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<br />in the former province embraoes the CelorJ.do Front und L:.runiu Rungos;
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<br />inoludes the headwaters of the South Platte River and of ~ll of its
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<br />tributJ.rics vmich ent~;r from thu VIGst; ...Jld is &b:)ut 5,560 squr,re ;::tilos in
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<br />arun. This portion consists for tho roD.in pD.rt of high, 8xtonded, precipi-
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<br />tous mount~1n rnnges, pnrti~lly wooded but inoluding some D.r~b1e lQnd.
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<br />The Colorado Piedmont seotion of the Great Plains province is bounded
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<br />on the north b'l an escarpment which divides the Lodgepolo Cr0ek watershed
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<br />from tho remainder of the basin; on the eo.st by the South Pbtte-hopublico.n-
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<br />Arko.nsas divido; on the west by the foothills of the Colorado Front Qnd
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<br />Laramie F.nnges; and extends into the ,Arkansas F.i ver bG.sin on thu south,
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<br />The part of the bnsin which lies in this section is charG.cter"izod by
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<br />broadly terraced plains lunds, p"rtiully 1100ded along thu streccms and
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<br />in the higher portions, and by tho rich South Plutto River v~llGY furm l~nd.
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<br />Tho 'ure~ of this portion of the basin is 11,340 squure miles. The Figh
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<br />Plains section lying t, the north, east, and south of the Piedmont soCti'lll
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<br />includ"s the ren"inder of the bo.sin, approxiD"tely 7 ,140 sque.ru riiles.
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<br />4, Topogro.phy. The westorn bound>:-ry of the be-sin is f'Jrmcd by the
<br />Contincnt~l Divide cend tho .4lrarrj.u nunge. Elovcctions vary along this
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<br />bound.ary from 8.700 feet nu>:-r the Golorldo-Viyomi'ng border to ovor 14,000
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<br />foot,au"d average about 10,000 foot "long tho Continent"l Divide. At th"
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<br />southwestern corner of the basin tho arua knovm as South P[J,rk, a llC[J,rly
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<br />f1ut o.reo. with an elevr.tion of' "bout 10,000 foct, is entirely surrounded
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<br />by mountain runges and bounded by tho Trlrryull .kountains on tho northm,st.
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<br />Drninage fron these high mounto.ins flows through c.nd around tho front
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<br />ranges in deep narrow gorges through the hogback ridges which characterize
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<br />tho western edge of tho Piedmont section (r:.verage elevation o.pproximately
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<br />7,000 feet), and emerges onto tho plains. The watershed throu;;!; the
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<br />Piedmont section is a broccdly rolling pbi.n in which the flood plain varies
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<br />from one to three mi les in width. Tho bench lfillds are from 20 to 200 feot
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<br />above the flood plnin and the lands then rise gently toward the mountains
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<br />1-2
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