2008-03-03_PERMIT FILE - C2006085 ‎(13)‎

• Permit No: C2006085
• IBM Index Class Name: Permit File
• Doc Date: 3/3/2008
• Doc Name: NRCS Soil Descriptions
• Section_Exhibit Name: Exhibit I
• Media Type: D
• Archive: No

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Fremont County Area, Colorado
~ are shallow or moderately deep in some areas. These
soils are well drained to somewhat excessively drained.
They formed in residuum and colluvium derived from
gneiss and granitic rock. Slopes range from 35 to 80
percent. About 0.01 to 0.1 percent of the surface is
covered with boulders. The characteristics of the soils
are variable, but the surface layer is commonly brown
very bouldery sandy loam about 4 inches thick. The
substratum is extremely gravelly sandy loam about 3
inches thick. Partially weathered granodiorite bedrock is
at a depth of 7 inches. The soils are mildly alkaline.
They are underlain by soft and hard bedrock. Except in
areas on foot slopes, the soils are mostly
noncalcareous.
Permeability is moderately rapid in the Ustic
Torriorthents. Available water capacity is very low.
Effective rooting depth is 4 to 30 inches. Runoff is rapid
or very rapid, and the hazard of water erosion is high or
very high.
The Rock outcrop consists of gneiss and granite
bedrock. It occurs mostly as short vertical cliffs,
bouldery projections, and exposed surfaces. It is on
side slopes throughout the unit. Slopes range from 50
to 90 percent.
This unit is used as noncommercial woodland or for
wildlife habitat. Most areas are inaccessible by livestock
because of the slope, the Rock outcrop, and the
boulders on the surface.
The potential plant community is mainly sparse
pinyon and juniper and an understory of Scribner
needlegrass, blue grama, Indian ricegrass, and
mountainmahogany. If the condition of the understory
deteriorates, blue grama, walkingstick cholla, yucca,
and pricklypear increase. The potential production of
native understory vegetation in normal years is about
350 pounds of air-dry vegetation per acre. The density
of pinyon and juniper stands is variable.
Woodland products, such as firewood, fence posts,
Christmas trees, and pinyon nuts, are produced in
areas of this unit. The supply of these products is very
limited, however, and access is severely limited by the
slope and the bouldery, rough surface.
This unit is poorly suited to homesite development.
The main limitations are the slope and the depth to
bedrock.
The capability classification is Vlls, nonirrigated.
Ustic Torriorthents are in the Pinyon-Juniper woodland
site.
121-Ustic Torriorthents-Sedillo complex, 15 to 40
ercent slopes. These soils are on fan terrace edges
and hills. The steep terrace edges are formed by deep
dissection of the fan terraces by streams. The unit also
is on landslide deposits in an area between Canon City
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87
and Garden Park and is near Table Mountain in the
northeastern part of the survey area. Slopes range from
about 40 to 60 percent in a few landslide areas. The
native vegetation is mainly pinyon and juniper. Elevation
is 5,800 to 6,700 feet. The average annual precipitation
is 13 to 15 inches, the average annual air temperature
is 48 to 52 degrees F, and the average frost-free period
is 130 to 160 days.
This unit is about 70 percent Ustic Torriorthents and
20 percent Sedillo soil. The Ustic Torriorthents are on
the middle and lower side slopes, and the Sedillo soil is
on crests and the upper side slopes of terrace edges.
Soils that are similar to the Sedillo soil but are mainly
sand, gravel, and cobbles are on the crests. At the
higher elevations are soils that are similar to the Ustic
Torriorthents but have a clayey subsoil and a somewhat
thicker dark surface layer.
Included with these soils in mapping are areas of
Wiley soils on fan terraces and foot slopes. Wiley soils
are not gravelly. They make up about 5 percent of the
unit. Areas of the deep Shanta soils are in
drainageways. Shanta soils have a thick, dark surface
layer and a low content of gravel. They make up about
5 percent of the unit. Also included are areas of soils
that have a high content of gypsum. These areas are
on the lower ridges, within one-half mile of State
Highway 115, in sec. 26, T. 17 S., R. 68 W.
The Ustic Torriorthents are shallow to deep and are
well drained. They formed in residuum and colluvium
derived dominantly from thinly bedded sandstone,
siltstone, and shale. Slopes range from 15 to 40
percent. The soils are covered by a thin mantle of
cobbly alluvium and colluvium. The texture of the
underlying material is variable, but it ranges from very
fine sandy loam to silty clay.
The characteristics of the Ustic Torriorthents are
variable, but in the deeper areas the surface layer is
typically dark grayish brown very gravelly loam about 2
inches thick. The upper 25 inches of the substratum is
gravelly clay loam. The lower part to a depth of 42
inches is gravelly loam. Weathered sandstone is at a
depth of about 42 inches. The soils are neutral to a
depth of 2 inches. They are mildly alkaline to a depth of
10 inches and are moderately alkaline below that depth.
At elevations above about 6,500 feet, the subsoil
commonly has additional clay leached downward from
the surface layer.
Permeability is moderate or slow in the Ustic
Torriorthents. Available water capacity is low or very
low. Effective rooting depth is 15 to 60 inches. Runoff is
rapid or very rapid, and the hazard of water erosion is
high or very high.
The Sedillo soil is deep and well drained. It formed in
gravelly and cobbly alluvium derived dominantly from