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USDA Soil Survey of Weld County, Colorado Southern Part
Sheet Number 20
Mill Creek PUD
pt. SW %4 29-04-G8
r
2412 Denby Court • Fort Collins, Colorado 80526 • (970) 207-0272 *fax(561) 828-8059
2002-1547
Todd Hodges Design, LLC
Soil Survey of Weld County, Colorado excerpt (Southern Portion)
Published by the United States Department of Agriculture
Soil Conservation Service
In Cooperation with Colorado Agricultural Experiment Station
issued September 1980
Soil Classification #4: Aquolls and Aquepts, flooded
4—Aquells and Aquepta, flooded. This nearly level
map unit is in depressions in smooth plains and along the
bottom' of natural drainageways throughout the survey
area. Aquolls, which have a dark colored surface layer,
make up about 55 percent of the unit. Aquepts, which
have a lighter colored surface layer, make up about 25
percent. About 20 percent is soils that are well drained
and soils that have sandstone or shale within 48 inches of
the surface.
These are deep, poorly drained soils that formed in
recent alluvium. No one pedon is typical. Commonly the
soils have a mottled, mildly to moderately alkaline loamy
or clayey surface layer and underlying material that ex-
tends to a depth of 80 inches or more.In places they have
a gleyed layer in the underlying material
Meet of the acreage is subject to excessive runoff. The
water table is at or near the surface in spring and during
the peak of the irrigation season.
These soils are used for rangeland and wildlife habitat.
Some small areas are irrigated pasture.
The potential native vegetation is dominated by
switchgreas, prairie cordgrass, saltgrass, alkali saeaton,
big bluestem, indiangres , western wheatgrssa, slender
wheatgrass, sedge, and rush. Cattails and buff ush grow
in the swampy spots associated with these range sites.
Potential production ranges from 4,000 pounds per acre in
favorable years to 3,000 pounds in unfavorable years. As
range condition deteriorates, the tall and mid grasses
decrease, production drops,and aaltgrasa,sedge,and rush
increase.The farming and irrigation in adjacent areas has
increased the amount of salts on much of the acreage.
Management of vegetation on this soil should be based
on taking half and leaving half of the total annual produc-
tion. Switehgrass, big hltnestem, indlangrass western
wheatgrass, pubescent wheatgrass, intermediate wheat-
grass, tall wheatgrass, and tall fescue are suitable for
seeding. The plants selected should met the seasonal
requirements of livestock. For successful seeding, a firm
prepared seedbed is needed. A grass drill should be used.
Seeding early in spring has proven moat suceeasflrl Til-
lage is needed to eliminate the undesirable vegetation_
Wetland wildlife, especially waterfowl, utilize this unit.
The wetland plants provide nesting and protective cover
as well as some food. The nearby irrigated cropland,
where wildlife obtain much of their food and find protec-
tive cover, makes this unit valuable to both wetland and
openland wildlife.
Openland wildlife,especially pheasant,use this unit for
cover and nesting. Deer find excellent cover in some
areas. These valuable wildlife areas mould be protected
from fire and fenced W prevent encroachment and
overuse by livestock. They should not be drained. Capa-
bility subclass Vlw; Aquolls in Salt Meadow range site,
Aquepts in Wet Meadow range site.
2412 Denby Court • Fort Collins, Colorado 80526 • (970) 207-0272 • fax: (561)828-8059
email: toddhodgesdesign(u earthlink.net
Todd Hodges Design, LLC
Soil Survey of Weld County, Colorado excerpt
Published by the United States Department of Agriculture
Soil Conservation Service
In Cooperation with Colorado Agricultural Experiment Station
Issued September 1980
Soil Classification #34: Kim loam, 5 to 9 percent slopes
34—Kim loam. S to 9 percent slopes. This is a deep,
well drained soil on plains and alluvial fans at elevations can be drilled into a fine prepared seedbed. Plowing and
of 4,900 to 5,250 feet. It formed in mixed collar! deposits
drilling on the contour minimize runoff and soil losses.
and parent sediment from a wide variety of bedrock. In-
Windbreaks early in spring has proven most successful.
eluded in mapping are small areas of soils that have Windbreak and environmental plantings are generally
loamy sand underlying material well suited to this soil. Cultivation to control competing
Typically the surface layer is brown and pale brown vegetation should be continued for as many years as
loam about 10 inches thick.The upper 25 inches of the un- possible following planting.Trees that are best suited and
to e have good survival are Rocky Mountain juniper, eastern
derlying material is pale brown loam.The lower part
tedeedar•ponderosa pine,Siberian elm,Russian-olive,and
depth of 60 inches is pale brown fine sandy loam.
Permeability is moderate. Available water capacityla haekberry. The shrubs best suited are sku^kbuah sumac,
lilac,Siberian
high. The effective rooting depth is 60 inches or more. peashrub,and American plum.
Surface runoff is rapid, and the erosion hazard is Wildlife la an important secondary use of this soil The
cropland areas provide favorable habitat for ring-necked
moderate.
This soil is suited to limited cropping. Intensive pheasant and mourning dove. Many nongame species can
cropping is hazardous because of erosion. The cropping be attracted by establishing areas for nesting and escape
system should be limited to such close grown crops as a1- cover. For pheasants,undisturbed nesting cover is essen-
falls, wheat, and barley. This soil also is suited to ir- dal and should be included in plans for habitat develop
meet. M areas of intensive
years pasture. A suitable cropping system is 8 to 4 rn antelope,
Range-
land wildlife,for example,the pronghorn antelope,can be
grain and alfalfa seeded with a flume crop. attracted by developing livestock watering facilities,
��. Close grown crops can be irrigated from closely spaced managing livestock grazing,and reseeding where needed.
contour ditches or sprinklers. Contour furrows or sprin- This soil has good potential for urban and recreational
Hers should be used for new crops. Applications of development Increased population growth in the survey
nitrogen and phosphorus help in maintaining good produc- area has resulted in increased homesite construction. The
tion chief limiting soil feature for urban development and road
The potential native vegetation is dominated by blue construction is the limited capacity of this soil to support
gram. Sideoata grams, little bluestem, western wheat- a load.Septic tank absorption fields function properly,but
grass,and sedge are also prominent. Potential production community sewage systems should be provided if the
ranges from 1,800 pounds per acre in favorable years to population density increases. Because of the permeability
1,500 pounds in unfavorable years. As range condition of the substratum, sewage lagoons must be sealed.
deteriorates, the sideoats grama and little bluestem Lawns, shrubs, and trees grow well Capability subclass
decrease; forage production drops; and blue game, but- IVe irrigated,Vle nonirrigated; Loamy Plains range site.
falograss, and several perennial forts and shrubs in-
crease. Undesirable weeds and annuals invade the site as
range condition becomes poorer.
Management of vegetation should he based on taking
half and leaving half of the total annual production.Seed-
ing is desirable if the range is in poor condition. Sideats
grams, little bluestem, western wheatgrass, and pu-
bescent wheatgrsss are suitable for seeding. The grass
selected should meet the seasonal needs of livestock It
can be seeded into a clean, firm sorghum stubble, or it
2412 Denby Court • Fort Collins, Colorado 80526 • (970) 207-0272 • fax: (561)828-8059
email: toddhodgesdesign@earthlink.net
eTh
Todd HodgesDesign,
LLC
Soil Survey of Weld County, Colorado excerpt (Southern Portion)
Published by the United States Department of Agriculture
Soil Conservation Service
In Cooperation with Colorado Agricultural Experiment Station
issued September 1980
Soil Classification #65: Thedalund loam, 3 to 9 percent slopes
65—Thedale d loam, 3 to 9 percent slopes. This is a
moderately deep, well drained soil on plains at elevations livestock and wildlife share the range.Livestock watering
of 4.90(1 to 5150 feet. 1t formed in residuum from shale. facilities also are utilized by various wildlife species. The
Included in mapping are small areas of soils that have cropland areas provide favorable habitat for pheasant and
shale and sandstone deeper than 40 inches Some small mourning dove. Many nongame species can be attracted
outcrops of shale and sandstone are also inehaded. by establishing areas for nesting and escape cover.
Typically the surface layer of this Thedalund soil is The underlying shale is the most limiting feature of
brown loam about b inches thick.The underlying material this soil. Neither septic tank absorption fields nor sewage
is pale brown and very pale brown loam. Shale is at a lagoons function properly. In places the underlying shale
depth of about 25 inches. has high shrink-swell potential. Environmental and beau-
Permeability and available water capacity are tification plantings of trees and shrubs can be difficult to
moderate. The effective rooting depth is 20 to 40 inches. establish. Capability subclass IVe irrigated, Vie nonir-
Surface runoff is medium to rapid,and the erosion hazard rigated; Loamy Plains range site.
is moderate.
This soil is suited to limited cropping. Intensive
cropping is hazardous because of erosion. The cropping
system should be limited to such close grown crops as al-
falfa. wheat, and barley. The soil is also suited to ir-
rigated pasture. A suitable cropping system is 3 to 4
years of alfalfa followed by 2 years of corn and small
grain and alfalfa seeded with a nurse crop.
/*".." Closely spaced contour ditches or sprinklers can be
used in irrigating close grown crops. Contour furrows or
sprinklers should be used for new crops. Application of
commercial fertilizer helps in maintaining good produc-
tion.
The potential native vegetation is dominated by blue
grams Several mid grasses, such as western wheatgrass
and needleandthread, are also present. Potential produc-
tion ranges from 1.600 pounds per acre in favorable years
to 1,000 pounds in unfavorable years. As range condition
deteriorates, the mid grasses decrease; blue grams, buf-
falograss, snakeweed, yucca, and fringed sage inerease:
and forage production drops. Undesirable weeds and an-
nuals invade the site as range condition becomes poorer.
Management of vegetation on this soil should be based
on taking half and leaving half of the total annual produc-
tion.Seeding is desirable if the range la in poor condition.
Skdeoata grams, little bluestem,western wheatgrasa, blue
grams.,pubescent whestgrass,and crested wheatgrass are
suitable for seeding. The grass selected should meet the
seasonal requirements of livestock- It can be seeded into
a clean, firm sorghum stubble,or it can be drilled into a
firm prepared seedbed. Seeding early in spring has
proven most successful.
Windbreaks and environmental plantings are generally
not suited to this soiL Onalte investigation is needed to
determine if plantings are feasible.
Rangeland wildlife, such as antelope, cottontail, and
coyote,are beet suited to this soil. Because forage produc-
tion is typically low, grazing management is needed if
2412 Denby Court • Fort Collins, Colorado 80526 • (970) 207-0272 • fax: (561)828-8059
email: toddhodgesdesign*earthlinknet
n n
Todd Hodges Design, LLC
Soil Survey of Weld County, Colorado excerpt(Southern Portion)
Published by the United States Department of Agriculture
Soil Conservation Service
In Cooperation with Colorado Agricultural Experiment Station
Issued September 1980
Soil Classification #82: Wiley-Colby complex, 1 to 3 percent slopes
82—Wiley-Celby complex. 1 to 3 percent slopes.This
nearly level map unit is on smooth plains in the western Management of vegetation on this soil should be based
part of the survey area at elevations of 4,850 to 6,000 on taking half and leaving half of the total annual produc-
feet. The Wiley soil makes up about 60 percent of the Lion. Seeding is desirable if the range is in poor condition,
unit, and the Colby Boil about 30 percent About 10 per- Sideoats grams,little bluestem,western wheatgraaa,blue
cent is Heidi silty clay and Weld loam. grams,pubescent wheatgrass,and created wheatgrass are
The Wiley soil is deep and well drained. It formed in suitable for seeding. The grass selected should meet the
calcareous Kilian deposits. Typically the surface layer is seasonal requirements of livestock. It can be seeded into
pale brown silt loam about 11 inches thick.The subsoil is a clean, firm sorghum stubble or it can be drilled into a
pale brown silty clay loam about 23 inches thick.The sub- fine prepared seedbed. Seeding early in spring has
stratum to a depth of 60 inches is very pale brown silty proven most successful.
cam'loam. Windbreaks and environmental plantings are generally
Permeability is moderately slow. Available water well suited to these soils.Cultivation to control competing
capacity is high. The effective rooting depth is 60 inches vegetation should be continued for as many years as
or more. Surface runoff is medium, and the erosion possible following planting.Trees that are best suited and
hazard is moderate. have survival are Rocky
The Colby sail oleo ie deep and well drained and formed goodk Mountain juniper, eastern
in calcareous eoWn deposits. Typically the surface layer redcedar,ponderosa pine,Siberian elm,Russian-olive,sumac,
and
is pale brown loam about 7 inches thick The underlying li Siberian
The shrubs beet suited are skunkbush sumaq
material is very pale brown silt loam to a depth of 60 lilac, peashrub,and American plum.
inches. Openland wildlife, such as pheasant, mourning dove,
Permeability is moderate. Available water capacity is and cottontail are best suited to these soils. Wildlife
high. The effective rooting depth is 60 inches or more. habitat development, including tree and shrub plantings
Surface runoff is medium, and the erosion hazard is and grass plantings to serve as nesting areas, should be
moderate. successful without irrigation during most yen Under ir-
This map unit is used for irrigated and nonirrigated rigatior,good wildlife habitat can be established, benefit-
cropland and for rangeland, wildlife habitat, and urban ing many kinds of openland wildlife.
development. The Wiley soil has only fair potential for urban and
In irrigated areas these soils are suited to all crops recreational development. Slow permeability, moderate
commonly grown hi the area, including corn,sugar beets, shrink-swell potential, and limited bearing capacity cause
beans, alfalfa, small grain, and onions. An example of a problems in dwelling and road construction. The Colby
suitable cropping system is 3 to 4 years of alfalfa fol- soil has good potential for urban and recreational develop-
lowed by corn,corn for silage,sugar beets small grain,or ment Road design can be modified to compensate for the
beans. Land leveling, ditch lining, and installing pipelines limited capacity of this soil to support a load. Capability
may be needed for proper water applications. subclass Ile ran irrigated, Loamy Plains I Ve no
All methods of irrigation are suitable, but furrow ir- ge site.
rigation is the most common. Barnyard manure and mm- - -- - -- - - - —-
inertial fertilizer are needed for top yields.
In nonirrigated areas these sons are suited to winter
wheat, barley, and sorghum. Most of the acreage is
planted to winter wheat The predicted average yield is
28 bushels per acre. The soil is summer (allowed in al-
ternate years to allow moisture accumulation. Generally
precipitation is too low for beneficial use of fertilizer.
Stubble mulch farming,etriperopping and minimum til-
lage are needed to control soil blowing and water erosion.
Terracing also may be needed to control water erosion.
The potential native vegetation is dominated by blue
grama. Several mid grasses such as western wheatgrass
and needleandthresd are also present. Potential produc-
tion ranges from 1,600 pounds per acre in favorable years
to 1,000 pounds in unfavorable years. As range condition
deteriorates, the mid grasses decrease; blue grams, buf-
Telegraaa, snakeweed, yucca and fringed sage increase;
and forage production drops. Undesirable weeds and an-
nuals invade the site as range condition becomes poorer.
2412 Denby Court • Fort Collins, Colorado 80526 • (970) 207-0272 • fax: (561)828-8059
email: toddhodgesdesign(dearthlink.net
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