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<br />WC!;TI!);! .-1-.tID G:OG:-~'\P:iIC FE.ATUF::S
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<br />T~e a.re3- covc:rcd ==:r t!':is ~,tatet':.ent is the crai!,~c;e basin C!~ ..he
<br />Colorado :<:i ':-;:T sbov.~ ":~0 ;E;-:'!,::." Ari z:c;n3.--th<.t is. :1.:,:,c-:e tte ::.o-called
<br />-:x:;r:;:!)act '00int ...hic!:\ seoarat-zs the ":...:~-:'~r" 2.!:d "':"'o","er" basic:; of the
<br />C01~'-::;'dO-::\i Ver. It is - d2fi::ed 'b}' th~ - Color:1J,O Si \"<::!" Ccrr~~.c:' as "a
<br />point in the c;-S.i n st.e::. .:Jf the C010;:,:-..,1o :ii \'er one ~:i Ie b.;olo..... "he !.'louth
<br />of th.:: P~ria Piver."
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<br />The Upper Colorado River Basin (Fi~'. 1) con:pri$E:s about 109.500
<br />sq~ar~ miles: ir. .....estern Colorado (38,670 s~. ci.), sOuth...estern
<br />W:,cr::i:11} (17,430 sc;.. rll.). r,-El!;;tern Uta!, (37,310 sq. :::-.i.). north....estern
<br />,/-.". -'.Xl'OO (^ 5'0 -~ "',) fi^" n"rt'le.--+"'...... .....'...c~." (k 51n ~,' -.; )
<br />.,.." ".e :;I~ L ~~'i.' =.... . "I.. .." . ~''''._.., -"'~_<-''''-o ,..... -'-'-' '~'-l' '_'''' .
<br />The b...sin is -.:iU.ir. par"t5 of two !Jrinci:)3.l ihY:1ic:-:.:_i'lL~ion!l 0:' t~:-::
<br />Ur.i ted St,:.tps--tr-:e Rocl:;.. l'~ount.air: ~y"te:n a.nd t~:e I;1"~I...'r:.:on':~r;e ?l",tecus
<br />(Fez,nene:1 :J.!1d JObr,zon, !:;~(,) .1/ Tb_' 'tasin e;.:"ezldro :':""0:-', l:i.ti'tude ;-.50 311'
<br />r,orth t.c :~30 27' north, [J.~0:lt-550 miles, and frc,~ lc.t.,.it,....d.e 1JSo 3131
<br />vest tc 1120 19' yest, ~~o~t 350 ~lcs.
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<br />.;0rth'lNird fro::.. Lee Ferry, the boundar'v of the ba.sin follows the
<br />cre~~t:j ('If the :?e.riJ., A::'J.-"l.rius. and 'f1sa:,c!1 P1ate:.:ls p.r.d of' the T;,T",setc!1
<br />Ra;1Ee to merl;e fir,,,-ll~' ...ith t:-:e CC:-.ti:".c-!ltal ~i\'ice &t t:!e ::.orther:: end
<br />of tn-= ~-:ir:d RiVer Ran.se. ~-iouth'r:.::-': fir,::' east-...ard frcr. Le~ Fer:-:;, the
<br />bcu:"lc.s::::'y t'!"ends fir::t acrC:S3 t::e ::t.:iUtv Pl:Jtenu. alo:1~-:" ~he J,'::rt. er.d
<br />east rim of .31ac;~ l.lese, tn<.::n acrc~::; the sOlJ.t.~e=-n end of ~'le C:~u~;}<.;...
<br />H:'lmtains to merge ....ith the C0r.ti:,(:-nt3.1 ::iivide Ii fe\; ::;::le.~ n0rtl:'::'l.st of
<br />G311t:p, i!. ~;ex. rrct... here nortL\Tdrd, t~e e'l5t bo'.."!'~d.u.r.'" :J:' t,.e l,asi!1
<br />follo'Ws t.he Cor.tine:.tal ::JiviJe t:.L':l~5t 1,000 ::-.ile::: to t:,~ ;.ortner:: cnd
<br />of the Find ::ll ':~r Ra::ce ill ':Jm~ing.
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<br />T:-:e rc-lcrndo Fiver rises i:1 the ex,,;::"~.;,e e:1.ster~ ""n:-t of' the 'tasin ?
<br />or. the elJ.:-t. slo~e of Vaunt I~i~:"thafen, a 13,'Jf''J-foot ne:1f. 0" tt.e Conti- .
<br />nent.'ll ri-.'ide, anj fl_o',.-s :.;o'.lth"'esh':!.::-d aCro::;s all the u;:Jper o:;$in to
<br />Lee Ferr:.;. G!'een Ri'u:r, t!1e largest tributary, rises in tbe .ind River
<br />Ra....ee 9.t the r..ort.t tip c.1' the basi~ :':1d flow3 E'r::1,;,th~"o.rd to .:.:,-: Jar.ction
<br />with the Colo;:3.1o River aoout oJ n:iles 3o'J.tn of ']re[;n R:ve:-, Ut3!1. :'h~
<br />S~Ul Ju~n River, t~c next largest trlb~t~ry of the Coloru5o ~iver, ri3es
<br />oa the '"estern ;;;l;;ipe ::-f the C:ontio2nt:.l l:li,"'::le in t!IC sout:.east p'irt of
<br />t~e t..az;ir: ar.d ~~l,::n-::; ''''cst to its jUnctic~, ;li~h the Co::'c::-edo River about
<br />75 ::-J.les west of cluff, Ur:,';.
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<br />PrincirJfil tri""butgrie: o~ the Colcr':lco 3iver abov;" t;,e Greer. Piver
<br />are the Eg!.:,l~ River, X'oL.ri:1[ For-!-:, Gu"dsc:1 ?i ....er, Ilr.u. the Dolor::-s
<br />River. T:.,c.:;e 0f the Gre:>tl Ri'ler ~re i~e-'" For,: -'i'.-"r. :Jig ;3'1n1y C:-eek,
<br />Blacks F0rk, iien::rs For;.:. &':1'i l'iJ':;::--a, !..~'lit~. DU~I: ~. :":-2.ce, a,.6 San
<br />Raf3.~l Pi-,'cr;:;. ?rincir:al T,ribu":.nri,,"~o o:~ t:le Sf:.. J1... ~:",-,",r a.r~ t:,e
<br />:-Ia'/sjo, i.cs Pin':)s, :\r.it3.s. e.:-.\1 La [.lata Ri v~r;.. Other ~rii;.utaries that
<br />e:~t::o-r tr.e Co:cr-!Jc Ri ver belo",' t:-,e Green ?i 'Ii:.::- are L-::e Dirt" Devil,
<br />L5cal~r.te, and r~ria Ri~ert.
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<br />!/ Fenneman, :.evi:':;, 1-1., and J.:hn.-;on, :J. W., 191;6, ?hysicC!l divisions
<br />of the United States: U.S. Geol. Sw-vey ;.lise. l'1aps and C!1arr.$.
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