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<br />dive::.-t high flows to the existing basE fJ 01,,' c:hannel invert. The esti- <br /> <br /> <br />mated IOO-year flood plain just downstre<'IJTI .)f 96th Avenue due to diking <br /> <br /> <br />is shown in dashed line on the drawing. <br /> <br /> <br />In this reach the Burlington Northc,-n H.aiL[oad crosses the First <br /> <br /> <br />Creek at Stat.on 218+80, Highway 2 at Slatlon 220+20, Peoria Street at <br /> <br /> <br />Stat:Lon 2l8+3() and 96th Avenue at. StatioTI 21~O+9(). Burlington Northern <br /> <br />Rail,~oad crosses the creek over a bridge h~'ling five spans three of <br /> <br /> <br />which have 13_5' clear span and two of 12c5' clear "pane The 100-year <br /> <br /> <br />flow in the F.rst Creek will pass under the railroad bridge and hence <br /> <br /> <br />no modification is suggested for this bt:idge. Both Peoria Street and <br /> <br /> <br />96th Avenue crossings will have no aded LiOJld 1 st ruc1:ural improvements. <br /> <br /> <br />The lOO-year flood will overtop t_hese tv/Cl roads < For Highway 2 a new <br /> <br /> <br />brid:,e has been proposedc FLood Plair, zon Illg i,; recommended for the <br /> <br /> <br />euti ce reach. <br /> <br />Hig~~_~~ <br /> <br />Highway 2 at present has two SL)-ll diameter eMP openings under <br /> <br /> <br />the :.-oadway. It is proposed to provi.de ~l rll~W bl:idge for Highway 2 in <br /> <br /> <br />oedec to pass the 100-year flow wi thoc.t "vertopping the bridge. The <br /> <br />exis~:ing invert elevation cannot be ],owct"ed as 1_his will a:ffect the flow <br /> <br /> <br />through the existing railroad bridge wllieh lS 11,0 feet downstreamc In <br /> <br /> <br />orde:~ to pass the IOO-year flow withot;.t c,ve.rtopping it is proposed t.o <br /> <br /> <br />raise the existing top of roadway hy 2cO' over a length of 1,600 feet <br /> <br /> <br />and provide a bridge with three spans, (~EICh of ;:3.0'. The height cf the <br /> <br />open:lng will be 8.0' c The First Creel< l'lill be channe Lized on the up_c <br /> <br /> <br />stream side for a length of 500 feet to minlmize ponding. The telephone <br /> <br /> <br />cabl4~ crossing the flood plain at this 1,(lca-:ion has to be relocated, <br /> <br />The reach between 96th Avenue ,md Buckley Road lies in the <br /> <br /> <br />Rock:r MountaiIl Arsenal area. This area ~1a~ not :incorporated in the pre- <br /> <br /> <br />sent flood plain studiesc <br /> <br />[1I-7 <br />