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Non-Technical Descriptions
Soil Survey Area: 618 WELD COUNTY, COLORADO, SOUTHERN PART
Map unit: 16 Colby loam, 3 to 5 percent slopes
Description Category: SOI
This is a deep well drained soil on upland hill and ridges. It formed in calcareous eolian
deposits.Typically the surface is a pale brown loam about 10 in.thick.The underlying
material is a very pale brown silt loam to a depth of 60 in. Permeability is
moderate.Available water holding capacity is high.The effective rooting depth is 60 in.
or more. Surface runoff is medium to rapid,and the hazard of water erosion is moderate.
Map unit: 27 Heldt silty clay, 1 to 3 percent slopes
Description Category: SOI
The Heldt soil is a deep, moderately well drained soil. It is formed on plains in alluvial
sediment derived from shale. The surface is a silty clay.The subsoil and the underlying
material is clay loam. The soils have slow permeability. Their available
water holding capacity is high. Roots penetrate to 60 inches or more. Runoff is
.-� medium and the erosion hazard due to wind is moderate.
Map unit: 28 Heldt silty clay, 3 to 5 percent slopes
Description Category: SOI
The Heldt soil is a deep,moderately well drained soil. It is formed on plains in alluvial
sediment derived from shale. The surface is a silty clay.The subsoil and the underlying
material is clay loam. The soils have slow permeability. Their available
water holding capacity is high. Roots penetrate to 60 inches or more. Runoff is
medium and the erosion hazard due to wind is moderate.
Map unit: 4 Aquolls and Aquepts, Flooded
Description Category: SOI
This map unit is in depressions in smooth plains and along bottoms of natural
drainageways throughout the survey area.This unit consists of 55 percent Aquolls and
25 percent Aquepts soils.These soils are deep, poorly drained.They formed in recent
alluvi
um. The soils have a mildly to moderately alkaline loamy or clayey surface layer and
underlying material that extends to a depth of 60 inches or more.The water table is at
or near the surface,creating a hydric soil condition.The erosion hazard due to w
ind is low.
Tuesday,October 28,2003 Page 1 of 3
Map unit: 42 Nunn clay loam, 1 to 3 percent slopes
Description Category: SOI
The Nunn soil is a deep,well drained soil. It is formed on terraces and smooth plains in
mixed eolian and alluvial deposits.The surface is a clay loam.The underlying material
is clay loam and sandy loam. The soils have moderately slow permeability. T
heir available water holding capacity is high. Roots penetrate to 60 inches or more.
Runoff is slow and the erosion hazard due to wind is low.
Map unit: 57 Renohill clay loam, 3 to 9 percent slopes
Description Category: 801
The Renohill soil is a moderately deep,well drained soil. It is formed on plains in
residuum from shale. The surface is a clay loam as are the subsoil and the underlying
material. The soils have slow permeability. Their available water holding capacit
y is moderate. Roots penetrate to the depth of the shale,which ranges from 20 to 40
inches. Runoff is medium and the erosion hazard due to wind is moderate.
Map unit: 59 Shingle loam, 3 to 9 percent slopes
Description Category: SOI
The Shingle soil is a shallow,well drained soil. It is formed on plains in residuum from
shale. The surface is a loam.The underlying material is a clay loam. The soils have
moderate permeability. Their available water holding capacity is low. Roots
penetrate to the depth of the shale,which ranges from 10 to 20 inches. Runoff is
medium and the erosion hazard due to wind is moderate.
Map unit: 64 Thedalund loam, 1 to 3 percent slopes
Description Category: SOI
The Thedalund soil is a moderately deep,well drained soil. It is formed on plains in
residuum from shale material. The surface is a loam.The underlying material is a
loam. The soils have moderate permeability. Their available water holding capacity i
s moderate. Roots penetrate to the depth of the shale,which ranges from 20 to 40
inches. Runoff is medium and the erosion hazard due to wind is moderate.
Map unit: 65 Thedalund loam, 3 to 9 percent slopes
Description Category: SOI
The Thedalund soil is a moderately deep,well drained soil. It is formed on plains in
residuum from shale material. The surface is a loam.The underlying material is a
loam. The soils have moderate permeability. Their available water holding capacity i
s moderate. Roots penetrate to the depth of the shale,which ranges from 20 to 40
inches. Runoff is medium and the erosion hazard due to wind is moderate.
Tuesday,October 28,2003 Page 2 of 3
Map unit: 82 Wiley-Colby complex, 1 to 3 percent slopes
Description Category: SOI
This map unit is on smooth plains.This unit consists of 60 percent Wiley and 30
percent Colby soils. The Wiley soil is a deep,well drained soil. It formed in calcareous
eolian deposits.The surface is a silt loam.The subsoil is a silty clay loam.The s
ubstratum to a depth of 60 inches or more is a silty clay loam.This soil has a
moderately slow permeability.The available water holding capacity is high. Roots
penetrate to a depth of 60 inches or more. Runoff is slow and the erosion hazard due to
wind i
s high. The Colby soil is a deep,well drained soil. It formed in calcareous eolian
deposits.The surface is a loam.The underlying material to a depth of 60 inches or
more is a silt loam.This soil has a moderate permeability.The available water holding
capacity is high. Roots penetrate to a depth of 60 inches or more. Runoff is slow and
the erosion hazard due to wind is high.
Map unit: 83 Wiley-Colby complex, 3 to 5 percent slopes
Description Category: SOI
• This map unit is on smooth plains.This unit consists of 60 percent Wiley and 30
percent Colby soils. The Wiley soil is a deep,well drained soil. It formed in calcareous
eolian deposits.The surface is a silt loam.The subsoil is a silty clay loam.The s
ubstratum to a depth of 60 inches or more is a silty clay loam.This soil has a
moderately slow permeability.The available water holding capacity is high. Roots
penetrate to a depth of 60 inches or more.Runoff is slow and the erosion hazard due to
wind i
s high. The Colby soil is a deep,well drained soil. It formed in calcareous eolian
deposits.The surface is a loam.The underlying material to a depth of 60 inches or
more is a silt loam.This soil has a moderate permeability.The available water holding
capacity is high. Roots penetrate to a depth of 60 inches or more.Runoff is slow and
the erosion hazard due to wind is high.
Tuesday, October 28,2003 Page 3 of 3
) ) )
Table J1 b. - Physical Properties of the Soils
Weld County,Colorado,Southern Part
Entries under"Erosion Factors--T"apply to the entire profile. Entries under"Wind Erodibility Group"and"Wind Erodibility Index"apply only to the surface layer. Absence of an entry indicates that data
were not estimated.
Erosion Factors Wind Wind
Map Symbol Moist Available Linear
y Depth Sand Silt Clay Bulk Permeability Water Extensi- Matter ae t biliEroty
and Soil Name p (Ksat) Kw Kf T bility bility
Density Capacity bility Group Index
In Pct Pct Pct g/cc In/Hr In/In Pct Pct
4:
Aquolls 0-8 --- --- --- 1.20-1.40 0.2-6 --- --- 2.0-5.0 --- --- 5 8 0
8-60 -- -- 15-35 1.20-1.50 0.06-6 0.07-0.10 3.0-5.9 1.0-2.0 .28 .28
Aquepts, Flooded 0-8 --- --- --- 1.20-1.40 0.2-6 --- --- 0.0-1.0 --- --- 5 8 0
8-60 --- --- 15-35 1.20-1.50 0.06-6 0.07-0.10 3.0-5.9 0.0-0.5 .28 .28
16:
Colby 0-7 --- --- 15-27 1.25-1.40 0.6-6 0.14-0.18 0.0-2.9 0.5-2.0 .37 .37 5 4L 86
7-60 --- --- 18-27 1.15-1.30 0.6-2 0.15-0.20 0.0-2.9 0.5-1.0 .43 .43
27:
Heldt 0-7 -- --- 40-55 1.15-1.30 0.06-0.2 0.14-0.17 6.0-8.9 0.5-1.0 .24 .24 5 4 86
7-60 --- -- 40-55 1.15-1.30 0.06-0.2 0.14-0.17 6.0-8.9 0.0-0.5 .28 .28
28:
Heldt 0-7 --- --- 40-55 1.15-1.30 0.06-0.2 0.14-0.17 6.0-8.9 0.5-1.0 .24 .24 5 4 86
7-60 --- --- 40-55 1.15-1.30 0.06-0.2 0.14-0.17 6.0-8.9 0.0-0.5 .28 .28
42: )
Nunn 0-9 --- --- 27-35 1.25-1.40 0.2-0.6 0.17-0.20 3.0-5.9 2.0-3.0 .20 .20 5 6 48
9-29 --- --- 35-50 1.35-1.40 0.06-0.2 0.15-0.18 6.0-8.9 0.5-2.0 .28 .32
29-60 --- -- 15-25 1.35-1.45 2-6 0.11-0.14 0.0-2.9 0.0-0.5 .20 .24
57:
Renohill 0-9 --- --- 27-34 1.25-1.40 0.2-0.6 0.17-0.20 3.0-5.9 1.0-2.0 .20 .20 3 6 48
9-32 --- --- 35-55 1.15-1.40 0.06-0.2 0.14-0.20 6.0-8.9 0.5-1.0 .24 .24
32-36 --- --- --- --- 0.06-0.2 --- --- --- -- ---
59:
USDA Natural Resources
a. Conservation Service Distribution Generation Date:2/26/2002 Page 1 of 2
) ) )
Table Jib. - Physical Properties of the Soils - Continued
Weld County,Colorado,Southern Part
Map Symbol Moist Available Linear Erosion Factors Wind Wind
y Depth Sand Silt Clay Bulk Permeability Water Extensi- Organic Erodi- Erodi-
and Soil Name (Ksat) Matter Kw Kf T bility bility
Density Capacity bility Group Index
In Pct Pct Pct g/cc In/Hr In/In Pct Pct
59:
Shingle 0-6 --- --- 13-23 1.25-1.40 0.6-6 0.14-0.17 0.0-2.9 0.5-1.0 .37 .37 2 4L 86
6-18 --- --- 27-34 1.25-1.40 0.2-0.6 0.17-0.20 3.0-5.9 0.0-0.5 .28 .28
18-22 -- --- --- --- 0.06-0.2 --- --- -- --- -_
64: 1
Thedalund 0-8 --- --- 15-20 1.25-1.40 0.6-6 0.14-0.17 0.0-2.9 0.5-1.0 .37 .37 3 4L 86
8-29 --- --- 19-35 1.35-1.45 0.6-2 0.16-0.18 3.0-5.9 0.0-0.5 .37 .37
29-33 -- -- --- --- 0.06-2 --- --- -- --- ---
65:
Thedalund 0-8 --- --- 15-20 1.25-1.40 0.6-6 0.14-0.17 0.0-2.9 0.5-1.0 .37 .37 3 4L 86
8-29 --- --- 19-35 1.35-1.45 0.6-2 0.16-0.18 3.0-5.9 0.0-0.5 .37 .37
29-33 -- --- -- --- 0.06-2 --- --- --- --- ---
82:
Wiley 0-11 --- --- 15-27 1.15-1.30 0.6-2 0.15-0.20 0.0-2.9 0.5-1.0 .43 .43 5 4L 86
11-60 --- --- 18-35 1.15-1.30 0.6-2 0.19-0.21 3.0-5.9 0.0-0.5 .32 .32
60-64 --- --- 18-35 1.15-1.40 0.6-2 0.16-0.21 0.0-2.9 0.0-0.5 .37 .37
Colby 0-7 --- --- 15-27 1.25-1.40 0.6-6 0.14-0.18 0.0-2.9 0.5-2.0 .37 .37 5 4L 86
7-60 --- --- 18-27 1.15-1.30 0.6-2 0.15-0.20 0.0-2.9 0.51.0 .43 A3 ,
83:
Wiley 0-11 --- --- 15-27 1.15-1.30 0.6-2 0.15-0.20 0.0-2.9 0.5-1.0 .43 .43 5 4L 86
11-60 --- --- 18-35 1.15-1.30 0.6-2 0.19-0.21 3.0-5.9 0.0-0.5 .32 .32
60-64 --- --- 18-35 1.15-1.40 0.6-2 0.16-0.21 0.0-2.9 0.0-0.5 .37 .37
Colby 0-7 --- --- 15-27 1.25-1.40 0.6-6 0.14-0.18 0.0-2.9 0.5-2.0 .37 .37 5 4L 86
7-60 --- --- 18-27 1.15-1.30 0.6-2 0.15-0.20 0.0-2.9 0.5-1.0 .43 .43
USDA Natural Resources
Conservation Service Distribution Generation Date: 2/26/2002 Page 2 of 2
Table J2. - Chemical Properties of the Soils
Weld County,Colorado, Southern Part
Absence of an entry indicates that data were not estimated.
Cation Effective Calcium Sodium
Map Symbol Depth Exchange Cation Soil Carbon- Gypsym Salinity Adsorp-
and Soil Name Capacity Exchange Reaction ate lion
Capacity Ratio
In meq/100 g meq/100 g pH Pct Pct mmhos/cm
4:
Aquolls 0-8 --- --- 7.4-9.0 0-10 0 8.0-16.0 0-5
8-60 10-25 --- 7.9-9.0 0-10 0 8.0-16.0 0-5
Aquepts,Flooded 0-8 --- --- 7.4-9.0 0-10 0 8.0-16.0 0-5
8-60 10-25 --- 7.9-9.0 0-10 0 8.0-16.0 0-5
16:
Colby 0-7 5.0-20 --- 7.4-8.4 0-5 0 0.0 0
7-60 5.0-20 --- 7.4-8.4 5-15 0 0.0 0
27:
Heldt 0-7 25-45 --- 7.4-9.0 0 0 0.0-2.0 1-5
7-60 20-45 --- 7.4-9.0 5-10 0-1 0.0-4.0 1-10
28:
,..-.,,Heldt 0-7 25-45 --- 7.4-9.0 0 0 0.0-2.0 1-5
7-60 20-45 --- 7.4-9.0 5-10 0-1 0.0-4.0 1-10
42:
Nunn 0-9 20-35 -- 6.1 -7.8 0 0 0.0 0
9-29 15-30 --- 6.1 -8.4 0-15 0 0.0-2.0 0
29-60 5.0-15 --- 7.4-8.4 4-15 0 0.0-2.0 0
57:
Renohill 0-9 20-30 -- 6.6-7.8 0 0 0.0 0
9-32 20-45 --- 6.6-7.8 0-5 0 0.0 0
32-36 --- --- ---
59:
Shingle 0-6 5.0-15 --- 7.4-8.4 5-10 0 0.0-2.0 0
6-18 10-20 --- 7.4-8.4 5-15 0 0.0-2.0 0
18-22 --- --- ---
64:
Thedalund 0-8 5.0-15 --- 7.4-8.4 0-5 0 0.0-2.0 0
8-29 10-25 --- 7.9-8.4 5-15 0 0.0-8.0 0
29-33 --- --- ---
65:
Thedalund 0-8 5.0-15 --- 7.4-8.4 0-5 0 0.0-2.0 0
8-29 10-25 --- 7.9-8.4 5-15 0 0.0-8.0 0
29-33 --- --- ---
2:
USDA Natural Resources
Conservation Service Distribution Generation Date:2/26/2002 Page 1 of 2
Table J2. - Chemical Properties of the Soils - Continued
Weld County,Colorado,Southern Part
Cation Effective Calcium Sodium
Map Symbol Depth Exchange Cation Soil Carbon- Gypsym Salinity Adsorp-
and Soil Name Capacity Exchange Reaction ate tion
Capacity Ratio
In meq/100 g meq/100 g pH Pct Pct mmhos/cm
82:
Wiley 0-11 5.0-20 --- 7.4-8.4 0-10 0 0.0 0
11-60 10-20 --- 7.9-8.4 5-10 0 0.0 0
60-64 5.0-20 --- 7.9-9.0 5-15 0 0.0-2.0 0
Colby 0-7 5.0-20 --- 7A-8A 0-5 0 0.0 0
7-60 5.0-20 --- 7A-8A 5-15 0 0.0 0
83:
Wiley 0-11 5.0-20 --- 7.4-8.4 0-10 0 0.0 0
11-60 10-20 --- 7.9-8.4 5-10 0 0.0 0
60-64 5.0-20 --- 7.9-9.0 5-15 0 0.0-2.0 0
Colby 0-7 5.0-20 --- 7.4-8.4 0-5 0 0.0 0
7-60 5.0-20 --- 7.4-8.4 5-15 0 0.0 0
USDA Natural Resources
Conservation Service Distribution Generation Date:2/26/2002 Page 2 of 2
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