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Home My WebLink About972025.tiff SHEET NO. 20 WELD COUNTY,COLORADO, SOUTHERN PART in (LONGMONT QUADRANGLE) o 105°00• CBERTHOUD QUAD) a R eR w xcg� t " .5zr g l r _ _. ,g,,,t�., (Jo nsel sheet z0) gif° � p) 9 .g �`gq S y# _ yi t�� r i '� i '42 42 L05'00' a'c a C j ;Y a [e8 a- 1.1' --Y441 in` r; 82 ' ' 'lze •4i c . RYt: st 40821'30' � �` i. r �, z is .. . � # ' � fi d' x P Y � �x n C °tit4t4d a t .fir 4 _ ,c az _.. ��.; ' s '- q $z - r ( i It x 3 a '� 142 \ + ,r:.,. ..-- ; 82�, `E'„ iffse kMead �.r.; r e \ i^..- i 4 n r r 841;8 = MEAD '`; _Sr > .,�— i 3 ..` . ESERVOQt ,�,, * i:444.-,--,.'48.. ' `E �"0CWv:VV� a' as l .. ` '"', �r ₹,, r- C 'a x� r�..�- 4'� �,.�; JJ 4 ''12,42 i �� T r �S x -� r <. tr a :r w .mss, 1 b�: c 4z 7�t ,..�,. n ,g S 'Cl- s ep. i,-.7 ., C01 r� ` , `•t ' ,,-----V..,:‘ ,- - N r5ry -� 8 i �+ : ' '1TIJ 82 y GO 5 1 _ _ i I >�.� 4s t,' -4311" '' - a § 42 �1 tr 'oria`� l �4 t M1� 5.0 a.,yy,a `' tf`d' -...":--.&'''' t f e4rw � N y i 27 ' 7 -.& .la .1;i4. "" 1e Rt ,I5". 'may '1A ._ w 27 t • k 82 , 1 •_, � ; `�'t tit• a7� �, 64 � r 3 rl 'i 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 h; erry. 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 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 br clay loam aobut 9 inches thick. The subsoil is light be attracted by establishing areas for nesting and escape bri, _,ish 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- e lower part to a depth of 60 inches is brown sandy ment, especially in areas of intensive agriculture. Range- land wildlife, for example, the pronghorn antelope, can be `Permeability is moderately slow. Available water attracted by developing livestock watering facilities, rapacity is high. The effective rooting depth is 60 inches managing livestock grazing, and reseeding where needed. Er more. Surface runoff is medium, and the erosion This soil has fair to poor potential for urban develop- azard 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 • only grown in the area, including corn, sugar beets, problems in dwelling and road construction. Those areas ns, alfalfa, small grain, potatoes; and onions. An exam- that have loam or sandy loam in the lower part of the • of a suitable cropping system is 3 to 4 years of alfalfa substratum are suitable for septic tank absorption fields llowed by corn, corn for silage, sugar beets, small grain, and foundations. Some areas of this soil are adjacent to beans..Generally such characteristics as the high clay streams and are subject to occasional flooding. The poten- ttent or the rapidly permeable substratum slightly tial is fair for such recreational development as camp and rict some crops. picnic areas and playgrounds. Capability subclass IIe ir- methods of irrigation are suitable, but furrow ir- rigated, IIIc nonirrigated; Clayey Plains range site. tion is the most common. Proper irrigation water 43—Nunn loamy sand, 0 to 1 percent slopes. This is a gement is essential. Barnyard manure and commer- deep, well drained soil on terraces at elevations of 4,700 ertilizer are needed for top yields. to 4,900 feet. It formed in alluvium along Box Elder nonirrigated areas most of the acreage is in small Creek. Included in mapping are small areas of soils that and it is summer fallowed in alternate years. have a loamy subsoil and small areas of soils that are sub- r wheat is the principal crop. The predicted average ject to rare flooding. .'is 33 bushels per acre. If the crop is winterkilled, Typically the surface layer of this Nunn soil is brown .g wheat can be seeded. Generally precipitation is too loamy sand overburden about 9 inches thick. The subsoil or beneficial use of fertilizer. is dark to very dark grayish brown clay loam about 21 ble mulch fanning, striperopping, and minimum til- inches thick. The substratum to a depth of 60 inches is needed to control soil blowing and water erosion. loamy very fine sand, loamy sand, or sand. 972025 52 _ SOIL SURVEY the limited capacity of this soil to support a load. Capa- Management of vegetation on this soil should be based bility class I irrigated. on taking half and leaving half of the total annual produc- 82—Wiley-Colby complex, 1 to 3 percent slopes. This tion. Seeding is desirable if the range is in poor condition. nearly level map unit is on smooth plains in the western Sideoats grama, little bluestem, western wheatgrass, blue part of the survey area at elevations of 4,850 to 5,000 grama, pubescent wheatgrass, and crested wheatgrass are feet. The Wiley soil makes up about 60 percent of the suitable for seeding. The grass selected should meet the unit, and the Colby soil about 30 percent. About 10 per- seasonal requirements of livestock. It can be seeded into cent is Heldt silty clay and Weld loam. a clean, firm sorghum stubble or it can be drilled into a The Wiley soil is deep and well drained. It formed in firm prepared seedbed. Seeding early in spring has calcareous eolian deposits. Typically the surface layer is proven most successful. pale brown silt loam about 11 inches thick. The subsoil is Windbreaks and environmental plantings are generally pale brown silty clay loam about 23 inches thick. The sub- well suited to these soils. Cultivation to control competing stratum to a depth of 60 inches is very pale brown silty vegetation should be continued for as many years as clay loam. possible following planting. Trees that are best suited and Permeability is moderately slow. Available water have good survival are Rocky Mountain juniper, eastern capacity is high. The effective rooting depth is 60 inches redcedar, ponderosa pine, Siberian elm, Russian-olive, and or more. Surface runoff is medium, and the erosion hackberry. The shrubs best suited are skunkbush sumac, hazard is moderate. lilac, Siberian peashrub, and American plum. The Colby soil also is deep and well drained and formed Openland wildlife, such as pheasant, mourning dove, in calcareous eolian deposits. Typically the surface layer and cottontail are best suited to these soils. Wildlife is pale brown loam about 7 inches thick. The underlying habitat development, including tree and shrub plantings material is very pale brown silt loam to a depth of 60 and grass plantings to serve as nesting areas, should be inches. successful without irrigation during most years. Under ir- Permeability is moderate. Available water capacity is rigation, good wildlife habitat can be established, benefit- high. The effective rooting depth is 60 inches or more. ing many kinds of openland wildlife. Surface runoff is medium, and the erosion hazard is The Wiley soil has only fair potential for urban and moderate. recreational development. Slow permeability, moderate This map unit is used for irrigated and nonirrigated shrink-swell potential, and limited bearing capacity cause cropland and for rangeland, wildlife habitat, and urban problems in dwelling and road construction. The Colby development. soil has good potential for urban and recreational develop- In irrigated areas these soils are suited to all crops ment. Road design can be modified to compensate for the commonly grown in the area, including corn, sugar beets, limited capacity of this soil to support a load. Capability beans, alfalfa, small grain, and onions. An example of a subclass IIe irrigated, IVe nonirrigated; Loamy Plains suitable cropping system is 3 to 4 years of alfalfa fol- range site. lowed by corn, corn for silage, sugar beets, small grain, or 83—Wiley-Colby complex, 3 to 5 percent slopes. This beans. Land leveling, ditch lining, and installing pipelines gently sloping map unit is on plains at elevations of 4,850 may be needed for proper water applications. to 5,000 feet. The Wiley soil makes up about 60 percent of All methods of irrigation are suitable, but furrow ir- the unit, and the Colby soil about 30 percent. About 10 rigation is the most common. Barnyard manure and com- percent is Heldt silty clay and Weld loam. mercial fertilizer are needed for top yields. The Wiley soil is deep and well drained. It formed in In nonirrigated areas these soils are suited to winter calcareous eolian deposits. Typically the surface layer is wheat, barley, and sorghum. .Most of the acreage is pale brown silt loam about 11 inches thick. The subsoil is planted to winter wheat. The predicted average yield is pale brown silty clay loam about 23 inches thick. The sub- 28 bushels per acre. The soil is summer fallowed in al- stratum to a depth of 60 inches is very pale brown silty ternate years to allow moisture accumulation. Generally clay loam. precipitation is too low for beneficial use of fertilizer. Permeability is moderately slow. Available water Stubble mulch farming, striperopping, and minimum til- capacity is high. The effective rooting depth is 60 inches lage are needed to control soil blowing and water erosion. or more. Surface runoff is medium to rapid, and the ero- Terracing also may be needed to control water erosion. sion hazard is moderate. The potential native vegetation is dominated by blue The Colby soil also is deep and well drained and formed grama. Several mid grasses such as western wheatgrass in calcareous eolian deposits. Typically the surface layer and needleandthread are also present. Potential produc- is pale brown loam about 7 inches thick. The underlying tion ranges from 1,600 pounds per acre in favorable years material is very pale brown silt loam to a depth of 60 to 1,000 pounds in unfavorable years. As range condition inches. deteriorates, the mid grasses decrease; blue grama, buf- Permeability is moderate. Available water capacity is falograss, snakeweed, yucca and fringed sage increase; high. The effective rooting depth is 60 inches or more. and forage production drops. Undesirable weeds and an- Surface runoff is medium to rapid, and the erosion hazard mats invade the site as range condition becomes poorer. is moderate. 9 20.?5 Hello