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<br />BOII. 6URVEY
<br />Rrl+rrsrnln(ivr ln•ofiln of Nerlcrlnnd very cobbly sandy
<br />I,mnl, 1 lu I'!. pr rrrnl slopes, lurnled J50 feet. not•Lh of
<br />crater of sec. '_'S, 'L'. 1 ~., R. 70 11'.:
<br />.\1-ll to .1 lurlirs, brawn 17.51'R 5%!) vary cabtdy xu ndy loom,
<br />do rl: In~nwn (7.51'11 3%e) n'hcu uud.vl : madrru lc, Iluc.
<br />gr:uu,lnr s(n,clurc; soft, veep. friable; 50 percent
<br />gra ccl and cobblestones; ncutnl; elm r, smooth
<br />hamuln q'.
<br />Blt--{ N 7 inches, brown (7.STR 5/3) vrrS cobbly hmvy
<br />con rsc sand), Ioaw, dnrl: bn,wu (i.SYlt 3/3) n•hcu
<br />moist; wen 1:, median,, subangular blocky structure
<br />that D:vls [o moderate, Ihlc, gmnulnr; hard, friable;
<br />few lhin clay films on llm Ennis of peds nod ^s cont-
<br />in~s m! ;ravel and cnbUlrntnncs; 50 percent grnvel
<br />and cobbles; neutral; Glen r, smooth bopndnrp.
<br />,B3t--i ro 15 inches, reddish-brown (5YR 'u/3) eery cobbly
<br />sandy cloy loom, dock reddish brown (5YR 3/3)
<br />when moist; weak, medium, prismatic structure
<br />that. pa rls [o mmlerate, medium, subangulnr blocky;
<br />exl rcuu•ly hard, friable; ninny thin cloy nlws nn .
<br />fa LY`S ui pcds, ns coatings on sand and Gravel frog= `"
<br />n;rnts.:md ns bridges bet n•ecn sand Grains; 50 pcr-
<br />ceur grsrcl nod cobblestones; neutral; grndunl, ,vnvy
<br />bound n ry.
<br />Bat-lu h. 9d Caches, reddish-brown (?.5YR 5/9) very cobbly
<br />light s:mdr dnr loom, reddish brown (2.5Y It 9/9)
<br />whcu uwist; wen L-, medluw, sulmngulnr blociq• struc-
<br />ture; extremely hard, very friable; Pew thin clay
<br />lihns nu the vertical Pncc~s o[ pals, as con [fags on
<br />scud grains, and as bridges betnrrn sand grains; GO
<br />percent cobbics[ones and gravel; neutral; grndunl,
<br />wavy bonndnrp.
<br />G-°_0 to GU hlchcs, reddish-brown (2.5YR 5/9) very mbblp
<br />coo rso sandy Innnt, reddish Drown (?.5YR 4/9) when
<br />moist; umssire; extremely hoof, very friable; 80
<br />percent cobbles and gravel; neutrni.
<br />The A horizon rnngea Prom 3 to 8 inches In thickness. Con-
<br />tent o[ rock fragments In the A nod B horizons ranges from
<br />5U [0 711 I;ercrnt. The C horizon ranges from light sandy cloy
<br />loam to sandy loam in texture Content o[ course frugmeuts
<br />In the C horizon Is more than 50 Percent. ,
<br />Nederland very cobbly sandy loam, 1 to 12 percent
<br />slopes INdDI.=I'hie soil is on onttvash Enos and on t}1(,
<br />uploads i^ the cent.rnl part of the Aren. In most places
<br />it occurs us ,wens more than 50 acres iu size. These areas
<br />have nuu1Z• stones ;uu] cobbte'stones on the surface.
<br />Llcluded with this soil in nulpping are scone soils that
<br />loci: a s:uul•q clue Irn:nl subsoil nod that. are vety stony
<br />and robbl~• sandy foam throughout the profile. Also in-
<br />clr,tlyd, nr;lr thr• eastern edge of out\vnsh fans, are some
<br />sm;lll :nras of Vnlinont cobbly clay loam, 1 to 5 percent
<br />_slnprs. 7 6,• inchlded soils nmhe up about 20 percent of
<br />each ntanpa) area.
<br />P,uvo1F is slo)r to medium on this soil- The erosion
<br />hazard is slight.
<br />host of the acreage of this soil is used for range or
<br />pashu•c. \fnn}- ;bens near Bnnlder are used as homesites.
<br />(Cap;;hilily unit VIIs=1, nonirrigated; tree suitability
<br />group G)
<br />~~11VOt ~Cl•ICS r
<br />'I'hr Niwot series is made up of deep, somewhat poorly
<br />draiuc;l soils that, me shallow over''~ravelly sand. These
<br />soils formal on low terraces and bottom )ands in loamy
<br />allnvinm .tiupcriulnoscd over sand noel gravel. Slopes are
<br />6 to 1 pr.rc•cnt. lslcvntions are 4,900 to 5,500 feet. The
<br />anti rc rr~rtatiou is mniuly bromegrass and water-toler-
<br />:ult grasses. Auuual preclpltntion is 12 to 18 inches. illenn
<br />]9
<br />annual air temperature is 48° to 52° h., u~`t~,-(J1C #FOSt-
<br />free Benson is about 140 to 155 days. .ce;.•--..
<br />In n representativo profile the surfircc layer is dark
<br />grayish-bro)cn and grayish-bron•n clay lontn and loam,
<br />about 14 inches thick, that. is Inottlcd in the lo)ccr part,
<br />1'hc underlying material that extends to n depth of CO ,
<br />inches or more is pale-brown gravelly sand that contains
<br />many mottles. In the surface layer, soil reaction is mildly
<br />allrnlme, and below Lhis, it is neutral. ,
<br />Nin'ot soils llavc modmuto permeability. Available
<br />natter capacity for the pt•olile is ]na• to malcrnte. ]loots
<br />can penetrate to n depth of f,0 inches or more, and the
<br />seasonal high \vater table is at a depth of betn•een 0 and
<br />18 filches.
<br />Dlost of this acreage is used for pasture. Some small
<br />areas are used for irrigated crops, and an increasing
<br />munber of nl•cas me used for sau(1 and gravel pits.
<br />Representative profile of Niwot clay loam in nn area of
<br />Niwot soils that has slopes of 0 to 1 percent, located 2,100
<br />feet south and I00 feet \vest of the center of sec. 10, T. 1
<br />N., R. 69 W.:
<br />All-0 to 6 lnches, dark grayish-brown (lOYR 9/'?) cloy
<br />loam, very dark brown (lOYR ?/'1) when cools[;
<br />mwlernle, fine, granular stn,cGrre; soft, very frl-
<br />nble; mildly alkaline: dmr, smooth bounds rc.
<br />A12-8 to 19 iucbes. 6rnyislo-brown (lOYR 5/L) loam n•iflr
<br />cununon, umdinm, distinct, strong-brown (7.SYR 5/0)
<br />mottles, very dark grayish brown (lOYR 3/2) when
<br />moist; weal:, coarse, subnngalnr blocky structure that
<br />parts [o nrodemte, 8ne, granular; sllghtlc Lord, soP[,
<br />very friable; mildly nllcaline; grndunl, wavy bound-
<br />ary.
<br />IIC-14 to tl0 lnches, pale-brown (20YR 6/3) grnrefly sand
<br />a•Ith moor, distinct, large, strong-brown (7AYR 5/8)
<br />mottles, brown (lOYR 5/3) when moist; single
<br />grata; loose dry or moist; ncutral.~
<br />The A horizon ranges from 10 to 20 Inches In thickness
<br />and from loam to sandy clay loam or clop loom In texture.
<br />Depth to underlying send and gravel rouges Erma 30 to 20
<br />11ICIIes.
<br />Niwot soils (0 to 1 percent slopes) 1Nhl--These soils
<br />nra on strennt terraces and bottoms in the eastern part of
<br />the Aren. In most places they occur ns irree dnrly shaped
<br />nrens more than 80 acres in size.
<br />The profile of these soils is much like the one described
<br />ns representative for the series, but the surfncc laver is
<br />variable in texture. This layer ranges from sandy cla}•
<br />]omn to light ciny loam or loam.
<br />Iuclutlc(l with t.hesc soils in mapping arc small, almost.
<br />barren gr;u•el bars and dual] areas of Lovclands soils.:Vso
<br />inclu(lctl aro unnamed soils that. are sandy. These includ-
<br />ed soils and gravel bars mal:a up 15 percent of each
<br />[napped Wren.
<br />Runoff is slon• on these. soils, The erosion hazard is
<br />slight except for back cutting near chnnncls. I;ecnnse of
<br />their positaml in the 1a11119G1pC, these soils are fi•egneutly
<br />flooded. They have n seasonal high o•ntcr hablc.
<br />73ec:nlse of the high n•atcr tablo anti the. depth to sand
<br />ot• gravel, these. soils arc best. suitc(1 for use as pashu•c or
<br />nlcndmc. These soils me also suitable ns u. site for grnrcl
<br />pits. LI Bonin places a feu' small areas nt•e uscrl 1'or il•ri-
<br />gldrd crops. 1'hrsr nra ul•cns that. are mol•c couvcuirnt. ro
<br />farm thou to pl~nnt. to 817155. ((~Rpahlllty units I\"w-1,
<br />irrigated, null VIvv-2• nmlirrigated; tmc suitability
<br />gt•oup 0)
<br />ara:.~,,:..xs.. ..
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