HomeMy WebLinkAbout20051600 soil survey of
Weld County, Colorado
Southern Part
United States Department of Agriculture
Soil Conservation Service
in cooperation with
Colorado Agricultural Experiment Station
2005-1600
)
SHEET NO. 3
WELD COUNTY, COLORADO, SOUTHERN PART
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28 SOIL SURVEY
40—Nunn loam, 1 to 3 percent slopes, This is a deep, vegetation should be continued for as many years as
well drained soil on terraces at elevations of 4,550 to 5,000 possible following planting. Trees that are best suited and
feet. It formed in mixed alluvium. Included in mapping have good survival are Rocky Mountain juniper, eastern
are small, long and narrow areas of sand and gravel redcedar, ponderosa pine, Siberian elm, Russian-olive, and
deposits and small areas of soils that are subject to occa- hackberry. The shrubs best suited are skunkbush sumac,
sional flooding. Some leveled areas are also included. lilac, Siberian peashrub, and American plum.
Typically the surface layer of this Nunn soil is grayish Wildlife is an important secondary use of this soil. The
brown loam about 12 inches thick. The subsoil is light cropland areas provide favorable habitat for ring-necked
brownish gray clay loam about 12 inches thick. The upper pheasant and mourning dove. Many nongame species can
part of the substratum is light brownish gray clay loam. be attracted by establishing areas for nesting and escape
The lower part to a depth of 60 inches is brown sandy cover. For pheasants, undisturbed nesting cover is essen-
loam. tial and should be included in plans for habitat develop-
Permeability is moderately slow. Available water ment, especially in areas of intensive agriculture. Range-
capacity is high. The effective rooting depth is 60 inches land wildlife, for example, the pronghorn antelope, can be
or more. Surface runoff is medium, and the erosion attracted by developing livestock watering facilities,
hazard is low. managing
gig livestock grazing, and reseeding where needed.
In irrigated areas this soil is suited to all crops corn- This soil has fair to poor potential for urban develop-
monly grown in the area, including corn, sugar beets, ment. It has moderate to high shrink swell, low strength,
beans, alfalfa, small grain, potatoes, and onions. An exam- and moderately slow permeability. These features create
ple of a suitable cropping system is 3 to 4 years of alfalfa problems in dwelling and road construction. Those areas
followed by corn, corn for silage, sugar beets, small grain, that have loam or sandy loam in the lower part of the
or beans. Generally such characteristics as a high clay substratum are suitable for septic tank absorption fields
content or a rapidly permeable substratum slightly and foundations. Some areas of this soil are adjacent to
restrict some crops. streams and are subject to occasional flooding. The poten-
All methods of irrigation are suitable, but furrow ir- tial is fair for such recreational development as camp and
rigation is the most common. Proper irrigation water picnic areas and playgrounds. Capability subclass Ile ir-
management is essential. Barnyard manure and commer- rigated, IIIc nonirrigated; Loamy Plains range site.
cial fertilizer are needed for top yields. _... m, 0� 41—Nunn clay loam, 0 to 1 percent slopes.'This is a
Most nonirrigated areas are used for small grain. The eep, well drained soil on terraces and smooth plains at
soil is summer fallowed in alternate years. Winter wheat elevations of 4,550 to 5,150 feet. It formed in mixed allu-
is the principal crop. If the crop is winterkilled, spring vium and eolian deposits. Included in mapping are small,
wheat can be seeded. Generally precipitation is too low long and narrow areas of sand and gravel deposits and
for beneficial use of fertilizer. small areas of soils that are subject to occasional flooding.
Such practices as stubble mulch farming, striperopping, Some small leveled areas are also included.
and minimum tillage are needed to control soil blowing Typically the surface layer of this Nunn soil is grayish
and water erosion. brown clay loam about 9 inches thick. The subsoil is light
The potential native vegetation is dominated by blue brownish gray clay loam about 14 inches thick. The upper
grama Several mid grasses, such as western wheatgrass part of the substratum is clay loam. The lower part to a
and needleandthread, are also present. Potential produc- depth of 60 inches is sandy loam.
tion ranges from 1,600 pounds per acre in favorable years Permeability is moderately slow. Available water
to 1,000 pounds in unfavorable years. As range condition capacity is high. The effective rooting depth is 60 inches
deteriorates, the mid grasses decrease; blue grama, buf- or more. Surface runoff is slow, and the erosion hazard is
falograss, snakeweed, yucca, and fringed sage increase; low.
and forage production drops. Undesirable weeds and an- This soil is used almost entirely for irrigated crops. It
nuals invade the site as range condition becomes poorer. is suited to all crops commonly grown in the area, includ-
Management of vegetation on this soil should be based ing corn, sugar beets, beans, alfalfa, small grain, potatoes,
on taking half and leaving half of the total annual produc- and onions. An example of a suitable cropping system is 3
tion. Seeding is desirable if the range is in poor condition. to 4 years of alfalfa followed by corn, corn for silage,
Sideoats grama, little bluestem, western wheatgrass, blue sugar beets, small grain, or beans. Few conservation prac-
grams, pubescent wheatgrass, and crested wheatgrass are tices are needed to maintain top yields.
suitable for seeding. The grass selected should meet the All methods of irrigation are suitable, but furrow ir-
seasonal requirements of livestock. It can be seeded into rigation is the most. common. Barnyard manure and com-
a clean, firm sorghum stubble, or it can be drilled into a mercial fertilizer are needed for top yields.
firm prepared seedbed. Seeding early in spring has Windbreaks and environmental plantings of trees and
proven most successful. shrubs commonly grown in the area are generally well
Windbreaks and environmental plantings of trees and suited to this soil. Cultivation to control competing
shrubs commonly grown in the area are generally well vegetation should be continued for as many years as
suited to this soil. Cultivation to control competing possible following planting. Trees that arc best suited and
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- Lion. 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
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
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 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, IlIc 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
„ . 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.
I
WELD COUNTY, COLORADO, SOUTHERN PART 101
TABLE 6.--BUILDING SITE DEVELOPMENT--Continued
Soil name and 1 Shallow Dwellings Dwellings Small Local roads
map symbol 1 excavations without with commercial and streets
basements basements buildings____
19 ;Moderate: Severe: Severe: Severe: Severe:
Colombo ; floods. floods. floods. floods. floods.
20 ;Slight Moderate: Moderate: Moderate: Moderate:
Colombo I low strength. low strength. low strength. low strength,
frost action.
21, 22 ;Severe: Moderate: Slight Moderate: Severe:
Dacono cutbanks cave. low strength, low strength, shrink-swell ,
shrink-swell. shrink-swell. low strength.
23, 24 Slight Moderate: Moderate: Moderate: Moderate:
Fort Collins low strength. low strength, low strength. low strength.
shrink-swell.
25, 26 Severe: Severe: Severe: Severe: Severe:
Haverson floods. floods. floods. floods. floods.
27, 28 Severe: Severe: Severe: Severe: Severe:
Heldt too clayey. shrink-swell, shrink-swell, shrink-swell, shrink-swell ,
low strength. low strength. low strength. low strength.
29, 30 Slight Moderate: Moderate: Moderate: Moderate:
Julesburg low strength. low strength. low strength. low strength,
frost action.
31 , 32 Slight Moderate: Moderate: Moderate: Moderate:
Kim low strength. low strength. low strength. low strength.
33, 34 Slight Moderate: Moderate: Moderate: Moderate:
Kim low strength. low strength. low strength, low strength.
.r.- slope.
J5*:
Loup Severe: Severe: Severe: Severe: Severe:
wetness, wetness, wetness, wetness, wetness.
cutbanks cave. floods. floods. floods.
Boel Severe: Severe: Severe: Severe: Severe:
wetness, wetness, wetness, wetness, wetness,
floods, floods. floods. floods. floods.
cutbanks cave.
36':
Midway Severe: Severe: Severe: Severe: Severe:
too clayey. shrink-swell, shrink-swell, slope, shrink-swell ,
low strength. low strength. shrink-swell , low strength.
low strength.
•
Shingle Severe: Severe: Severe: Severe: Severe:
depth to rock. depth to rock. depth to rock. depth to rock, depth to rock.
slope.
37 Severe: Moderate: Severe: Moderate: Moderate:
• Nelson depth to rock. depth to rock, depth to rock. depth to rock, depth to rock,
low strength. low strength. low strength.
38 Severe: Moderate: Severe: Moderate: Moderate:
Nelson depth to rock. depth to rock, depth to rock. slope, depth to rock,
low strength. depth to rock, low strength.
low strength.
39, 40, 41 , 42,
43 Moderate: Severe: Severe: Severe: Severe:
Nunn too clayey. I shrink-swell , shrink-swell, shrink-swell , shrink-swell ,
low strength. low strength. low strength. low strength.
See footnote at end of table.
WELD COUNTY, COLORADO, SOUTHERN PART 113
TABLE 9.--WATER MANAGEMENT--Continued
Soil name and Pond Embankments, Drainage Irrigation Terraces Grassed
map symbol reservoir dikes, and and waterways
areas levees diversions
40 Favorable Compressible, Peres slowly, Percs slowly, Percs slowly--- Favorable.
Nunn shrink-swell, slope. slope.
hard to pack.
41 Favorable Compressible, Peres slowly--- Peres slowly--- Peres slowly--- Favorable.
Nunn shrink-swell,
hard to pack.
42 Favorable Compressible, Peres slowly, Percs slowly, Peres slowly--- Favorable.
Nunn shrink-swell, slope. slope.
hard to pack.
43 Favorable Compressible, Percs slowly--- Peres slowly--- Percs slowly--- Favorable.
Nunn shrink-swell,
hard to pack.
44 Seepage, Piping, Slope Soil blowing, Erodes easily, Erodes easily.
Olney slope, low strength. droughty. piping.
45 Seepage, Piping, Slope Soil blowing, Erodes easily, Erodes easily.
Olney slope. low strength. droughty, piping.
slope.
46 Seepage, Piping, Favorable Favorable Erodes easily, Erodes easily.
Olney slope, low strength. piping.
47, 48 Seepage, Piping, Slope Slope, Erodes easily, Erodes easily.
Olney slope. low strength. erodes easily. piping.
49 Seepage Piping Favorable Soil blowing--- Too sandy, Erodes easily.
piping.
i.�Osgood
0 Seepage Piping, Favorable Droughty Erodes easily, Erodes easily.
Otero seepage. piping.
51 , 52, 53 Seepage, Piping, Slope Slope, Erodes easily, Erodes easily.
Otero slope. seepage. erodes easily, piping.
droughty.
54 Seepage Piping, Favorable Favorable Piping Favorable.
Paoli low strength.
55 Seepage Piping, Slope Slope Piping Favorable.
Paoli low strength.
56 Depth to rock Low strength, Depth to rock, Rooting depth, Depth to rock, Rooting depth,
Renohill thin layer, percs slowly, slow intake. percs slowly. percs slowly.
compressible.
57 ;Slope, Low strength, Slope, Slope, Depth to rock, Rooting depth,
Renohill depth to rock. thin layer, depth to rock, rooting depth, percs slowly. percs slowly.
compressible. percs slowly. slow intake.
58, 59 Slope , Low strength, Depth to rock, Slope, Depth to rock Rooting depth.
Shingle depth to rock. thin layer. slope. rooting depth.
60*:
Shingle Slope, Low strength, Depth to rock, Slope, Depth to rock Rooting depth.
depth to rock. thin layer. slope. rooting depth.
Renohill Slope, Low strength, Slope, Slope, Depth to rock, Rooting depth,
depth to rock. thin layer, depth to rock, rooting depth, percs slowly. percs slowly.
compressible. percs slowly. slow intake.
51 Depth to rock, Erodes easily, Not needed Droughty, Depth to rock, Rooting depth,
Tassel slope. thin layer. rooting depth. erodes easily. erodes easily.
52 ',Depth to rock, Piping, Slope, Slope, Depth to rock, Rooting depth,
seepage. thin layer. rooting depth. rooting depth, piping, soil blowing.
Terry soil blowing. soil blowing.
See footnote at end of table.
130 SOIL SURVEY
TABLE 13.--PHYSICAL AND CHEMICAL PROPERTIES OF SOILS--Continued
/^.
Risk of corrosion Erosion',Wind
Soil name and ;Depth Permea- Available Soil Salinity; Shrink- factors;erodi-
map symbol ; bility water reaction swell ;Uncoated Concrete ;bility
capacity ;potential 1 steel K T group
In In/hr In/in Pil Mmhos/em;
29, 30 ; 0-12 2.0-20 0.11-0.15 6.6-7.8 <2 ;Lou Moderate Low 0.24 5 3
Julesburg 112-27 2.0-20 0.11-0.15 6.6-7.8 <2 ;Low Moderate Low 0.24
127-60 >6.0 0.05-0.13 6.6-7.8 <2 ;Low Moderate Low 0.20
31 , 32, 33, 34 i 0-12 0.6-2.0 0.16-0.18 7.9-8.4 <2 ;Low Moderate Low 0.32 5 4L
Kim 112-60 0.6-2.0 0.15-0.17 7.9-8.4 <2 Low Moderate Low 0.32
35*:
Loup 0-16 6.0-20 0.10-0.14 6.6-8.4 <2 Low High Low 0.17 5 2
16-60 6.0-20 0.06-0.08 7.4-8.4 <2 Low High Low 0.17
Boel 0-14 6.0-20 0.10-0.12 6.6-8.4 <2 Low High Low 0.17 5 2
14-60 6.0-20 i 0.05-0.07 6.6-8.4 <2 Low High Low 0. 17
36*: 1 1
Midway 0-13;0.06-0.2 0.12-0.17 7.9-9.0 2-8 High High Low 0.43 1 4
13 1 --- --- ---
Shingle 1 0-6 0.6-2.0 0.16-0.18 7.4-9.0 <2 Low High Lou 0.32 2 4L
6-18 0.6-2.0 0.16-0.21 7.9-9.0 <2 Moderate High Low 0.49
37, 38 0-9 2.0-6.0 0.13-0.15 7.9-8.4 <2 Low High Low 0.20 2 3
Nelson i 9-30 2.0-6.0 0.11-0.13 7.9-8.4 <2 Low High Low 0.20
30 --- --- ---
1
39, 40, 41 , 42 0-9 0.2-2.0 0. 15-0.20 6.6-7.8 <2 Moderate Moderate Low 0.24 5 6
Nunn 9-29 0.06-0.6 0.15-0.18 7.4-8.4 <2 High High Low 0.28
29-60 0.2-2.0 0.10-0.18 7.4-8.4 <2 Moderate High Low 0.24
Pa'
'a3 0-9 2.0-6.0 0.10-0.14 6.6-7.8 <2 Low Moderate Low 0.15 5 3
Nunn 9-29 0.06-0.6 0.15-0.18 7.4-8.4 <2 High High Low 0.28
29-60 0.2-2.0 0.10-0.18 7.4-8.4 <2 Moderate High Low 0.24
44, 45 0-10 6.0-20 0.06-0.10 6.6-7.8 <2 Low Low Low 0. 17 5 2
Olney 10-20 0.6-2.0 0.13-0.15 6.6-7.8 <2 Moderate High Low 0.24
20-25 0.6-6.0 0.11-0.15 7.9-8.4 <2 Low High Low 0.24
25-60 2.0-6.0 0.06-0.13 7.9-8.4 <2 Low High Low 0.20
46, 47, 48 0-10 0.6-6.0 0.11-0.15 6.6-7.8 <2 Low Moderate Low 0.20 5 3
Olney 10-2Dj 0.6-2.0 0.13-0.15 6.6-7.8 <2 Moderate High Low 0.24
20-251 .0.6-6.0 0.11-0.15 7.9-8.4 <2 Low High Low 0.24
25-601 2.0-6.0 0.06-0.13 7.9-8.4 <2 Low High Low 0.20
49 0-22; 6.0-20 0.05-0.08 6.6-7.3 --- Low Lou Low 0. 10 5 1
Osgood 22-341 2.0-6.0 0.10-0.13 6.6-7.3 --- Low Low Low 0.17
34-601 6.0-20 0.06-0.08 6.6-8.4 <2 Low Moderate Low 0. 10
50, 51 , 52, 53 0-121 6.0-20 0.09-0.13 7.4-8.4 <2 Low High Low 0. 10 5 2
Otero 12-601 6.0-20 0.08-0.12 7.4-8.4 <4 Low High Low 0.10
54, 55 0-201 0.6-2.0 0.16-0.18 6.6-7.3 --- Low Moderate Low 0.20 5 5
Paoli 20-251 >6.0 0.14-0.17 7.4-7.8 <2 ;Low High Low 0.20
25-601 >6.0 0.12-0.14 7.4-8.4 <2 1Low High Low 0.20
56, 57 ; 0-9 ; 0.2-0.6 0.17-0.21 6.6-7.8 <2 'Moderate High Low 0.37 3
6
Renohill 1 9-3210.06-0.2 10.14-0. 16 6.6-8.4 <2 ;High High Low 0.32
32 1 --- I --- --- ---
58, 59 i 0-6 0.6-2.0 0.16-0.18 7.4-9.0 <2 ;Low High Low 0.32 2
4L
Shingle 1 6-18 0.6-2.0 0.16-0.21 7.9-9.0 <2 ;Moderate High Low 0.49
18 --- 1 ___ ___ ___
60*:
Shingle , 1 0-6 0.6-2.0 10.16-0.18 7.4-9.0 <2 Low High Low 0.32 2 4L
1 6-18 0.6-2.0 10.16-0.21 7.9-9.0 <2 Moderate High Low 0.49
_
See footnote at end of table.
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