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<br />between 13.500 foot alone; tho foothcUs aced 10,000 to 1",,200 feot n10n,;:',]'0
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<br />Continon-;,.al Divide. The Laramie RanGo vc..rics i~l clevation from about S,GDO
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<br />foot east of Laramie, Wyoming to lO,OCO foet near C8moron Pass~ Colorado.
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<br />The South Platto River heads near t;lO, southwesterl1 corl1or of till basin ill the
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<br />mountains above the comparativoly level Sout!! Park area, v.fhich is surl'ounded
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<br />by mountain ranges w;,ich rise to elavations of 10,000 to 14,000 fOGt. Tho
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<br />Front R9.Ilgc passes to the cast of te,e Sout;1 Park aron. The Ark~ns(ls-South
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<br />Platte River divide. which forms the mos'c southern boundary of' tho basin,
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<br />varies in elevation from about 10.500 foet Qt the Park Ho.ne;G divide to 7.5DO
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<br />feet near Pabnor Lake, Colorado and 5,500 feet near LimoD, Colorado. . T~o
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<br />South Platto-Ropublic9.Il Rivor divido ,,;,ich forms t])O eastern bo\),ndo.ry of the
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<br />basin lias in tho plaino rCigion and varies in olc'Vo.tion from 5,5CO foot at
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<br />Limon. Colorado to about 3,000 foot south of North f1o.tte.., Nebraska, i!lO
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<br />northern boundo.ry of tho South Platte Ri vcr basil, is formod by a soction of
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<br />tho Hi:;h Plains which s lopos oo.stward with elevations of 7,000 foet Y1o,),r ;;ho
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<br />foothills of tho Laramie Range, 5.300 feot noar tho ','~'yoLling-Nobruska ()ouudary,^
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<br />and 2.800 feet near North Platte, Nebras~a.
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<br />3. Str0um..~. Tho main steIn of tho Sou.th Platte Rivor flO1.~rs from tho
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<br />South Park arca throuGh ruggod mountains to "::::1torton, Colorado. Thoro it
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<br />emorgos upon the plains !ll'ld flows north"rly. i",r:,ll."linc; the Jnountaino.
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<br />NOD.r Greoley. Colorado it turns sharply to tho eastvrard D.nd flm'<'s to its
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<br />confluence with tho North Platte River at j-Iorth Platte. N"bras!m. Thu pOX'-
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<br />ennial stroams of tho basin aro those draining tho Front Ranso a;1d b,cluclo
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<br />BOD.r Crook. Clear Creok, St. Vrc.in Creok, Big Thompson River. Cache 10. ?o',\(;ro
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<br />River, Lone Troo Creok !ll'ld Lode;epolo Crook. Tho flmvs of th" tributary
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<br />streams hoading in tho plains rOGion aro intcrmi ttcnt o.nd contributo to tho
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<br />South Plo.tto Rivor flows only durinG periods of hoo.vy rainfall or sl1ov,molt.
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<br />4. Strco.m $lopcs.. The slope of t:'10 South Plo.ttc J.i,for ullora[:cs about
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<br />oight feet per milo in tho plains ragion "it;1 a maximuD of about 15 foot pOl'
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<br />mile direotly downstroam fro", Denvor. It is about 68 feot per r,1i10 in 1'l"tt"
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<br />CC'llyon whore tho stroam flows in a nnrrow e;orge thrOUGh the Front HOl1f'O. '111d
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<br />II-2
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