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<br />SP':&fl <br /> <br />". <br />); !--..-..-..-..-..-.. <br />, <br /><- <br />01 <br /><: <br />C' <br />Z' <br />I <br /> <br />'" <br /> <br />-.._.._n_.._.. <br /> <br />;< <br /> <br /> <br />ARIZONA <br /> <br />I <br />I <br />I <br /> <br />'" <br />, <br />~ <br /><; <br /> <br />.- <br />.- <br />.-, <br />" <br /> <br />,.-- <br />~. . <br />~.~ .., <br />~ ~_..~~ , <br />--,~ . <br /> <br />-, <br />, <br />, <br />(I' <br />L.MMNd ,p' <br />.' <br />I ~,' <br />.~~. <br /> <br />P'OtlH'<"t .'# <br />C.nyon .{ <br />IlM.hUt1t <br />, <br />. <br />_.~. " <br />,. '. ~ <br />. " <br />-, " <br />,....Ui.: to' <br />11: ~ <br />\ ' <br />Oi.mo",t, <br />("I'd ,;..: <br />i"~-~' <br />~ <br /> <br /> <br />:,-~ <br />~ . <br />C , <br />..- <br />-. <br />.:J' . <br />.~..... <br />,'< <br />, <br />. <br />, <br />. <br />. <br /> <br />-. <br />..~ --"'t,.. <br />.... ..~-, <br />PHch Sr>"ng~ I <br /> <br />Figure 1. The Colorado Alller.n Grand Canyon. Anzona <br /> <br />runn...'r' ....hn had 1."lxTil'rk"cd the ulIfl'!!ulal\.'d rin'f. In <br />"'(1 doin~. \\\,.' n:alill'd till..' d.,,:u...,ion... \\tluld Ix'ar <br />,::rl':LIl.'r Irull If lhl'~ \\'.:r...' held in Ihe l'll11r-.l' (11 a (jranJ <br />Can~ 011 (rip. <br />Thl? Old Tilllt:r', Tnp. from S...'rk-mlx-r s.~o. <br />I (}I)~. \\;1" dl'..,i!!ncd III ::ain Ill'\\ Ill...ighl' into Grand <br />Can~lln hi'hlr;. and em lTIlIlllh.'nt;t] I.:hangr: alon~ th..." <br />Colllrad,l Rih"r. \\'1,." ,ought hI fl."l.:mu thl" Jjr...',:1 <br />,l~ht'nali,ll" Ilf Iht' panKI!,anl" III prt'.dam ri\\.'r [riP" <br />and 10 in\.'orporatt' [h\.'lr Jllurnal" <lnJ phlllo,;:r;lph" in (lur <br />n,'''~arch, \\'i.' alll'lIlph:J In (\.',,1 our ld\.',l" ahouI tht' <br />m.:J!,'!nitudt' tll dl.mgt' \\ Hh tht' pt"llpk' \\hll t'\IX'r1t'IKt'J <br />the- ch.lIlgt'""" Ihl."~ 1k,,'t'UlT\.'J, Our inli.'nt hnt' I" III <br />rd;llt' Iht' t'han!!e" oh"nh'd h~ Iht' Old TlIlll'r", <br />t'tlI11hillt'J \\ Ilh Illht'r ;Ul\.yJo[alllllllrlll.tlltm III Ji,lfit'" <br />and lllht'r \\ rillell ;l\.'..:punh, ;LIld 10 hridl~ JI"~'U"" an~ <br />IIldl'[lCndi.'nt It'riliclIilm III t'hangt'" ;lIId Ih\.'lr <br />Important't" hI "t'Ii.'IIIi1k "-1111\\ It'd,;:I.' a/'l..lul (iranJ <br />\an~on. <br /> <br />UTAH <br /> <br /> <br />/ <br /> <br />l....-\F..,'Y <br /> <br />\ <br />""' <br />c.",,!o" <br />0.. <br /> <br />c <br /> <br />.. <br />,t. ~ <br />".' .,. <br />. ',-" . <br />II NO"It.~,,!J <br />"i C."y.... "" <br />" ~Oulll <br />1.,': c.~~:n\ <br />hPUI' :; <br />C,~~I \: 111 <br />;-"i~--~~~ ~ ~ <br />.....__.. 0: <br /> <br />, <br />. <br /> <br />. <br />'. <br /> <br />" <br /> <br />8.i9hlA"9.-1 <br /> <br />"~"'I ~ <br />p <br />'~ <br />l.~._ <br />(."yon <br /> <br />'-. <br />, <br />, <br />. <br />.....'kowu,P.: <br />. ,~. . <br />" ~ <br />, <br />, <br />.. <br />, <br /> <br />- <br /> <br />- <br />. <br />< <br /> <br />, <br />. <br />'1 \_. <br />~'~':-'.~ . <br /> <br />r <br />Q/n,._ <br />.,'"' <br />" <br /> <br />15....1.. <br />('....I <br /> <br />, <br /> <br />Ph.>nlom <br />"'~" <br /> <br />N <br />A <br /> <br />20 miles <br /> <br />PURPOSE AND SCOPE <br /> <br />Tilt' pUrpll"i.' of Ihi" re-pI)rt i" hI pnl\lde alli.'t'dll(al <br />IJlhlrll1alitln on h,"ltlrkal dKII1!,'!t.'" in the- Colorado <br />Hilt'r l'\lrridof Ihrough (iranJ r:1Il~lln, Thl" <br />lllhlrmalinn \\ a" ohtailll'd !WIIl inlt'I"\il'\\ ~ \\ llh pt'nplt. <br />\\hlll'\pt'rkll..:t'J (hI' Clllllradll Ri\i.'r hd"llrl' Ihl' <br />t'tllhlru..:lmllllf Gh:n Canyon Dam, diant'" ;lI1J olhi.'r <br />at'I'tIUI1(" tll hi"[llrical \lllllradll Ri\l'r t'\pedllltln". and <br />"Clt'nlllk p!l"t'r\;l1llHh and Jat;l t'ollt'!."It'd hcforl'lht' <br />;llht'nl \111.'11\ Il'tllllllt'ntal "lUdl\.''' ~'ltI\\ (lIen Camilli <br />Dalll WI' illll'Trrt'llhi" allt"t'JlIlalllllllrlllOltillll ;m:1 <br />di"~'u",, Ib \allll' III thl' ll1;lI1;I!,'!I'IllI'1ll nlllll' ('nhlr;ldll <br />RI\t'r III (ir;lIld Call\llll. <br /> <br />Units and Nomenclature <br /> <br />\Vl' u"t' En!,'!h"h umb 10 Jt'''\.'n~' dl~I;lIk't.''' ;lllln~ <br />Ihl' Ct1loradtl R1\l'T in Gralld Can~\lll tJ.'"ignatt'J <I" ~ <br />I.i.'l'.~ h'lT~ III [ht' (.r;.tnJ W;\"h Clllh,lllik" (l,~'hi: "l'l.' <br /> <br />2 OBSERVATIONS OF ENVIRONMENTAL CHANGE IN GRANO CANYON <br />