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,- i n+rrlc Series The Norte series consists of moderately +vell drained soils 24 to 40 inches deep Deer gravel and cmd. These soils formed in gl.z+•elly alluvium on broad alluvial fans. Slopes are 0 to 1 percent. Elevation is 7,500 to 8,300 feet. Natural +•egetatinn is dominantly blue grama, ]ndiun ricegrass, and low rabbitbrush, The average an- nual precipitation is about 7 inches, the mean annual air temperature is about 91° F, and the frost-free sea- son is 00 to ]00 rlavs. In a representative profile the surface layer and underlying material to a depth of 30 inches are dark gr;irisl] brown gravelly .candy loam. Pclou' this is very +rravelly loamy sand that extends to a depth of GO inches or more. Permeability is moderately rapid, and the a+'ailable +vater capacity is low m• moderate. F,eaction is mod- erately alkaline. The effective rooting depth is 24 to 40 inches. The seasonal high +cater table is at a depth of 36 to GO inches. These soils are used for irrigated crops and for rvlge. Representative profile of Norte gravelly sandy loam, 300 feet east and 2,-',]0 feet north of the southwest corner sec. 18, T. 40 N., F.. 8 E. .4p- 0 to ~t inches light Lrmcni ch gray (10]'R 6/2) gravelly =and}' Inam, dark grayish broom (101-R 9/2) moist; rand+a'ate fine granular structure; soft, yr-ry friaLle; 75 prrrent gravel; ca lea rcous; mod- rvratcly alkaline; ck•ar smooth houndai}'. AC--4 to ]°_ inches; light Lrmynish gray (lOYR G/2) gra+elly sand}' loam, dark grayish brown (70]'R 4 /2) moist; ++eak mrdium subanbntlar blocky struc- ture; slightly hard, very friable; ?0 percent gravel; calcareous; moderately alkaline; gradual +vavy boundary. C1-12 Lo 30 inches light bm,cnish gray (lOYR 0/2) gravelly sandy loam, dark grayish hrou~n (]01'R 4/?) moist; massive; slightly' hard, eery' friaLle; 30 percrnL gra rel; scone discontinuous arrumu- lations of visible Secondary ea rbm,ate as concre- tions and coatings on gravel fragments; calcare- ous; modPrafely alkaline; gradual +cayy Lnundary-. 11C2--30 to 60 inches; very gravelly ]Damp =and; gravel and sand glee a grayish cast on esposu re; 50 to 80 percent grace] and cobhles. The A horizon is gravelly sandy loam or sandy loam. The content of grace] ranges from 5 to °_a percent in the .4 and C horizons and from 15 to 35 percent in the C1 horizmt. Depth to the lIC hnriwn is 29 to 40 inches. This horizon is eery gravelly loamy sand or sand that is 50 to 30 percent gravel and Bobbles. No-\prte oracclly sandy loam. This nearly level soil occupies the low end of broad alluvial fans, mainly in the northeastern part of the Area, Slopes are 0 to 1 percent. The profile of this soil is the one described as representative of the series. The Crater table is com- monly at a depth of 3G to 60 inches and is highest in summer. ]t is manipulated b>• a system of drains and checks..4bout ?5 percent of this unit is included areas of Quamon gravelly sandy loam, 10 percent areas of Dunu] cobbly sandy loam, and 10 percent San Arcacio sandy loam. Runoff is slow. The soil blo+ring hazard is moderate. This soil is used mostly for irrigated crops, chiefly potatoes. Small grain, alfalfa, and vegetables are also gro++-n. Some small areas are used for range. Capability unit IIIs-2 irrigated, VIIs-7 nonirrigated; Dountain Out++•ash range site. Nr-Vortc•f)unul cnn,plrx. This nearly level map- ping unit a copies the upper end of broad ;tllucial fans, mainly in the north-central Dart of the Area. Slul~es :u•e 0 to 7 percent. This unit is about 9(1 percent Norte gravelly sandy loam and 40 percent Dunu] cobbly sandy loam. ]n unleveled areas there are many small s+eales :Ind ridges, The ridges are 1 to 2 feet higher than the s+vales. Norte gravelly sandy loam and Dunul cobbly sandy loam have the profiles describer] as representati~'e of their respective series. About 20 percent of this trait is included areas of Quamon gravelly sandy loam. P.unoK is slow. The soil blowing hazard is ]o+v to moderate. This mapping unit is used for irrigated potatoes, small grain, alfalfa, and ceget.ables and for range. Capalility unit 1Vs-1 irrigated, Vlls-7 nonirrignted; Mountain Outn•ash range site.