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~• CO-CPA-1 • U. S • pt. of Agriculture •4/82 Soil Conservation Service 0180-12-11) • CCNSERVATItIi PLAN HAP AND SOIL AND CAPABILITY HAP LF7;F2iD SHEET Different kinds of soil, range sites, or woodland sites are separated on the. map by solid black linen. Within each area ie an identifying symbol or name, The following eymbola era shown on `your map: Symbol or Site Name 50-Shawn {onm, wet. This Is a deep soli on alluvial fans and low. terraces at olovatlons of 7,600 to 0,400 feet. It formed in mixed alluvium derived mainly from igneous rock. Tho average annual preclpitalion is about 12 Inchon, the average annual air temperature Is about 41 degrees F, and the frost-free period lasts about 96 days. Slopes are 0 l0 1 percent. Included in, mapping are small arnas o! LaJara, La- manga, and Quamon Bolls. Typically, the upper part of the surfaco layer is dark grayish brown loam about 4 Inches thick. The lower part is dark grayish brown clay loam and loam about 20 inches thick. Tho undorlying material Is brown loam to a depth of 60 Inchon. Permeablllty Is moderate. Available water capacity is high. Runoii is slow, and the erosion hazard is slight. A seasonal high water table Is within 2 to 4 feet of the RANGE SITE: WET.[~ADOW Generali2ed Descriptions (Detailed descriptions are available it your Soil Conservation Service office.) surfaco during lho Irrigation ~nonson bocnuso of oxco::- sivo seepage from irrigation ditcl~os. Flooding occurs In about 3 years out of 10 In the spring when streams am high (fig. 13). Gffoctivo roofing depth is 60 inches or morn. This soil is used for native range and irrigated pasture and hayland, and a tow small areas are in irrigated small grains. Applications of commercial fertilizers and manure are commonly needed, and plant residues should be returned to the soil. Generally, all crops except legumes respond to nitrogen fertilizer, and legumes respond to phosphate fertilizer. Tho potential native vegetation on this soil is dominat- ed by western and slender wheatgrasses In the drier areas and by tutted hairgrass, bluejoint reedgrass, and sedge in the wetter areas, If the range deteriorates, the proportion of these desirable plants decreases and the proportion of less desirable plants such as rush; torbs, and woody shrubs increases. Undesirable weeds and annuals invade and become abundant if the range condi- tion becomes poorer. ' Seeding is generally not advisable because o1 wetness and the high cost of.Iand preparation. Renovating, de- ferred and rotation grazing, cross fencing, and brush control help prevent range dotorioration and promote the growth of desirable plant species. Ttiis soil is sui[ed to lho production oI narrowleaf cot- tonwood. Il Is capable o! producing 7,000 board fool (Doyle rule) of merchantable timber per acre from a tulfy stocked even-aged stand of 40-year-old trees. Harvest- ing wood crops may be restricted during periods of;high water. , Rangeland wildlife, such as deer and cottontail, use areas wl~ero excellent cover is provided by willows, rushes, and other wetland vegetation. Wildlilo on this soil can bust bo aided by proper livestock grazing and by allowing natural vegetation, such as willows and cattails, to develop. Flooding, a seasonal high water table, frost action potential, and low bearing strength are the greatest limi- tations to urban dovolopment of this soil. TI1o soil needs to bo drained and protected from flooding, and designs for roads and buildings Hood to bo modified, to offset these limitations. Septic tank systems will not (unction properly on this soil and may pollt:lo ground water, Tho capability oubclansoa are Illw Irrlpnlod and Vw nonlrrlgnl• ad. '