HomeMy WebLinkAbout960925.tiff STATE OF COLORADO
COLORADO GEOLOGICAL SURVEY
Division of Minerals and Geology
Department of Natural Resources
1313 Sherman Street, Rm. 715 Weld County Planning Dept.
Denver,Colorado 80203 DEPARTMENT OF
Phone(303)866-2611 NATURAL
FAX(303)866-2461 RESOURCES
APR 0 41996
March 26, 1996 Roy Romer
Governor
1.1 } so-
Ken Salazar
Executive Director
Ms. Shani Eastin WE-96-0011 Michael B.Long
Division Director
Weld County Planning Department Vicki Cowart
1400 N. 17th Avenue State Geologist
and Director
Greeley, CO 80631
Re: Minch Subdivision :"' .77
CGS Review No. WE-96-0011 / ace/4,
Dear Ms. Eastin:
In response to your request I reviewed the application for a change in zone. As this property was
originally zoned agricultural, I find no problem with this planned land use. One thing to keep
in mind when constructing a home in this area is that the surficial material is composed of loess,
which has a tendency to consolidate when wet. At least one subsurface soil sample should be
collected from the building envelope and tested for consolidation and swell potential. The
foundation design should incorporate the test results to help prevent post-construction damage due
to settling or swelling. Also, some shallow water-bearing alluvial gravels occur in the area that
may pose a subsurface drainage problem to basements. Therefore, if subgrade construction is
intended, it would be wise to dig a test pit or drill a test hole to the proposed foundation depth
to evaluate the groundwater situation. If shallow groundwater is present, foundation drains should
be installed.
The drainageway in the southwestern corner of the property should be platted as an easement,
and there should be construction provisions for any subsurface utilities crossing the drainage.
Please contact me if I can be of further assistance.
Sincerely,
Weld County Planning Dept.
APR
0 4 1996
Celia Greenman
Geologist
I VE D
960925
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, ,, WELD COUNTY, COLORADO, SOUTHERN PART 15
r?;rigating close grown crops and pasture. Furrows, contour of 4,850 to 5,050 feet. It formed in calcareous eolian .
s.',:; Porrows, and cross slope furrows are suitable for row deposits. Included in mapping are small areas of soils that '
c'-crops. Sprinkler irrigation is also desirable. Keeping til- have fine sandy loam or loam underlying material and
,,,• lage to a minimum and utilizing crop residue help to con- small areas of soils that are shallow to moderately deep
trol erosion. Maintaining fertility is important. Crops over shale and sandstone.
r respond to applications of phosphorus and nitrogen. Typically the surface layer of this Colby soil is pale
In nonirrigated areas this soil is suited to winter wheat. brown loam about 7 inches thick. The underlying material
The predicted average yield is 28 bushels per acre. The is very pale brown silt loam to a depth of 60 inches.
' -soil is summer fallowed in alternate years to allow Permeability is moderate. Available water capacity is
moisture accumulation. Generally precipitation is too low high. The effective rooting depth is 60 inches or more.
;:!-• for beneficial use of fertilizer. Surface runoff is rapid, and the erosion hazard is high.
Stubble mulch farming, striperopping, and minimum til- This soil is suited to limited cropping.. Intensive i '
lage are needed to control soil blowing and water erosion. cropping is hazardous because of erosion. The cropping
•Terracing also may be needed to control water erosion. system should be limited to close grown crops, such as al- ,
The potential native vegetation is dominated by blue falfa, wheat, and barley. This soil also is suited to it-:
•: grama. Several mid grasses, such as western wheatgrass rigated pasture. A suitable cropping system is 3 to 4
«'rand needleandthread, are also present. Potential produc- years of alfalfa followed by 2 years of corn and small
rXtion ranges from 1,600 pounds per acre in favorable years grain and alfalfa seeded with a nurse crop. i
• :,to 1,000 pounds in unfavorable years. As range condition Close grown crops can be irrigated from closely spaced :
'-deteriorates, the mid grasses decrease; blue grama, buf- contour ditches or sprinklers. Contour furrows or sprin-
. f• alograss, snakeweed, yucca, and fringed sage increase; klers should be used for new crops. Applications of
:.,:.and forage production drops. Undesirable weeds and an- nitrogen and phosphorus help in maintaining good produc-:
'nnals invade the site as range condition becomes poorer. tion.
Management of vegetation on this soil should be based The potential native vegetation is dominated by blue
on taking half and leaving half of the total annual produc- grama. Sideoats grama, little bluestem, western wheat-
tion.Seeding is desirable if the range is in poor condition. grass, and sedge are also prominent. Potential production
• Sideoats grama, little bluestem, western wheatgrass, blue ranges from 1,800 pounds per acre in favorable years to
grama,pubescent wheatgrass, and crested wheatgrass are 1,500 pounds in unfavorable years. As range condition
suitable for seeding. The grass selected should meet the deteriorates, the sideoats grama and little bluestem
...seasonal requirements of livestock. It can be seeded into decrease, forage production drops, and blue grama, buf-
: a clean, firm sorghum stubble, or it can be drilled into a falograss, and several perennial forbs and shrubs in-
:. fain prepared seedbed. Seeding early in spring has crease. Undesirable weeds and annuals invade the site as
`.proven most successful. range condition becomes poorer.
•' Windbreaks and environmental plantings of trees and Management should be based on taking half and leaving
shrubs commonly grown in the area are generally well half of the total annual production. Seeding is desirable if
suited to this soil. Cultivation to control competing the range is in poor condition. Sideoats grama, little
vegetation should be continued for as many years as bluestem, western wheatgrass, and pubescent wheatgrass
possible following planting. Trees that are best suited and are suitable for seeding. The grass selected should meet
have good survival are Rocky Mountain juniper, eastern the seasonal needs of livestock. It can be seeded into a
redcedar, ponderosa pine, Siberian elm, Russian-olive, and clean, firm sorghum stubble, or it can be drilled into a.
hackberry. The shrubs best suited are skunkbush sumac, firm prepared seedbed. Plowing and drilling should be on
lilac,Siberian peashrub, and American plum. the contour to minimize runoff and soil losses. Seeding
Openland wildlife, such as. pheasant, mourning dove, early in spring has proven most successful.
and cottontail, and rangeland wildlife, such as antelope, Windbreaks and environmental plantings of trees and,
cottontail, and coyote, are best suited to this soil. Under shrubs commonly grown in the area are generally well
irrigation, good wildlife habitat can be established, suited to this soil. Cultivation to control competing
benefiting many kinds of openland wildlife. Forage vegetation should be continued for as many years as,
production is typically low on rangeland, and grazing possible following planting. Trees that are best suited and
management is needed if livestock and wildlife share the have good survival are Rocky Mountain juniper, eastern
range. Livestock watering facilities also are utilized by redcedar, ponderosa pine, Siberian elm, Russian-olive, and
various wildlife species. hackberry. The shrubs best suited are skunkbush sumac,:
This soil has good potential for urban and recreational lilac, Siberian peashrub, and American plum. ,
developments. Road design can be modified to compen- Openland wildlife, such as pheasant, mourning dove,
sate for the limited capacity of this soil to support a load. and cottontail, and rangeland wildlife, such as antelope,
Capability subclass IIIe irrigated, IVe nonirrigated; cottontail, and coyote, are best suited to this soil. Under
Loamy Plains range-site. irrigation, good wildlife habitat can be established,
[17—Colby loam, 5 to 9 percent slopes.ithis is a deep, benefiting many kinds of openland wildlife. Forage
well drained soil on uplandilill''s s d fidg at elevations production is typically low on.rangeland, and grazing
960925 . .
16 SOIL SURVEY
management is needed if livestock and wildlife share the ments of livestock. It can be seeded into a clean
range. Livestock watering facilities also are utilized by sorghum stubble, or it can be drilled into a firm pr(
various wildlife species. seedbed. Plowing and drilling should be on the corn
This soil has good potential for urban and recreational minimize runoff and soil losses. Seeding early in
developments. Road design can be modified to compen- has proven most successsful. Capability subclas
sate for the limited capacity of this soil to support a load. nonirrigated; Colby soil in Loamy Slopes rang(
Capability subclass IVe irrigated, VIe nonirrigated; Adena soil in Loamy Plains range site.
Loamy Slopes range site. 19—Colombo clay loam, 0 to 1 percent slopes. '
18—Colby-Adena loans, 3 to 9 percent slopes. These a deep, well drained soil on flood plains and terra
gently sloping to moderately sloping soils are on plains, elevations of 4,600 to 4,780 feet. It formed in str
hills, and ridges at elevations of 4,750 to 4,900 feet. The calcareous alluvium. Included in mapping are small
Colby soil, which makes up about 55 percent of the map of soils that have a loam surface layer and some
unit, occupies the steeper, convex parts of the landscape. leveled areas.
The Adena soil, about 30 percent of the unit, occupies the Typically the surface layer of this Colombo soil i
less steep, slightly concave parts. About 15 percent is grayish brown clay loam about 14 inches thick. The
Kim loam and Weld loam. 7 inches of the underlying material is pale
The Colby soil is deep arid well drained. It formed in stratified clay loam and loam. The lower part to a
calcareous eolian deposits. Typically the surface layer is of 60 inches is very pale brown loam stratified wit.
pale brown loam about 7 inches thick. The underlying lenses of fine sand, medium sand, and clay loam.
material to a depth of 60 inches is very pale brown silt Permeability is moderate. Available water capa
loam. high. The effective rooting depth is 60 inches or
Permeability is moderate. Available water capacity is Surface runoff is slow, and the erosion hazard is low
high. The effective root.inw depth is 60 inches or more. In irrigated areas this soil is suited to crops corn
Surface runoff is rapid, and the erosion hazard is high. grown in the area, such as corn, sugar beets, beans,
The Adena soil also is deep and well drained and fa, onions, and potatoes.
formed in calcareous eolian deposits. Typically the surface All methods of irrigation that are common to th(
layer is brown loam about 6 inches thick. The subsoil is are used. Borders are suitable for small grain, alfalf
brown and very pale brown clay loam about 3 inches pasture. Furrow irrigation is used for row crops.
thick. The substratum to a depth of 60 inches is very pale respond to application of nitrogen and phosphorus.
brown silt loam. Windbreaks and environmental plantings of tree
Permeability is slow. Available water capacity is high. shrubs commonly grown in the area are general]
The effective rooting depth is 60 inches or more. Surface suited to this soil. Cultivation to control court
runoff is medium, and the erosion hazard is moderate. vegetation should be continued for as many yea
This unit is used for nonirrigated cropland and range- possible following planting. Trees that are best suite
land. It is suited to winter wheat, barley, and sorghum. have good survival are Rocky Mountain juniper, e:
Most of the acreage is planted to winter wheat and is redcedar, ponderosa pine, Siberian elm, Russian-oliv'
summer (allowed in alternate years to allow moisture ac- hackberry. The shrubs best suited are skunkbush s
cumulation. Generally precipitation is too low for benefi- lilac, Siberian peashrub, and American plum.
cial use of fertilizer. Wildlife is an important secondary use of thii-
Stubble mulch farming, striperopping, and minimum til- Ring-necked pheasant, mourning dove, and many
lage are needed to control soil blowing and water erosion. game species can be attracted by establishing are:
Terracing also may be needed to control water erosion. nesting and escape cover. For pheasants, undist
The potential native vegetation on this unit is nesting cover is essential and should be included in
dominated by blue grania. Sideoats grama, little bluestem, for habitat development, especially in areas of int(
and western wheatgrass are also prominent. Potential agriculture.
production ranges from 1,800 pounds per acre in favora- Where this soil is on flood plains and is suscepti!
ble years to 1,100 pounds in unfavorable years. As range flooding it has poor potential for urban and recrea
condition deteriorates, the sideoats grama and little development. On the higher terraces the potential i
bluesten decrease, forage production drops, and blue Dwelling and road designs need to be modified
grama, buffalograss, and several perennial forbs and crease the capacity of the soil to support a load a
shrubs increase. Undesirable weeds and annuals invade protect it against frost action. Capability subclass I
the site as range condition becomes poorer. rigated.
Management should be based on taking half and leaving 20—Colombo clay loam, 1 to 3 percent slopes. T
half of the total annual production. Seeding is desirable if a deep, well drained soil on flood plains and terra(
the range is in poor condition. Sideoats grama, little elevations of 4,600 and 4,780 feet. It formed in stra
bluestern, western wheatgrass, bluegrama, pubescent calcareous alluvium. Included in mapping are small
i wheatgrass, and crested wheatgrass are suitable for seed- of soils that have a loam surface layer. Some
ing. The grass selected should meet the seasonal require- leveled areas are also included.
960925
42 SOIL SURVEY
Typically the surface layer is brown loam about 8 The underlying shale is the most limiting feature of
inches thick. The underlying material is pale brown and this soil. Neither septic tank absorption fields nor sewage
very pale brown loam. Shale is at a depth of about 28 lagoons function properly. In places the underlying shale
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 IVs irrigated; IVe nonir-
Surface runoff is medium, and the erosion hazard is low. rigated; Loamy Plains range site.
This soil is suited to limited cropping. A suitable 65—Thedalund loam, 3 to 9 percent slopes. This is a
cropping system is 3 to 4 years of alfalfa followed by 2 moderately deep, well drained soil on plains at elevations
years of corn and small grain and alfalfa seeded with a of 4,900 to 5,250 feet. It formed in residuum from shale.
nurse crop. Incorporating plant residue and manure im- Included in mapping are small areas of soils that have
proves tilth and provides organic matter and plant shale and sandstone deeper than 40 inches. Some small
nutrients. outcrops of shale and sandstone are also included.
Most irrigation methods are suitable, but the length of Typically the surface layer of this Thedalund soil is
runs should be short to prevent overirrigation. Light, brown loam about 8 inches thick. The underlying material
frequent irrigations are best. Sprinkler irrigation is is pale brown and very pale brown loam. Shale is at a
desirable. Commercial fertilizers increase yields and add depth of about 25 inches.
to the value of the forage produced. Permeability and available water capacity are
In nonirrigated areas this soil is suited to winter wheat, moderate. The effective rooting depth is 20 to 40 inches.
barley, and sorghum. Most of the acreage is planted to Surface runoff is medium to rapid, and the erosion hazard
winter wheat. The predicted average yield is 25 bushels is moderate.
per acre. The soil is summer fallowed in alternate years This soil is suited to limited cropping. Intensive
to allow moisture accumulation. Generally precipitation is cropping is hazardous because of erosion. The cropping
too low for beneficial use of fertilizer. system should be limited to such close grown crops as al-
Stubble mulch farming, striperopping, and minimum til- falfa, wheat, and barley. The soil is also suited to ir-
lage are needed to control soil blowing and water erosion. rigated pasture. A suitable cropping system is 3 to 4
Terracing also may be needed to control water erosion. Years of alfalfa followed by 2 years of corn and small
The potential native vegetation is dominated by blue grain and alfalfa seeded with a nurse crop.
Closely spaced contour ditches or sprinklers can be
grama. Several mid grasses, such as western wheatgrass
and needleandthread, are also present. Potential produc- used in irrigating close grown crops. Contour furrows or
tion ranges from 1,600 pounds per acre in favorable years sprinklers should be used for new crops. Application of
to 1,000 pounds in unfavorable years. As range condition commercial fertilizer helps in maintaining good produc
tion.
deteriorates, the mid grasses decrease; blue grama, buf- The potential native vegetation is dominated by blue
falograss, snakeweed, yucca, and fringed sage increase; grama. Several mid grasses, such as western wheatgrass
and forage production drops. Undesirable weeds and an- and needleandthread, are also present. Potential produc-
nuals invade the site as range condition becomes poorer. tion ranges from 1,600 pounds per acre in favorable years
Management of vegetation on this soil should be based to 1,000 pounds in unfavorable years. As range condition
on taking half and leaving half of the total annual produc- deteriorates, the mid grasses decrease; blue grama, buf-
tion. Seeding is desirable if the range is in poor condition. falograss, snakeweed, yucca, and fringed sage increase;
Sideoats grama, little bluestem, western wheatgrass, blue and forage production drops. Undesirable weeds and an-
grama, pubescent wheatgrass, and crested wheatgrass are nuals invade the site as range condition becomes poorer.
suitable for seeding. The grass selected should meet the Management of vegetation on this soil should be based
seasonal requirements of livestock. It can be seeded into on taking half and leaving half of the total annual produc-
a clean, firm sorghum stubble, or it can be drilled into a tion. Seeding is desirable if the range is in poor condition.
firm prepared seedbed. Seeding early in spring has Sideoats grama, little bluestem, western wheatgrass, blue '.
proven most successful. grama, pubescent wheatgrass, and crested wheatgrass are
Windbreaks and environmental plantings are generally suitable for seeding. The grass selected should meet the
not suited to this soil. Onsite investigation is needed to seasonal requirements of livestock. It can be seeded into
determine if plantings are feasible. a clean, firm sorghum stubble, or it can be drilled into a
Rangeland wildlife, such as antelope, cottontail, and firm prepared seedbed. Seeding early in spring has
coyote, are best suited to this soil. Because forage produc- proven most successful.
tion is typically low, grazing management is needed if Windbreaks and environmental plantings are generally
livestock and wildlife share the range. Livestock watering not suited to this soil. Onsite investigation is needed to
facilities also are utilized by various wildlife species. The determine if plantings are feasible.
cropland areas provide favorable habitat for pheasant and Rangeland wildlife, such as antelope, cottontail, and
mourning dove. Many nongame species can be attracted coyote, are best suited to this soil. Because forage produc-
by establishing areas for nesting and escape cover. tion is typically low, grazing management is needed if
960925
s
F y
WELD COUNTY, COLORADO, SOUTHERN PART 43
livestock and wildlife share the range. Livestock watering ing. The grass selected should meet the seasonal require-
of �` facilities also are utilized by various wildlife species. The ments of livestock. It can be seeded into a clean, firm
ge ,,, ' cropland areas provide favorable habitat for pheasant and sorghum stubble, or it can be drilled into a firm prepared
le .` mourning dove. Many nongame species can be attracted seedbed. Seeding early in spring has proven most success-
ir- }; by establishing areas for nesting and escape cover. ful.
to The underlying shale is the most limiting feature of Windbreaks and environmental plantings of trees and
r- 1,4-::,'
z t. this soil. Neither septic tank absorption fields nor sewage shrubs commmonly grown in the area are generally well
lagoons function properly. In places the underlying shale suited to this soil. Cultivation to control competing
a has high shrink-swell potential. Environmental and beau- vegetation should be continued for as many years as
:S + tification plantings of trees and shrubs can be difficult to possible following planting. Trees that are best suited and
2. T4 establish. Capability subclass IVe irrigated, VIe nonir- have good survival are Rocky Mountain juniper, eastern
e rigated; Loamy Plains range site. redcedar, ponderosa pine, Siberian elm, Russian-olive, and
I 66—Ulm clay loam, 0 to 3 percent slopes. This is a hackberry. The shrubs best suited are skunkbush sumac,
deep, well drained soil on plains at elevations of 5,075 to lilac, Siberian peashrub, and American plum.
s 5,200 feet. It formed in alluvial and eolian sediments from Wildlife is an important secondary use of this soil. The
1 shale. Included in mapping are small areas of soils that cropland areas provide favorable habitat for ring-necked
have shale between 40 and 60 inches. Also included are pheasant and mourning dove. Many nongame species can
small areas of soils where the surface layer and subsoil be attracted by establishing areas for nesting and escape
j:, have been recharged with lime from irrigation. cover. For pheasants, undisturbed nesting cover is essen-
Typically the surface layer of this Ulm soil is brown tial and should be included in plans for habitat develop-
, clay loam about 5 inches thick. The subsoil is brown and ment, especially in areas of intensive agriculture. Range-
pale brown clay about 14 inches thick. The substratum to land wildlife, for example, the pronghorn antelope, can be
a depth of 60 inches is clay and clay loam. attracted by developing livestock watering facilities,
Permeability is slow. Available water capacity is high. managing livestock grazing, and reseeding where needed.
The effective rooting depth is 60 inches or more. Surface This soil has poor potential for urban and recreational
runoff is medium, and the erosion hazard is low. development. Slow permeal ty and high shrink swell
In irrigated areas this soil is suited to all crops corn- cause problems in dwelling and road construction. Capa-
monly grown in the area, including corn, sugar beets, bility subclass Ile irrigated, 1Ve nonirrigated; Clayey
beans, alfalfa, and small grain. An example of a suitable Plains range site.
q, cropping system is 3 to 4 years of alfalfa followed by 67—Ulm clay loam, 3 to 5 percent slopes. This is a
i' corn, corn for silage, sugar beets, small grain, or beans. deep, well drained soil on plains at elevations of 5,075 to
Land leveling, ditch lining, and installing pipelines are 5,200 feet. It formed in alluvial and eolian sediments from
needed for proper water applications. shale. Included in mapping are small areas of soils that
All methods of irrigation are suitable, but furrow ir- have shale between depths of 40 and 60 inches. Also in-
rigation is the most common. Barnyard manure and com- eluded are small areas of soils where the surface layer
mercial fertilizer are needed for top yields. and subsoil have been recharged with lime from irriga-
In nonirrigated areas this soil is suited to winter wheat, tion.
1. barley, and sorghum. Most of the acreage is planted to Typically the surface of this Ulm soil is brown clay
winter wheat. The predicted average yield is 28 bushels loam about 5 inches thick. The subsoil is brown and pale
per acre. The soil is summer fallowed in alternate years brown clay about 12 inches thick. The substratum to a
to allow moisture accumulation. Generally precipitation is depth of 60 inches is clay and clay loam.
` too low for beneficial use of fertilizer. Permeability is slow. Available water capacity is high
Stubble mulch farming, striperopping, and minimum til- The effective rooting depth is 60 inches or more. Surface
lage are needed to control soil blowing and water erosion. runoff is medium, and the erosion hazard is moderate.
Terracing also may be needed to control water erosion. In irrigated areas this soil is suited to the crops corn-
-,,
The potential native vegetation is dominated by monly grown in the area. Perennial grasses and alfalfa or
western wheatgrass and blue grama. Buffalograss is also close grown crops should be grown at least 50 percent of
present. Potential production ranges from 1,000 pounds the time. Contour ditches and corrugations can used it
1. per acre in favorable years to 600 pounds in unfavorable irrigating close grown crops and pasture. Fur.ows, con
years. As range condition deteriorates, a blue grama-buf- tour furrows, and cross slope furrows are suitable for rov
falograss sod forms. Undesirable weeds and annuals in- crops. Sprinkler irrigation is also desirable. Keeping til.
vade the site as range condition becomes poorer. lage to a minimum and utilizing crop residue help to con
Management of vegetation on this soil should be based trol erosion. Maintaining fertility is important. Crop:
on taking half and leaving half of the total annual produc- respond to applications of phosphorus and nitrogen.
'
w tion. Range pitting can reduce runoff. Seeding is desirable In nonirrigated areas this soil is suited to winter wheat
if the range is in poor condition. Western wheatgrass, barley, and sorghum. Most of the acreage is planted to
blue grama, sideoats grama, buffalograss, pubescent winter wheat. The predicted average yield is 28 bushel
wheatgrass, and crested wheatgrass are suitable for seed- per acre. The soil is summer fallowed in alternate year,
960925
SOIL SURVEY
40
from 800 poundsvo I Lcre
s in favorable
range lco condition deters-- ble pro(
years to ranges
poundsl n50 unfavorable yearss per acre.
pounds in unfavorable ye g
orates, the mid grasses decrease and forage production condition deteriorates, the sideoats grama, little
drops. Undesirable weeds and annuals invade the site as and sand reedgrass decrease; yucca, sedge;
range condition becomes poorer. grama increase; and forage production drops.
Management of vegetation on the Shingle soil should be Management of vegetation should be based
lased on taking half and leaving half of the total annual half or
less of the e total annual improving rangeproduction.
ocacti condition.
ing is
production. Seeding is desirable if the range is in poor echanical treatment are impractical.
condition. Western wheatgrass, blue grama, alkali sacaton, mWindbreaks and environmental plantings an
sideoats grama, little bluestem, pubescent wheatgrass,
and crested wheatgrass are suitable for seeding. The not suited to this soil. Onsite investigation is
grass selected should meet the seasonal requirements of determine if plantings are feasible.
livestock. It can be seeded into a clean, firm sorghum Production of vegetation on this treeless
during drought, when annual product
stubble, or it can be drilled into a firm prepared seedbed. as low as 300 pounds per acre. Rangeland wildl
Seeding early in spring has proven most successful. antelope and scaled quail, can be attracted by
The potential native vegetation on the Renohill soil is livestock grazing, installing livestock waterin+
dominated by western wheatgrass and blue grama. Buf- and reseeding where needed.
falograss is also presented. Potential production ranges This soil has poor potential for urban develo
from 1,000 pounds per acre in favorable years to 600 pounds in unfavorable years. As range condition deteri- chief limiting feature is the shallow depth toCapability subclass VIe irrigated, VIe nonirrig
orates, a blue grama-buffalograss sod forms. Undesirable stone Breaks range site.
weeds and annuals invade the site as range condition 62—Terry fine sandy loam, 0 to 3 percent
becomes poorer. is a moderately deep, well drained soil on plai
Management of vegetation on the Renohill soil should tions of 4500 to 5,000 feet. It formed in res
be based on taking half and leaving half of the total an- ,sandstone. Included in mapping are small ar
nual production. Range pitting can reduce runoff. Seeding that have sandstone deeper than 40 inches. A
is desirable if the range is in poor condition. Western are small areas of soils that have a subsoil of
wheatgrass, blue grama, sideoats grama, buffalograss, pu- loam and clay loam.
bescent wheatgrass, and crested wheatgrass are suitable Typically the surface layer of this Terry
for seeding. The grass selected should meet the seasonal brown fine sandy loam about 6 inches thick.T
requirements of livestock. It can be seeded into a clean, pale brown fine sandy loam about 21 inches
firm sorghum stubble, or it can be drilled into a firm substratum is very pale brown fine sandy
prepared seedbed. Seeding early in spring has proven stone is at a depth of about 37 inches.
most successful. Permeability is moderately rapid. Avai
Rangeland wildlife, such as antelope, cottontail, and capacity is moderate. The effective rooting d,
coyote, are best suited to this unit. Because forage 40 inches. Surface runoff is slow, and the el
production is typically low, grazing management is needed is low.
if livestock and wildlife share the range. Livestock water- This soil is suited to most of the irrigate(
ing facilities also are utilized by various wildlife species. monly grown in the area. The moderate de
Capability r ,bclass VIe irrigated, VIe nonirrigated; Shin- some crops. A suitable cropping system is c(
gle soil in Shaly Plains range site, Renohill soil in Clayey silage, barley, 3 to 4 years of alfalfa, and wh
Plains range site. is also well suited to irrigated pasture.
61—Tassel fine sandy loam, 5 to 20 percent slopes. Furrows or sprinklers can be used in it
']'his is a shallow, well drained soil on upland breaks at crops. Flooding from contour ditches and s)
elevations of 4,850 to 5,200 feet. It formed in residuum suitable in irrigating close grown crops and p
from sandstone. Included in mapping are small areas of heads of water and short runs reduce the ri:
sandstone outcrop and areas of noncalcareous soils. Production can be maintained by frequent it
Typically the surface layer of this Tassel soil is light by applications of barnyard manure and comi
yellowish brown fine sandy loam about 7 inches thick.The izer. Keeping tillage to a minimum and ►
underlying material is light yellowish brown very fine residue are important.
sandy loam. Sandstone is at a depth of about 11 inches. In nonirrigated areas this soil is suited to
Permeability is moderately rapid. Available water barley, and sorghum. Most of the acreage
capacity is low. The effective rooting depth is 10 to 20 winter wheat. The predicted average yield
inches. Surface runoff is medium, and the erosion hazard per acre.allow e accumulation.is summer followed e alily p
al
is moderate. low for
The potential native vegetation is domithre dleaf ated by tooStubble mulch beneficial use
and
sideoats grama, little bluestem, blue grama,
sedge, sand reedgrass, and needleandthread. Potential lage are needed to control soil blowing and N
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50 0 SOIL SURVEY 0
•
sugar beets, small grain, or beans. Few conservation prac- The potential native vegetation is dominated by blue
tices are needed to maintain top yields. grama. Several mid grasses, such as western wheatgrass
All methods of irrigation are suitable, but furrow ir- and needleandthread, are also present. Potential produc-
rigation is the most common. Barnyard manure and corn- tion ranges from 1,600 pounds per acre in favorable years
mercial fertilizer are needed for top yields. to 1,000 pounds in unfavorable years. As range condition
Windbreaks and environmental plantings generally are deteriorates, the mid grasses decrease; blue grama; buf-
well suited to this soil. Summer fallow a year before falograss, snakeweed, yucca, and fringed sage increase;
planting and continued cultivation for weed control are and forage production drops. Undesirable weeds acid an-
needed to insure establishment and survival of plantings. nuals invade the site as range condition becomes poorer.
Trees that are best suited and have good survival are Management of vegetation on this soil should be based
Rocky Mountain juniper, eastern redcedar, ponderosa on taking half and leaving half of the total annual produc-
pine, Siberian elm, Russian-olive, and hackberry. The tion. Seeding is desirable if the range is in poor condition.
shrubs best suited are skunkbush sumac, lilac, Siberian Sideoats grama, little bluestem, western wheatgrass blue
peashrub, and A rn,rican plum. grama, pubescent wheatgrass, and crested wheatgrass are
Openland wildlife, such as pheasant, mourning dove, suitable for seeding. The grass selected should meet the
and cottontail, are best suited to this soil. Wildlife habitat seasonal requirements of livestock. It can be seeded into
development, including tree and shrub plantings and a clean, firm sorghum stubble, or it can be drilled into a
grass plantings to serve as nesting areas, should be sue- firm prepared seedbed. Seeding early in spring has
cessful without irrigation in most years. Under irrigation, proven most successful. •
good wildlife habitat can be established, benefiting many Windbreaks and environmental plantings are generally
kinds of openland wildlife. well suited to this soil. Summer fallow a year before
This soil has good potential for urban and recreational planting and continued cultivation for weed control are
development. The chief limiting soil features for urban needed to insure establishment and survival of plantings.
development are the shrink-swell potential of the subsoil Trees that are best suited and have good survival are
as it wets and dries and the limited capacity of the soil to Rocky Mountain juniper, eastern redcedar, ponderosa
support a load. Lawns, shrubs, and trees grow well Capa- pine, Siberian elm, Russian-olive, and hackberry. The
bi . cuss Jiaxigated. shrubs best suited are skunkbush sumac, lilac, Siberian
9—Weld loam, 1 to 3 percent slopes! This is a deep, peashrub, and American plum.
well drained soil on smooth plains at elevations of 4,850 to Openland wildlife, such as pheasant, mourning dove,
5,000 feet. It formed in eolian deposits. Included in and cottontail, are best suited to this soil. Wildlife habitat
mapping are small areas of soils that have a subsoil of development, including tree and shrub plantings and
loam and light clay loam. Also included are some leveled grass plantings to serve as nesting areas, should be suc-
areas. cessful without irrigation during most years. Under ir-
Typically the surface layer of this Weld soil is brown rigation, good wildlife habitat can be established, benefit-
loam about S inches thick. The subsoil is brown and pale ing many kinds of openland wildlife.
brown heavy clay loam and light clay about 20 inches This soil has good potential for urban and recreational
thick. The substratum to a depth of 60 inches is silt loam. development. The chief limiting soil features for .urban
Permeability is slow. Available water capacity is high. development are the shrink-swell potential of the subsoil
The effective rooting depth is 60 inches or more. Surface as it wets and dries and the.limited capacity of the soil to
runoff is slow, and the erosion hazard is low. support a load. Lawns, shrubs, and trees grow well.'Capa-
In irrigated areas this soil is suited to all crops corn- bility subclass IIe irrigated, IIIc nonirrigated; Loamy
inonly grown in the area, including corn, sugar beets (fig. Plains range site.
8), beans, alfalfa, small grain, and onions. An example of a 80—Weld loam, 3 to 5 percent slopes. This is a deep,
suitable cropping system is 3 to 4 years of alfalfa fol- well drained soil on plains at elevations of 4,850 to 5,000
lowed by'corn, corn for silage, sugar beets, small grain, or feet. It formed in eolian deposits. Included in mapping are
beans. Land leveling, ditch lining, and installing pipelines small areas of soils that have a subsoil of loam and light
are needed for proper water applications. clay loam.
All methods of irrigation are suitable, but furrow ir- Typically the surface layer is brown loam about 8
rigation is the most common. Barnyard manure and corn- inches thick. The subsoil is brown and pale brown;heavy
mercial fertilizer are needed for top yields. clay loam and light clay about 18 inches thick. The sub-
.This soil is well suited to winter wheat, barley, and stratum to a depth of 60 inches is silt loam.
sorghum if it is summer fallowed in alternate years. Permeability is slow. Available water capacity is high.
Winter wheat is the principal crop. The predicted average The effective rooting depth is 60 inches or more. Surface
yield is 33 bushels per acre. If the crop is winterkilled, runoff is medium, and the erosion hazard is moderate.
spring wheat can be seeded. Generally precipitation is too In irrigated areas this soil is suited to most of the crops
low for beneficial use of fertilizer. commonly grown in the area, such as corn, alfalfa, wheat,
Stubble mulch farming, striperopping, and minimum til- and barley. Sugar beets are often grown. The 'soil is
lage are needed to control soil blowing and water erosion. suited to irrigated pasture. Ditch lining and installing
Terracing also may be needed to control water erosion. pipelines are needed for proper water application.
• 960925
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WELD COUNTY, COLORADO, SOUTHERN PART 29
have good survival are Rocky Mountain juniper, eastern ' The potential native vegetation is dominated by
redcedar, 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- tion. Range pitting can help in reducing runoff. Seeding is
ment, especially in areas of intensive agriculture. desirable if the range is in 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.
tcjiic-areas-and-ptaygrotmds:-eapabilit-y.elass_Lirrigated. vegetation should be continued for as many years as
42—�Iiin. -clay-learn, 1=to 3_percent_doQes:iThis 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
brown 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 com- 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 Eider
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
low 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
lage are needed to control soil blowing and water erosion. loamy very fine sand, loamy sand, or sand.
960925
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