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• $i{(i ~1 • RIO CRA ND6 COUNTY ARR.\, COLOIiA DO moist; massi cr; sligbUy hard, friable; calm senor; very stnnlgly :dkalinc. Thr A hni'iznn is 4 l0 8 inches thick. In cu{tivatrd arras the A'? horizon has brrn misrd into thr platy lays. r. Thr ^Ct hm'izm+s is 7 to IG inches thick. I•;xch:urgr•a hlc sodium iu the R horizon and iu the upper pn rt of Uu• C horizon ranges (rum IS In a0 pnrcnt. Ueplh to the sands' C bm~izun is generally 30 Ur All inchrs. 111x-Aluacn In:unv sand. 'this ncu'I\• Iccel soil oc- cupies old Ilrnrd pL•Iins and the Initm' end of brood alluvial fans in the c:lsl-central :uul northeastern p;u'ts oC the Area. Slopes are 0 to 1 percent. The stater table is at a depth of 4R to Ii0 inches. About 10 percent of this trait is included :u'eas of San Luis sandy loam, Norte gravelly sandy loam, and Gunb:u'rel loran}• sand. Some areas are about 5 percent areas oC T[noper loanq• laud. Spots o[ 7.inzm• and San Arcac•io soils occur in places. PvtmoR is slot,'. The soil blots ing hazard is high. This soil is used for irri,~alerl potatoes, small grain, alfalfa, and vegetables and for rlmge. Capability unit Ills-2 irrigated, Vlle-1 nonirrigated; Salt slats range site. Norte Seric The Norte series consists of nxxleralely well dr:Iined ' soils 24 to 40 inches deep Deer gravel and sand. These soils formed in gravelly alluvium un broad allot sal tans. Slopes are 0 to 1 percent. Elevation is 7,Ci1111 to 8,800 feet. Natural vegetation is dominantly blue grama, Indian ricegrass, and Ion' rabbitbrush. The average an- ,ual precipitation is about 7 inches, the mean annual Ir temperature is about 91° F, and the frost-free sea- . on is 90 to 100 days. Ina representative profile the surface taper :uul underlying material to a depth of 80 inches are dark grayish brotcn gravelly sank loom. Itelou' this is very gravelly loam}' sand that extends to a depth of tiff inches or more. Permeability is moderalelc rapid, and the available hater capacity is lob nr nuldm'ale. I;eaction is mod- erately alkaline. The effective rooting depth is `L4 to 411 inches. The seasonal high itatm• table is at a depth of 3G to GO inches. These soils are used for irrigated crops and Cm' range. Representative profile of Norte gravelly sand>• loam, 300 feet east :mil 2,840 feel north of the soutlnvest corner sec. 18, T. 4(1 N., R. 3 1?. Ap-0 to A inches light hrcrrenis-h gray (IOYR f/2) graven}' sand}' In;nn, dark gra7ish broo~n 11(Il'R 4/?) moist; nnnl~a'nir liar grulm l:n' .U uc Un r; soft. vcrr frig blr.: IS pcrrcnt gravel; r:dra rcuu.; nnul- rr;rtrly alhalinr; rlrnr smooth boundary. AC-A Lo 1" inchrs; light brmcnish gray (111 }'R f/?) gravellc sandy In;un, dark grayish In~o+vn (In1'R •t/2) moist; weak nu•diwn suhangular blocky strua tore; slightly hard, very frinhle; 2U percrnt gl :nrl; calenreous; moderately alkaline; gradual n'acy boundary. CI-12 to 30 inchrs light Lvov nish gray (1nYR f/2) gravelly s:uuly loam, dark grayish brown (lol'R 4/'L) moist; nmssiru; sligblly h:u'd, eery frig Llr; '30 percrnt gra vrl; runic disrnntinunus aecunni lotions of nisi blr srcnnda n• carbnnatc as rnnrrr- lions and coatings nn gravel fragmmits; ralcarc- !!.~~ our; modrr:: trly alkaline; gradual wavy boundan•. ~~~ IIC2-:Ill In Gn inchrs: eery grnvelly loamy sand; gr;+c~•I and s:uul gi cr. a gra}ish cast on es porn rc; 3n 1.. SO percent gra orl and cnlrhles. Thr A horizon is Rrn trlly samh' In:un ur s:uid+ In;un. 'I'br rmrirnl of gravel ra ngrs Irnm i Li ?:, p„rrrnl in lhr A and C horizons and Irnm IS l0 35 pcrrrnt in Thr CI L~riuni. Ih~plh Ui Lbn TIC harinnl is ?d to 4n inches. 'I'lii~ horizon is eery gra crlly In:unt' sand nr sand th:d is Gn Iii An percrnt gr:n'nl :uul enb blrs. Nu-Narlr gravclk s:uuly Inam. 'I'bis ucnrlr Ictcl soil occupies Lhe Inh end ud broad alluvial C:uu, mainly in the uurthrtstern earl of the Area. Slopes are 11 lu I prrcmlt. The profile of this soil is the uue described as representative of the series.'('hc watm' fable is cont- mnnly at a depth of 31i to Ii0 inches and is hi},rhesl in summer. It is manipulated by a system n( drains and checks. About 25 percent of this unit is included areas uC (?uamon gl.ltelly smuly loam, 10 percent areas of Dunul cobbly sandy loam. ;Ind l0 percent San Arcacia sanrlt' looun. Runoff is slut['. The soil blotting ha•rard is moderate. This soil is used !110511\' f01' II'1'Igated crops. chiellt potatoes. Small grain, alfalL•I, and vegetables ;u'e also grmcn. Some small :n'e'ts are used for I.vlge. Capabilit>~ unit Ills-2 irrigated, Vlls-7 nonirrigated; T\lountain Outn'ash range site. Nr-IVnrlc•Dunul complex. This nearly' letel map- pin;,r unit occupies the upper end o! broad allucinl faun, mainly in the north-central part of the Area. Slopes ou'e 0 to 1 percent. This unit is about 411 percent Nnrle gravelly ranch' loam and 40 percent llunul c•ubbh• sand' loam. In unleveled areas there are many small sh;lles and ridges. The ridges are l to 2 (set higher than the shales. Nm'te gr;IVellc sand' Inam •uul Ihnwl cobble sandy Inam h;rve the profiles described as representative of their respec•tiye series. About 2(1 percent of ibis unit is included areas of Quamnn gl.lvell}• sandy Inam. RunnlC is slow. The soil blowing hazard is lair Lo moderate. This mapping unit is used for irrigated pntntocs. unall grain. aIL•df:l, and vegetables and for I.vl};e. Capability unit 1\'s-1 irrigated, Vlls-7 nonirrigated: DTuuntain Ouhcash range site. I'Ialoru Scrirs The Platm'n sm'ies COllslsts of n'ell rb'ained soils °_0 Gt 40 inches deep oter gravel and sand. 'T'hese soils fm'med in alluvium over grnvelly alluvium un allut'ial Cans :uul terraces. Slopes are 11 to 3 percent. T:Iet'atiun is 7,1;00 to 8,8U0 feet. Natural vegetation is dumiumltFc blue grama, Indian ricegrnss, ring mlthlp, and iceslern n'be:dgrass. The average annual precipitation is about ;i inches, the me;ul annual air tenyterature is about 41° ~, and the trust-free season is 00 to 10~i days. In a representative profile the surface layer :uui up- per :3 inches of the subsoil :ue dark gr;Iyish brotcn loam. The loiter 11 inches of the subsoil is dark brutt'n light clay In;un. 'T'he substratum is about K inches of dark brotcn vel.y grnvelly loam over trl;e gravelly sand that extends to a dcpUl nl' 1;11 inches or nuu'c. 'T'hese soils ;u'e used fm' irrigated crops and fur range.