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<br />~~e occupied by ~hcles~le-ret~il businesse", "~v~r~l in~u"trial
<br />establishments, various w~rehouses, and re"ide~tial development
<br />including sd1oob, c"'"rches, parks, and ~porh facilities. In
<br />addition to the streoh and highw"y" usually fourld in ~n urb~n
<br />~rno, two railrond linBo cro~c Or porellel the ~atercou~3e. These
<br />tran5port~tion facilities include both rail~cad and vehicular
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<br />the St~nd,,"(j Project floud er>d ~.4 fm,t dlJrlng the Intermediate
<br />RagionalFlood.
<br />The S~n Luis C~ntr~l Railroad brioge i5 d 208~foot
<br />13_spsn ~imcer structure. ~e~d 1000e5 ~t the oriage ~~Lo b~ ~.b
<br />fBet and 2 r~"t, re~p~ctivRly, fo~ the StHnda~d ProjeGt Flno,j anrJ
<br />Intd",ediHt" R>J",i.u,,~l Fl...wJ wi.lll "U """"U~d'''B"l un u"tJ"rcl~"r"n~<l
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<br />bridg~ $t~uctUtgs.
<br />In ths wcstg~n portion of thQ .tudy .ea~h. development
<br />is Bc~tter"d ~nd th" la"d i~ wBed prim~rily fnr agticwltu.s. The
<br />Denver and Rio Gran~e Wo~t"~n Rail~nad.which i~ p~rallel to the
<br />Rio G~erlde through the study ~eech ~nd Bppro~imately I mile B~uth
<br />of the ~hannel, a~ts ao a pa.tial ba~.ie~ t~ (jeline~te the south_
<br />e.n limits of the flood pl~ln.
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<br />~f th~ bridg".
<br />Th" Gunbanol Ro~d bridge on U.S. Highway 285 Is alSO.
<br />foot "ingle~span structure, <:lnd the Stoebst L~ne bddg>J 1" a 180_
<br />foot 2-~p~n st~ucture. The Five~i18 Road (Old Del No~ts Highway)
<br />b~idgs con~ists of t~o 9tructu~eB. Th" south gt~uctu~s is a 50_
<br />foot singlB_gp~n steel beam b~idge, while the nn~th ~pan Gonaiots
<br />of a 140_foot concrsts ~rch. Thess lest three dsscrib~d b.idges
<br />would Clot be enc~oachod on and thoy wowld Cause only neglig.bls
<br />head lns~oa du~ing eithe. the St~nda~d P~oject Flood o~ the Inte~_
<br />mediate P~OjEct FlOOd,
<br />The ~apacity of tho Rio C,ondp's m~in chsnn~l ha~ been
<br />eotimetsd to b" S,300 cubic feet per 3Bcond, Duo to thie limited
<br />ch"nnel ~opocity, the b~idgo~ would be abovo ~Il~ ~~o~t elevations
<br />of thp 5t.,mlot'd Pt'ojoct end tho Inte~mediatB Regionol nood~,
<br />Th~ t'oaclIMoy "",tl~flkm",nts afld tl~ldq" "l'pCOacl1n5 ~o"ld be inun(jot",(!
<br />by flo"cI~~l.",~ In ~'X"Ba~ of the channel ~oPaclty lllhi~h lllauld flow
<br />av,,~ lhe adJacant v8ry flot flood plain.
<br />N""" tho> nurtll~.o~t curne, of the city, SOme flood flow"
<br />whiCh become pe~ched bOhind ~ailrood and highw~y embonkmento WOuld
<br />rlUlll pa~allel to the ~i vox bwt at a highe~ slevation tho" thp ; LO~B
<br />in tho flood plain odjo""t1t In tho river. E~st of thr city, these
<br />p""d,~d Flows ~eturn to the low~. floor! phin t~..oLJgh nxistinq
<br />cLJlveds end d~a1Mq~lll~y opMinqa.
<br />Tobl" 2 li~t" p~~tir~nt ~hvatlons For th~ Lt.iJ<<u",
<br />and r"lates their uode~dp ,r"n~" ~l~\I~t\nn t.n th~ cr~9t of t,,~
<br />Tnt,,~~o.di~t.~ ~:siC'n~l floG~. D~rin." ~ flo~~. th~ de~~h cf ~.:O~
<br />ot t:~idgB~ ~ol)id be nff"r:t"d by thH d~'lttl~ or 5tr'Jetur_,1 ob~tr,~~_
<br />Uon ;,nd cloqgIMy 'If '"at~tw"y upB"1"95 th"t OGCu"S. rut aludy
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<br />BridQ~s Acros~ the St~e~m
<br />Thera a~~ fnur vehicula~ bridgB~ and OnC' roii~o8d
<br />b~idge acrose the main ch~nnel of the Rio Grdnde in the 11,92
<br />",ite ~tudy reBch. Photogt'aph~ of th~o~ bridse~ oppe"'~ in figu~es
<br />I 0"<1 1. iII\I"'n~o"~ nthnr hri~'J"~ ~,,~ r1r."in~~.. [Jt~"ctlJr88 are
<br />lncatdd nn tha tran"port~tlon arte~les tn c~o~s d~ain3, old ,ive,
<br />"'e~,-,d~r~ ~nd sloughs.
<br />Tho Hom~lBke Rond bridge ~t ~ils 72.14 i~ at the low_
<br />o~ erld of the study ~~ach. The Sarl Lui. Ceotral Railro~d bridge
<br />is locatad at ~Iile 73,17 Just aa~t of the ci ty limit,., lllhile the
<br />C,"'b<:ltrlll Road vehicular b~ldgB on U.S. liigh.."y 785 i6 at Mil~
<br />76.71 di~edly no~th of Monte VistB. West of the city, the
<br />Stoeber Lena b~idge i~ at Mile 31.00. The uppar limit of the
<br />stCldy uea h adjacant to tha Flv","il.. Rood (Old Del iIIode High_
<br />way) b~idge ~t mila 83.83.
<br />The Homeloke Aood bridge is a 146-foot 3-~p~n ct~uc~
<br />tu.~. The Stand~rd P~ojoct Flood wOClld lack 0,5 foet of over_
<br />toppi[\~ th~ to~d..~\" ~hil.. th... Int..,",,,Ji~t.. Ru~iundl Flo",", wCluld
<br />l~ck 0.8 foot. He~d losses at the b~ljge lllnuld bo 3.3 faet during
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