HomeMy WebLinkAbout20011796.tiff SOIL SURVEY
8
i�
r the leachate. Sewage lagoons require sealing. 60 percent of the unit. Aquents. 5
which have a lighter
Lawns, shrubs, and trees grow well. Capability subclass per
cent colored surface
fac e and Bankard make
up about ou lope cent. About iAq sIts irrigated.
2—Altvan loam. 1 to 3 percent slopes. This is a deep, These are deep. poorly drained socal.that
Comm Commonly formed
well drained soil on terraces at elevations of 4.500 to 4,900 recent alluvium. No one pedon is typi
feet. It formed in old alluvium deposited by the major soils have a mottled, mildly alkaline to moderately al-
rivers. Included in mapping are small areas of soils that kaline loamy or clayey surface layer and underlying
show evidence of poor drainage. Also included are small, material and are underlain by sand or sand and gravel
long and narrow areas of sand and gravel deposits. within 48 inches. In places they have a gleyed layer in the
Typically the surface layer of this Altvan soil is grayish underlying material.
brown loam about 10 inches thick. The subsoil is brown Most of the acreage is subject to flooding. The water
and light yellowish brown clay loam and sandy clay loam table is at or near the surface early in spring and recedes
about 14 inches thick. The substratum is calcareous loamy to as deep as 48 inches late in fall in some years.
sand about 5 inches thick over gravelly sand. These soils are used for rangeland and wildlife habitat.
Permeability and available water capacity are Some small areas have been reclaimed by major drainage
moderate. The effective rooting depth is 20 to 40 inches. and leveling and are used for irrigated crops.
Surface runoff is medium, and the erosion hazard is low.
The potential native vegetation is dominated by alkali
This soil is used almost entirely for irrigated crops. It sacaton, switchgrass, and western wheatgrass. Saltgrass,
is suited to all crops commonly grown in the area, includ- sedge. rush, and alkali bluegrass are also prominent.
ing corn, sugar beets, beans, alfalfa, small grain, potatoes, Potential production ranges from 3,000 pounds per acre in
and onions. An example of a suitable cropping system is 3 favorable years to °.000 pounds in unfavorable years. As
to 4 years of alfalfa followed by corn, corn for silage, range condition deteriorates, the switchgrass. alkali
sugar beets, small grain, or beans. Land leveling, ditch
sacaton. and western wheatgrass decrease and saltgrass.
lining, and installing pipelines may be needed for proper sedge, and rush increase.
water application. Management of vegetation should be based on taking
All methods of irrigation are suitable. but furrow ir- half and leaving half of the total annual production. Seed-
rigation is the most common. Barnyard manure and com- ing is difficult and costly because numerous tillage prac-
^erciai fertilizer are needed for top yields. tices are required to eliminate the saltgrass sod.
Windbreaks and environmental plantins of trees and Switchgrass, western wheatgrass, alkali sacacon, tall
shrubs commonly grown in the area are generally well wheatgrass, and tall fescue are suitable for seeding. They
suited to this soil. Cultivation to control competing can be seeded into a clean. firm seedbed. Seedbed
vegetation should be continued for as many years as preparation usually requires more than 1 year to
possible following planting. Trees that are best suited and eliminate the saltgrass sod. A grass drill should be used.
have good survival are e Mountain juniper, eastern Seeding early in spring has proven most successful.
redcedar. ponderosa pine, Siberian elm. Russian-olive. and Wetland wildlife, especially waterfowl, utilize this unit.
hackberry. The shrubs best suited are skunkbush sumac. The wetland plants provide nesting and protective cover.
lilac. Siberian peashrub, and American plum. as well as some food. The nearby irrigated cropland.
This soil can produce habitat elements that are highly where wildlife obtain much of their food and find protec-
tail,suitable for ooenland wildlife including pheasant, cotton- rive cover. makes this unit valuable to both wetland and
and mourning dove. Such crops as wheat, corn, and rive co d
alfalfa provide suitable habitat for openland wildlife, openllandand
wildlife.wildlife, especially pheasant, use this unit for
undiespesturbed
pheasant. Tree and l shrub plantings and cover and nesting. Deer find excellent cover in some
undisturbed nesting cover would enhance openland wil- areas
dlife populations. These valuable wildlife areas should be protected from
This reason soil has me . goochiefd limiting ial for urban fire and fenced to prevent encroachment and overuse by
and r recreational urban
n development. The the shrink-swell
nw soil fen- livestock. They should not be drained.
tares fore sun o as it w tare ries and
tth prapidn- These soils have good potential as a source of sand and ti permeability al the subsoil t as it ns and sus and me rapid ravel. Capability subclass VIw: Salt Meadow range site.
absorption
of the sand o gravel substratum. Septic e g 4—Aquolls and Aquepts. flooded. This nearly level
tank absorption fields function enough enoerly, but in places the map unit is in depressions in smooth plains and aiong the
substratum does not Sewage e ago fines itto psealing.
filter the leachate. lagoons require sealing. bottoms of natural drainageways throughout the survey
Lawns, shrubs. and trees grow well. Capability subclass area
upuo ls. 55 ich percent haveaoddark
coloredls surface os layer.
h
He irrigated.
3—Aquolls and Aquen[s. gravelly substratum. This have a lighter colored surface layer, make up about 25
nearly .e,..el map unit :s on bottom lands and flood piains percent. About 20 percent is soils that are '.veil ,trained
of ail the major streams :n the survey area. Agnoiis. and soils that have sandstone or shale ..cith:n 4` :ncces of
which :lave a aark -'oiereli surface :aver. make up about the surface. EXHIBIT
2001-17961 Alp_
WELD COUNTY, COLORADO. SOUTHERN PART 29
/wave good survival are Rocky Mountain juniper, eastern The potential native vegetation is dominated by
:dcedar, ponderosa pine. Siberian elm. Russian-olive, and western wheatgrass and blue grama. Buffalograss is also
hackberry. The shrubs best suited are skunkbush sumac, present. Potential production ranges from 1.000 pounds
lilac, Siberian peashrub, and American plum. per acre in favorable years to 600 pounds in unfavorable
Wildlife is an important secondary use of this soil. The years. As range condition deteriorates, a blue grama-buf-
cropland areas provide favorable habitat for ring-necked falograss sod forms. Undesirable weeds and annuals in-
pheasant and mourning dove. Many nongame species can vade the site as range condition becomes poorer.
be attracted by establishing areas for nesting and escape Management of vegetation of this soil should be based
cover. For pheasants, undisturbed nesting cover is essen- on taking half and leaving half of the total annual produc-
tial and should be included in plans for habitat develop- don. Range pitting can help in reducing runoff. Seeding is
ment, especially in areas of intensive agriculture. desirable if the range is in g poor condition. Western
This soil has fair to poor potential for urban develop- wheatgrass, blue grama. sideoats grama, buffalograss, pu-
ment. It has moderate to high shrink swell, low strength, bescent wheatgrass, and crested wheatgrass are suitable
and moderately slow permeability. These features create for seeding. The grass selected should meet the seasonal
problems in dwelling and road construction. Those areas requirements of livestock. It can be seeded into a clean.
that have loam or sandy loam in the lower part of the firm sorghum stubble, or it can be drilled into a firm
substratum are suitable for septic tank absorption fields prepared seedbed. Seeding early in spring has proven
and foundations. Some areas of this soil are adjacent to most successful.
streams and are subject to occasional flooding. The poten- Windbreaks and environmental plantings are generally
tial is fair for such recreational development as camp and well suited to this soil. Cultivation to control competing
picnic areas and playgrounds. Capability class I irrigated. vegetation should be continued for as many years as
42—Nunn clay loam. 1 to 3 percent slopes. This is a possible following planting. Trees that are best suited and
deep, well drained soil on terraces and smooth plains at have good survival are Rocky Mountain juniper. eastern
elevations of 4.550 to 5,150 feet. It formed in mixed allu- redcedar, ponderosa pine, Siberian elm, Russian-olive, and
vium and eolian deposits. Included in mapping are small, hackberry. The shrubs best suited are skunkbush sumac.
long and narrow areas of sand and gravel deposits and lilac, Siberian peashrub. and American plum.
small areas of soils that are subject to occasional flooding. Wildlife is an important secondary use of this soil. The
Some leveled areas are also included. cropland areas provide favorable habitat for ring-necked
' Typically the surface layer of this Nunn soil is grayish pheasant and mourning dove. Many nongame species can
.rown clay loam aobut 9 inches thick. The subsoil is light be attracted by establishing areas for nesting and escape
brownish gray clay loam about 14 inches thick. The upper cover. For pheasants, undisturbed nesting cover is essen-
part of the substratum is light brownish gray clay loam. tial and should be included in plans for habitat develop-
The lower part to a depth of 60 inches is brown sandy ment, especially in areas of intensive agriculture. Range-
loam• land wildlife, for example, the pronghorn antelope, can be
Permeability is moderately slow. Available water attracted by developing livestock watering facilities.
capacity is high. The effective rooting depth is 60 inches managing livestock grazing, and reseeding where needed.
or more. Surface runoff is medium, and the erosion This soil has fair to poor potential for urban develop-
hazard is low. ment. It has moderate to high shrink swell, low strength,
In irrigated areas this soil is suited to all crops corn- and moderately slow permeability. These features create
monly grown in the area, including corn, sugar beets, problems in dwelling and road construction. Those areas
beans, alfalfa, small grain, potatoes, and onions. An exam- that have loam or sandy loam in the lower part of the
ple of a suitable cropping system is 3 to 4 years of alfalfa substratum are suitable for septic tank absorption fields
followed by corn, corn for silage, sugar beets, small grain, and foundations. Some areas of this soil are adjacent to
or beans. Generally such characteristics as the high clay streams and are subject to occasional flooding. The poten-
content or the rapidly permeable substratum slightly tial is fair for such recreational development as camp and
restrict some crops. picnic areas and playgrounds. Capability subclass Ile ir-
All methods of irrigation are suitable, but furrow ir- rigated, IIIc nonirrigated; Clayey Plains range site.
rigation is the most common. Proper irrigation water 43—Nunn loamy sand, 0 to 1 percent slopes. This is a
management is essential. Barnyard manure and commer- deep, well drained soil on terraces at elevations of 4,700
cial fertilizer are needed for top yields. to 4,900 feet. It formed in alluvium along Box Elder
In nonirrigated areas most of the acreage is in small Creek. Included in mapping are small areas of soils that
grain and it is summer fallowed in alternate years. have a loamy subsoil and small areas of soils that are sub-
Winter wheat is the principal crop. The predicted average ject to rare flooding.
yield is 33 bushels per acre. If the crop is winterkilled, Typically the surface layer of this Nunn soil is brown
spring wheat can be seeded. Generally precipitation is too loamy sand overburden about 9 inches thick. The subsoil
mow for beneficial use of fertilizer. is dark to very dark grayish brown clay loam about 21
Stubble mulch farming, striperopping, and minimum til- inches thick. The substratum to a depth of 60 inches is
sage are needed to control soil blowing and water erosion. loamy very fine sand, loamy sand, or sand.
Hello