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• CO-CPA-1 • U.~ Dcpt. of Agriculture
<br />4/22 Soil Conservation Service
<br />(180-12-11)
<br />• CCNSERVATIQI PLAN MAP AND
<br />SOIL AND CAPABILITY MAP LEGEND SHEET
<br />T)ifferent kinds of soilr range sites, or woodland sites are separated on thr,
<br />map by solid black lines, 4lithln o¢ch area is ar, identil'yint• syni:~ol or
<br />name, The following symbols are shown on your map: -~ _
<br />Symbol or Site Name
<br />21-Graypolnt gravelly sandy loam, wet. This is a
<br />deep, wet soil on broad terraces and alluvial tans at
<br />elevations of 7,600 to 7,800 feet. It formed in alluvium
<br />derived principally Irom basalt. Tho average annual prc-
<br />cipilation is about 7 inches, the average annual air tem-
<br />perature is about 41 degrees F, and the frost-free
<br />season lasts about 95 days. Slopes are 0 to 1 percent.
<br />Included in mapping are small areas of LaJara loam,
<br />Quamon gravelly sandy loam, and San Arcacio sandy
<br />loam.
<br />Typically, the surface layer is brown gravelly sandy
<br />loam about 5 inches thick. The subsoil is yellowish
<br />brown and pale brown gravelly sandy clay loam about 13
<br />inches thick. The substratum, to a depth of more than 60
<br />inches, is sand and gravel.
<br />A seasonal high water table is within 1 1 /2 l0 2 leet of
<br />the surface during the growing season because of seep-
<br />age from irrigation ditches. Permeability is moderate.
<br />Available water capacity is low. Runoff is slow, and the
<br />erosion hazard is slight. Effective rooting depth is 60
<br />inches or more.
<br />The soil is used primarily for irrigated pasture and
<br />hayland and for range. Some areas are irrigated crop-
<br />land. Crops are barley, oats, and alfalfa. Successful
<br />cropping of this soil requires the application of commer-
<br />cial fertilizers and manure, and the return of plant resi-
<br />dues. Irrigation methods suitable for this soil are sprinkler
<br />and border. Sprinkler irrigation Is well suited to most
<br />crops. Border irrigation is suited to alfalfa, small grains,
<br />and pasture. Where drainage is provided, the water table
<br />can be controlled and subirrigalion can be used for crop
<br />production.
<br />The potential native vegetation is dominated by alkali
<br />sacaton, alkali cordgrass, creeping wildrye, wedge grass,
<br />bluegrass, sedges, and rushes. Greasewood, rabbit-
<br />brush, and cinquefoil are sparse. If the range deterio-
<br />rates, the proportion of desirable forage species de-
<br />creases and the proportion of sedges, rushes, toxtail
<br />barley, greasewood, and cinquefoil increases. Undesira-
<br />ble weeds and annual plants invade and become abun-
<br />dant if the range condition becomes poorer.
<br />Sending is generally not advisable because of the
<br />poor condition of the soil and high water table, the low
<br />Ger:eralized Desci~,tians
<br />(Ilct.ntlnrl desr.rflil.inn:. :,rr av:~;lnhlr.ii•
<br />,your Soil Con:;nrv~ t.in,~ J~~rv;cc ef1'Scc.)
<br />rainfall, and the extreme cost of land preparation. Con-
<br />trolling excess water, renovating, deferring and rotating
<br />grazing, cross fencing, and controlling brush will prevent
<br />range deterioration and promote the growth of desirably`
<br />plant species. ~~
<br />Rangeland wildlife including antelope, jackrabbit, cot-
<br />tontail, horned lark, and lark bunting are suited to the
<br />grassland habitat that develops on this soil. Proper live-
<br />stock grazing, fencing which allows for tree movement of
<br />antelope, and livestock water facilities increase range-
<br />land wildlife populations. Where water is available, shal-
<br />low water areas can bo developed for wetland wildlife.
<br />The greatest limitation to urban development is the
<br />high water table. Caving of cutbanks is a hazard when
<br />oxcavating. Septic tanks and sanitary landlills will con-
<br />taminate ground water because of the high water !able
<br />and gravelly substratum. Alternate systems for waste
<br />disposal such as community sewage systems should be
<br />provided. The capability subclasses are IVw irrigated and
<br />Vlw nonirrigated.
<br />RANGE SITE: SALT MEADOW
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