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<br />\1'1-11 <br /> <br />\I'i'12 <br /> <br />5, <br /> <br />TABLE ~ 1-2 <br />SUMMAR( OF ROAO~A( CROSSINGS <br /> <br />)inc~ the solution descrio~d is exp~nsiH~ and would r<!quirt' som<< time to <br />implement, som.? int.?rim f100d damage mitigation measures can be taken. <br />These meaSlln~s would inc lude strengthening the bridge deCk anchoring <br />systems and providing air v~nt ing to minimize upl ift and b,lOyancy for- <br />ces. <br /> <br />Street <br /> <br />A letter report from Jor~ensen and Hendrickson is included in Appenoix <br />C, <br /> <br />SUM~RY OF ROADWAY CROSSINGS <br />The roadway and pedestrian oridge crussings along ClearCr"ek l1avebeen eVd- <br />ludted using the UrOdn Ordinage dnd Flood Control District's crlterid for <br />d llowaole o~pth of overtopping for the 100-year flood (Reference 32). The <br />loo_yedrwatersurfdceelevationswerecalculdted by hand at Ford Street dr"ld <br />Washir"lgton Avenue, while the water surface elevations at the r~naining bridge <br />locations were obtair"led from tile Flooo Hazard Area Delineation Study <br />(Referenc<<l). A listing of the CledrCreek bridge crossings is presented in <br />fable n-2. Six incl1es of depth or less over roao crowns is yeoerally safe <br />for emergency v':!hicle travel and is not 1 i~ely to float venicles or caus~ <br />~od i ly injury. ~owever, along Clear Cre~k flood flow v"loclt ies are ex- <br />tremely hign in the channel lone. <br /> <br />U.S.6 <br />Golden Peoestridn Bridge <br />Washington Avenue <br />Ford Street <br />'Iasquel Street <br />Cra',;fordStreet <br />Coor, Power Bldg. Ped. Bridge <br />Coors Greenhouse Ped. Bridge <br />C&SRailroadBridge <br />Coor, Bridge No.3 <br />Mclntyre$treet <br />Coors Translodd RR Bridge <br />Interstate 70 Bridges <br />Youngf\tJldStreet <br /> <br />ioIhen flood flow<; along Clear CreeK come in contact with d bridye spdn, hign <br />impact forces result, and these are increaseD when deDris is deposited <br />against the bridge. rhese impact forces Mve been discussed in detdil for <br />Ford Street and washington Avenue, and dr~ pot~nt ially dangerou, for the <br />lOO-yedr f lOad at Vasquez Street, Cr~..ford Strt:et, th<< Coors ped~stria" <br />;)r~dges, ~~~ ~nc Coor, rrdr.slc~d Railroa<i nridz... <br /> <br />Relationship()f <br />lOO.YNr 10.5. <br />to Crown of Road <br />Designation (+ft. above,-ft. under) <br /> <br />Allowat> l~ Depth <br />~f Flow Over <br />Crown for <br />100_yr.Flood <br /> <br />Freeway <br /> <br />-25.0 <br />5,J <br />+2.1 <br />+0.8 <br /> <br />A <br />'fA <br />A <br />A <br />B <br />B <br />I~I A <br />N/A <br />,~/A <br />B <br /> <br />Arteridl <br />Arterial <br />Collector <br />Collector <br /> <br />+0.5 <br />+1.7 <br />+ 2.0 <br />+3.0 <br />7,0 <br />5,5 <br />-24.3 <br />+1.0 <br />-10.5 <br />-15.3 <br /> <br />, <br /> <br />Collector <br />Arterial <br /> <br />. <br />^ <br /> <br />'fA <br /> <br />. <br />^ <br /> <br />Freeway <br />Arterial <br /> <br />As6incllesor less over crown of road <br />6: lB incnes or les, over gutter flowline <br /> <br />FLOOD DAMAGES <br />Tne flood profil"s for tht: 10-year and lOO-year floods were used to determine <br />the exte~t ~~a <ie:.>t" Of flooding fnr ~ach fr~>Juencv. Flood d<!pth, for both <br />frequencies were then related to the ground and fir,t floor levels of struc- <br />tures..ithin theflood,lldin. Structure..levationsweredetermined by field <br />survey. Flood oamdyes wer~ tnen est imdted and t<lbulated on a reach by redch <br />basis according tv the ty~e of structure. For the case of vacant parce I s of <br />1 dnd with in the f 1 ooop 1 ~ in, no future flood daffidges wefe prOjected, <; ince <br />deve\opllent of thes,:, pdrcel s '~ould either not be aliaweo or strict ly con- <br />trolled by the following: <br />