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<br />FLOODS OF 19115 IX' THF. l'':'oHTED ST:\TE::::
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<br />~OrT}r PT.ATTE HIYER R-\.S!X. COT.OR!-.DO, J"l"'XE 10,(.';
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<br />nn
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<br />O)'IP,\ nr~()~ BY FHEQrEXCY HEL,\ TIOXS
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<br />'I'll<' i'cLllrl\ lll~l~l1ir\l(il' of iiood:-, lll:ty ht, ('olllpal'l'd hy rllC' ll~l' of
<br />1'lTqll('1WY l'l'l:trin:l";: ho\\'p\-t\l'. tlli::i cOlllpari.":oll i~ limited illlll,).;t ;\l"1."ns
<br />::r(':t~ to tl(,()il..: ]l:\\-iilg ,l l't\i.llITt'IH'P illtl'n':l] of :l() YP:\[":-- fJl. !(':-,..:, no.
<br />I;\i]p<l d:\t:l "('Il'."r!I~Jlg. flood fl'('qw\!)('ip:..: :ll'e ill :\llotlwr ..:('('rinl\ of th~:-,
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<br />Tbt, hl':\y:-, n.uofr HO\Ylng- (lo\\'n stl't'P gl'at1il'llt~ ill tht, C:i~(l(' n(l\.I~
<br />:\n'~t lif Ea:-,t :lllti ""c;.;t Plum ('rpek;.; ~c()urccl the soil dO\Yl1 tn bL'IJruck
<br />ill pl:tl'P:--; along the ~m<llI trihutary chaHlIe13, "~h(>r(' chanl:d:-:i wen'
<br />1l\:\\\l>q,,:\t0, flw wah'r flowed oycrlantl1 ent nc"y (.l-;.anncl:::. and ,h'positcll
<br />:-';\lld, gL\ Yl'I, t'llorlllOllS bOll ldpr::;~ and ot her del'ri:: Oil fiplds :\!ld p;l:":fUl'e.o.:.
<br />(!ig..;,:j :tnd -t).
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<br />report .
<br />~tr('alJ]fl',;\i" 1"\" ()j'(l~ I)jl 11::111.\' ..:tl'l':tlll": ill tlH' tloo,J ;\1"\':1 \';',\\\'r dll \:I,t
<br />'~!lt(,d:\[(' l~!.!il (d. li:li.(' l,\'('l~ u!Jt:tilll.'d f(11' ollly :\ fl"" .\"\.':11':-'. Fi!"l~l 1rl'-
<br />:;lil'11(.'" J"t'ht:liJi:-- fo;' 1:lill:--1J:1l dond_" ('allll(Jt Ill' dp\.l'l\J]ll'd fr1illl ,..:Lllrt-
<br />J\'.n:-: 1.p,'I\rd-:. Fill" \'\;:::T]v. ih' i!nl)(l of .TlHl(' t;i(;,-l (ill Ph_Hil ('rl.:',"'k
<br />\\-,1;-; :.!tl tlllW-; lht' pn:\'io\j:-; nlaXllllnnJ di~{'h~lrgt~ III ~n ."I.':_trs of 1'1,'('orcL
<br />It:-, truE..' rh'lllT('jH't: illkn-al is (.('rtaillJy Jllndl greater d}al1 :2+ years,
<br />hilt hoi\' lllU.dl ~!,(\:Lti'l. ;.; ,Int kno\';n. Th~_ trend 01 ;\. ,-_nn-~ through the
<br />-:!,!!inl\ lbt:t )ll(h';lt( tl);\t the n()()il of .Tune If), }i)():i, on FIHm Creek
<br />~I;;lll ;t l'CClltT('Il('(' llltPiT:\] \\"(']] ill excess of Ion YC,ll'S.
<br />E\,(,lt at :.:ratinn" ",'jt), (,oiiqnt"af t\'ety lm~g n'('ord~, the l~-l(;.-) Ho!)d:--
<br />_~;l'1...:\tJ,',: l'xn-,\'t!,.d fh.l~ lliT.\':nH:" ll],lXimlllHS :It ~()me luclltlolJ:-:,
<br />Tilt' l~){;,-, iH':\1,; d:S,']L:.rg"l' ;}f tlu: South PLtl h-, Hin'r at Dt'l)\'('l' \\',b
<br />i :~;) ~wn'Cllt of t lh' p1y\'i\l\\~ lllaxi\\\nm during ()I Yf'l1rs of record, llis-
<br />11)rir:t1 in,ff)l'Jiutioli indiealb rlwt r]le 1:)t);) pe:1K discharge at 1)cll',e1'
<br />'i\-,1:3 tllt' grp:lr{'~r :-;in('(~ at least. If-i.!4~ a period of 1:21 years, E'i'cn ilsing:
<br />rhe l:2:2<real' plotting: position, the 1965 peak discharge plots ,yell
<br />:\tHl\'C tll(' ti'PJHl tif the fn-'!p!f'!!('Y CUl";C through thIS station (ltlta,
<br />The flOOtls on Plum Creek, the South Platte Ri\'er at Delln~r~ :llld
<br />:It :':OIlH', lO(';ltion~ on Cheny. 1\:10\\,,-:', and Bijou Creeks had n'CllI'l'elW{'
<br />illlen.<.ds ill exn.'~)-i of 100 yeal's, but. the Hoods did Hot haYl~ suell high
<br />recurrel1ce internds OIl all streams or at. all points on the :4r(>alll~
<br />] [sted abon~.
<br />Floods with I'l'CUrI'l'llCe intl'ITals in excess of 100 years are certainly
<br />rare (>\'('lIt:-:, and at !lInn)" l()(':ltion~ tbc floods of .Tune 1!)();1 \\'(>re in this
<br />catl'.!!Ol'Y. {'n fort nnatply, with nUl" prp~l'lJt kllowled:re~ Wl' ('tlllllot dl'Il'I'-
<br />milJe tlIt' true fn\(llll'IH'Y of :-'lwh f1ood~, hut tllt're is the remote ('halH'l'
<br />that Hood....: of ~Tl';lter 1I1ap:llitlHh_':-, Illight happl'll \\'ithin a few years,
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<br />CO:\IP.\IlISOX BY CHAXXEL COXDITIOXS
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<br />TllP ('xt(>Jlsin' and brge-scale ('halllres e<1us('d lJv the fl()()d~ of .TUllC
<br />,- ~ .
<br />l~f.;) ill many stream ChallllPls and to tIle ,nlt(>l'~h(>ds are additional
<br />('yidence th:lt the floods Wl're ()nt:-;t:lndill~ t'sents.
<br />On-.Tulle 14~ the flood on Lone Tree Creek north of XUIlIl seoul'ed a
<br />b,r,ge hole in eoarse gra\-pl :md ('obbles tInder the bridge on C.S. High-
<br />\\'ay 8;). Deposition of SOllle of the nluteriul downstre~\1n from the bridge
<br />callspd :1 t:h,mge in the cbum.c11ocation and Cllttiilg uf llW right bank.
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<br />F.W-cRE 3,-Erosion scars amI dPtlOsitioll south of Ca:;;tle Rock, Colo" June 17,
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<br />1005, De!lye!" Post vhotocraph by Lowell Gi::orgiJ.,
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