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<br />p-urpo~es herein, it has been a-"sumed that limited dogging c~n be
<br />Axpected and all bridge structures wo~ld 9t~nd intact. Signifi-
<br />cant change~ if> this pr_i"", i"'P?"ed tly d1ff~rri"; co"diticns of
<br />afutLJreflood,.couldalterth""-;,-t'irn,,tadfloodci'esteanclre_
<br />lnted flood Ullits Bho~'n.
<br />
<br />
<br />"'l
<br />
<br />Ohstr'>ctionetoflclOdflc,"
<br />The effect cf obstructions du~ to bridges and their
<br />appro,,-ch fills h~u lJocn de"'~rib"cl in previous par~grephs. The
<br />nurnoro,,,,oldmeandersofth8"riv..rin_'ita.floodpl,,>inclonot
<br />obstrud floodflowB. Ho..-"ver, ne'" -<..v"lop",e'nt, lcndfills, sod
<br />reis..d ro"dw,.y e[l\b"nkments ,1" or near the ~h3nhoL ,,~~"d obotruct
<br />floodflo,"o and Cau~e increased depths.
<br />
<br />
<br />flood R~c"td"
<br />~trenrn ~t~gP ~-j di.charge records for th~ Rio GrandR
<br />at D"l Norte "nd Al",",oe~, as Ilwll "-8 at r~Of1ts 'liot~, ere pertl_
<br />mmt to the sb;dy of tha loc'll flOG" eituation. Sincel'hy 1,
<br />192G. the Monti! Vista qaoe h,,~ b~~n ~t 0" ne"r thH G"n[}~crRl Ro~d
<br />(U.S. Hlghw~y 2~~! br;~c~, ? mile. no.th of the city. Th1. 9ag~
<br />h"", been the water-sto~e r~cord..~ t,t~~ ~inco ",iy .;lLI. < .~^
<br />r~cords f"r l"t~tions nB~r Uol Norte tw~1n In July 1889, ~nd flo",.
<br />in the Al~~aso ~raa have been r~cardad ,inco m~y 1912. R~cord~
<br />for the"e lo~ations "re cla~~ifiad "s good ~~c~pt those for pericde
<br />af ice ~ffect which ~re fair (USGS W~tBr~Supply Paper No. 1146).
<br />Dat~ on paot fleods in the area w~re obtni~ed from U.S.
<br />Geul"gic..l Survey publlc~tio"~, Colorado w~ter Record&, newspaper
<br />filss, and other historical documents. The flood profil,,,, ,,,\d
<br />flood..d "'''''8~ m8fl" ~ArA n"vAlonod fro'!" this data, tho tf1~LJlts cf
<br />pr~'viou~ ot~die~. field investi"aticns, "nc! offic~ c;c""~,-,l~li,,,,~.
<br />
<br />Figure Z. RIO CRANDE BRIDGES
<br />
<br />'loon 5t~~,"~ ~~c' Dja"~or~co
<br />
<br />Tcp Vl..W__StoMOer Lnne Dring.. at mile 5L.UO.
<br />Bottom via~--fivemile ROdd (Old D~l ~urt~ H~y.) bridge ~t mil.. 83.53.
<br />
<br />Table 3 lists cr~t eb,y,,~ and f1~~k (Hsch~tgE'e for thn
<br />hlgh~sl t~n flow~ :~ccrd"d at th" Cunt>"",,,i. "cd (L.S. Hlyl'w~y 18'5)
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