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<br />C(}lo~ado State P.i~h"ay Dcpartrr.ent
<br />The CL:y of W,sy, Colo~~do
<br />Th~ Cou~ty of Y'Jma, Colorado
<br />Soil Conser'lati"" Ser'lice
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<br />AeriaL pho,<.>graphy and contour mapping "cre pr~'1ided by the C.S. Army E~gin~er
<br />District, Ka.nsaa CHy, and prcpared by Ku<cera and As..,ciates, ~entor, Ohio. Actual
<br />photography tooK pluc~ on April la, 1~76.
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<br />actu.111y contribute to the sudace runoff. Th" ba~in is go:n~",'hat inc-glltar in shape
<br />~ith the major axis oriented in a ~outhwest-northeast dire~tion. A tributary ~tre~m,
<br />Chi~f Creek, joina the :Jorth F<lrk Republican River about One mne 'Jpstream of Wray.
<br />ChLef Cre~1t waa not studied and only the back..ater effect froTIO ,he North Pork Repub_
<br />lic...""! River was shown on the Ill~". A sTIlOlll lake, Stalker Lake, h located .abol1t two
<br />rnlles upstres:nof;,.ray on Chief Cree", and is lIISintained as 11 fishpreser ve by the
<br />c<>lorado Fish and Carne Commission. The lake has little influence in the control cf
<br />f1oodfl.ows due to its small si~e Imd uncontrolled spillway.
<br />
<br />Rel~ted F10cd Studies
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<br />y~ar w~ter surface profile
<br />..'ray "a~ approxill>ately 2.5
<br />used in th~ pres~nt study.
<br />flood plain co~ditio~a and
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<br />for the NOrth Fork Republ~~a" River through the city uf
<br />feet higher cha~ the IOO-year ~aCer surface profile
<br />The earli~r ,,;ater s'Jrface profile 'm~ based on 1968
<br />10-foot contour "",?ping. The present wat<,r g\Jrf~c~
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<br />The basin is predominately agric",ltural withrncst of th"-arcadevot", dto
<br />grazing or raising ~rops thro'Jgh irrigation. Few artifi~ial ponds have b<'-eJ\ built
<br />in this area since most of the "ater is Obtained by either pumpin~ from w~ll" or by
<br />t3kL~~ ~attr froll> s"-v"-r~l irrigation can~ls "hich run ?~rallel to the river at
<br />differ"-nt loc~tions along the river's length. This ar~a of Colorado has a se~i_
<br />"rid ~li"'ate ,dth hot sUrolers and long, cold "inters. Summer pre~ipitation in the
<br />form of intense, .hort-duration thunderstorms a~<;ou"ts for the !:1ajot"ity of the total
<br />annual precipitation. The.se incen~e., lo~ali2ed ..torm~ are the mosc frequ~.nt type
<br />of ,;-Corm oc~urTing in chis region. Nor",al annual precipitation over the study
<br />basin is about 18.5 inch~_s per year. Tel>peratureo range fro!:! a high of (Net 100'
<br />(P) to <I low of below zero. "c'~llet"tion consiscs of wldely scattered stands of
<br />trees mtd plains grasses.
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<br />^ Plood Plain Information Report for the Korch Fork Republi~an River at ~ray,
<br />Color~do, \,aa pnpar~d by the Corps of Engine"-rs in 1969. :n tha~ report, the :00_
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<br />profile r~fle~t" axistins condicion~, 2-foot Cantnur mapping, and will supersede
<br />the profile in the prevwtl~ Gorp~ .of Engineers' r~port. At :-latn Street, the pre6~nt
<br />.t~dle~ have 100- n~d SOO_year discharges of 3,830 ci. ~nd 7,600 ~fs, respectively.
<br />The old study U""S 4,200 "is and 11,700 "fs a~ the lOO_year and St~nd"rd ProJ~ct
<br />,!oed d ischa.rge~ <it .'ray. Th~ Standard Proj ecc Flood and .'>OO_year f1oo~ are. not
<br />ne~e~a~rily the sa~e zlocds.
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<br />HUlJYARFADESCRlPTION
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<br />Ta.~le 1 be-lo" ~,ontains the drainage anns lor 5ev~l",,1 "",all Stre!illl~ "hich ,!rain
<br />""Co the 1"r~h Fork Re~ubllcan River.
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<br />Dr<lina~" 5"sll\ Ch"'''accericc tea
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<br />Table 1
<br />DrainaReAraas
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<br />The GolorAdo I'Ort 1.0" of the North Fork Re~ubl1ca" Rtv~.r b~sin 1~ l."c~_t<'d in
<br />Yu,"" 1.:Ounty, appr<,>x1."",1t'ety Ll, miLe.s east ~f Denver. Its he.:"l"'~ter.' origIn"", ",-jtllin
<br />"{u,".a County about 15 miles ~outh"'est of ',,'ray, Col~rado. The dver Chen Hm,s in a"
<br />"asterl;- direction dratning into the ,\.rik.lr€€ River, .~bo\lt 25 miles do.",gtrenm of
<br />'.ray. C<lloradu.
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<br />Lcca~ion
<br />~orth Pork Republican River at Wray . . . . .
<br />l<ort~ ,"ork Republican Rive" at che Coloraco_.
<br />~ebraaka Stat~ line
<br />CniefCreek. .
<br />Wcs:Gulch.. .
<br />;.i<<LLL Dry Gul~h.
<br />J"h,,"on' ~ Culch
<br />f:a5t Dry r."l~r,.
<br />~a)'es Cu_"k. .
<br />iJoly Jae Cra~k.
<br />Bloom Cre~k
<br />Rush Creek. ..
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<br />1Ir"" (sq. mi.!
<br /> 54.0
<br /> 85.6
<br /> 13.4
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<br /> 1.1
<br /> ".3
<br /> v.(,
<br /> 2.1
<br /> L6
<br /> 1.0
<br /> 2.0
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<br />T!\e h,,~Jl" is ("{l"'?Ti~~_d Large!.:, ,.f 'an~hJ.l~s ':dvinf: dll ill-ddbed crai:w.ge
<br />p"ttern dn.d .ittIe ..~rf""" cunof[. Alcn"u~h ~he t"'tal draina",", au'"", at t"~ Cnl"rado_
<br />Nebra.ka SCaLe Li~e is ~ppr"xiru~,elv i,25j "quare miles, only 85 s~u~r" ~lle~
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