 20 to 65 days.
<br />This unit is 60 to 70 percent Rock outcrop and 20 to
<br />30 percent Cryoborolls. Included in mapping are small
<br />areas o1 Cryoboralis.
<br />The Rock outcrop is hard bedrock o1 various parent
<br />material, including granite, sandstone, mudstone, and
<br />basalt.
<br />Cryoborolls are shallow to moderately deep over rock.
<br />They are well drained and are usually loamy and stony.
<br />The surtace layer is dark colored. In some pedons the
<br />subsoil is clay loam. The depth to bedrock ranges from
<br />10 to 40 inches. Reaction is slightly acid to neutral.
<br />Surface runoff is rapid. The erosion hazard is high.
<br />This unit is used as wildlife habitat.
<br />Potential native vegetation includes big sagebrush,
<br />bluebunch and slender wheatgrass, and rabbitbrush.
<br />This unit has severe limitations for all development.
<br />The capability subclass is Vllls.
<br />69-Rock outcrop•Haploborolls complex, extreme-
<br />ly steep. This steep to extremely steep unit ' moun-
<br />tainsides, ridges, and escarpments at elev ns of 6,400
<br />to 7,800 et. It occurs in the southwe n part of the
<br />survey are near Radium. The averag nnual precipita•
<br />lion ranges m 11 to 14 inches, the erage annual air
<br />temperature 37 to 45 degrees and the frost-tree
<br />season is 60 110 days.
<br />This unit is to 60 percent k outcrop and 15 to
<br />25 percent Ha borolls. Includ in mapping are small
<br />areas of Torriort nts.
<br />The Rock out op is hard edrock of various parent
<br />material, includin ranite, s stone, and basalt.
<br />Haploborolls a shallo to moderately deep over
<br />rock. They are we rain and are commmonly loamy
<br />end stony. In plac th urface layer is dark colored.
<br />The subsoil in so p ons is weakly developed clay'
<br />loam. The depth t Brock ranges from 10 to 40
<br />inches. Reaction ism y alkaline to slightlyy acid.
<br />Surtace runoff is 'd. The erosion hazard is high.
<br />This unit is used life habitat.
<br />The potential n e elation is pinyon pine, Rocky
<br />Mountain juniper, nd bi agebrush, and a sparse un-
<br />derstory of gras sand fo
<br />This unit ha severe li lions for all development.
<br />The ca~abi' subclass is Ifs.
<br />70-Ro gravelly sand oam, 15 to 60 percent
<br />slopes. is shallow, well drat d, moderately steep to
<br />very s p soil is on mountain r es and side slopes at
<br />elev ions of 7,500 to 9,000 tee 11 formed in residuum
<br />from granite or gneiss. The avers annual precipitation
<br />
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