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<br />.
<br />
<br />u.s. High'my 50 8yp~ss cr<>~"€s tho ;;tra~mb"d ever two
<br />t10_foot ~_sp~n bridg€u, 9kewPd 20 d~gre~s, whioh "t~nd sid~.by-
<br />side to provide for 2_1~na saot and ~cstbound tr~ffio. The ro~d-
<br />
<br />"my wOC;ld not bA in,;nd~tBd by
<br />
<br />tho St~ndd,d Project or the Inter_
<br />lO$$~$ ~t :ne brioge ~oul~ Oe 5.1
<br />
<br />,edi~t~ Region~l flood.
<br />
<br />Head
<br />
<br />feet during ths St~nd~rd Projoct flood ~nd 4.5 foe~ d~:ing th~
<br />lnt~rm"diate HBgional flood.
<br />T~bla 4 li~ts pertinent elev~tions fot ths bridge",
<br />~nd rsl~tes thoir unoetclgar~nce elev~tion to thB crest of the
<br />Intsrmedi~te Regi~n~l flood. A discussion of th~ vatieble con~
<br />ditions which G~n affAct th8 d"pth of floodwaters at bridges w~s
<br />furnished in the earU"r t~xt perhining to bridges e~ross Wild
<br />Horsc-Dry Cre~k.
<br />
<br />Obstru~tions to Floodflow
<br />The effect of obstru~tions due to bridges and their
<br />~ppro~eh fills has bS~11 dog~rib~d in previo'-~ pa,,~yrophs. There
<br />~,.~ no significant obstructinn~ to flaodflows along the Dry Crock
<br />study ,And" at thn pr,wnnt tirr,e.
<br />
<br />Flood R~"ordQ
<br />
<br />Thp.r" ~r8 no r..""ras of ~tl-",,", ~h""u 0'- dio"huru""
<br />
<br />avail"ble for Dry Ct~ok. ~ithout Euch d~ta, the r"t~ of rise,
<br />duration, and velocitios of past floGd~ ~an~at be accurately
<br />
<br />d"te~"incd.
<br />
<br />lf1formatio~ on p~9t flood" in th" are~, al; ~vail~blc
<br />in na\IJsp"p"r fUll" ~nd oth,,~ histori~"l da~u","nts, is ,,1 most
<br />oxcl~eively ~on~erna~ with th" l"rger ~~pe~t$ of floodin~ on tho
<br />
<br />At'kar""",Hillerorfo,mtainCr"pk.
<br />
<br />Ihe fio,,'" pl'utJ-lcs ana floooea
<br />
<br />arO~$ m"ps were rlevdo>,od from the reo'~it~ of p"eViOU6 stl di"6,
<br />
<br />field invMtigetions, and nffic"computationo.
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