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<br />s. �r R,a�iLxa�n �rt�a�E c�oss�r�c
<br />A crossing at the location ofthe Canadian Pac�fc railroad bridge �uresents the mast difhoult cYtallenge to
<br />the constructi�iri af a bicycle �zid pedestt•ian faci�ity along . ,, � � �" "�� �`4 " "`�� '"� �:
<br />M� ,*
<br />Qld �nelling El�enue and �ld Hi�hway I0. TY�e bri�ge `�` �: �. ����,r -
<br />_ �_ � - �t a:�. � ,-
<br />uvas ariginalty cvnstructed in i 929, and was updated iii
<br />�951. The CP R�ilroad was not abie ta pro�i�e any as- .
<br />built inforrnation on the bridge; howe�er, they noted tnat it
<br />was af similar ct�nstr�c#ion to the laridge aaer �ld.
<br />Highway 8 in New Srigh�on whe�e as-E�u�it infarmatian
<br />was a�ailable. ' - -
<br />__
<br />'�`he railroad daes not have re�Ia�emen� af this bridge ,� ;;� � �i� � x � E� � F� F�
<br />listed in ara.y ❑t' its long term canstructivn �lans at this �.�� ..,� ,.,._ a' sz.;����,,�:.': .,�... , r_,��,�,
<br />time, but discussions ha�� continued with the railraad to notify tixem that a trail crossin� is pl�nnec� as
<br />vvell as to inform them of th�e planned methad of crvssing, �rom these discussions the raa,lroaei personnel
<br />have indi�ated thai to proc�ed with this crossing, cansfruction plans would need to be presenteci for their
<br />en�ine�ring reView.
<br />As a part af tne evaluativn proc�ss, a number of differ�nt design alternativ�s �vere consi�iered, in�luding
<br />t�za�e�zng and. retaining wa11 cfl�struction, Tunrieliaig would consist of ��ring a casin� thraugh �e soi�
<br />between fl�e bridge piers and the abutment watl and c�nstructing the trail inside th'rs casirrg. in addiii��,
<br />tunneling woutd require the ins�atlec� af a retaining wali alvng thc roadway to pre�ent shiftin� af'the
<br />casin�. Aiter further �.valuation, xt was determined that the tunnelin� alternative would noi be
<br />ecQnomically feasible. "I'he most c�st effecti�e rnethvd to create a trail erassing at the CP railroad bridge
<br />is by c�nstructing a refaining wall which will �uppart the exi��in� bridg� a6utments, and allow �he trail io
<br />pass b�tween i;hs abutments and the �ridge piers.
<br />It is r�carrrmended tha# #he retaining wall �e constructed by �ast-in�p�ace con�crete. The use o#`mpaular
<br />black was also evaluated; hawever, it is not, likely that t�e requirec� gea-grrd reinfvrcer�.ent would he
<br />feasible due t�a the prox�mity of the existing abutzner�t and piiings.
<br />The retaining wall will neec� to be �anstructed ta accomrnodate an eight fac�t wide trail, and inain#ain ten
<br />feet of Vertic�l clearance �etweEn the trail and the bridge. in ihis sit�a#ivn, tha conditions will n,ot a�low
<br />far the addi#ional twQ ��et of clear space an each side of the tra�1. 5Ee Figure 1S in Appendix A�'or
<br />details an the proposed erossin�. Detail drawin�s for the cr�ssing were original�y prepar�d for t�ie Ci�y
<br />}�y URS Corporation. T�e c€esigns by URS were re�iewec� anc� yerified with LHB and ifwas determined
<br />th�t tl�e ceinc�pt w�.s an ef�ecti�e means ofcr�eatin� the crassing. Durzx�g the final design Qfthe crossing,
<br />a n�amber a�'additional design paramet�rs will n�ed ta �e e�a�Iua�ed t� detezxni�.e the exa�t spe�ifica#ir�ns
<br />of the retainin� wall.
<br />Ai #he time when final design proceeds f'nr t�e cros�ing, CP Railrflad wilT need io be confact�d and tice
<br />f nal design approach wi11 need �o be appra�ed and permitted thraugk� thern. Due ic� tne fact tha# tY�e
<br />bridge i� c�f simil�.r cvnsiru�tion to the bridg� o�er ald Highway S in New Brignton a�zd �P Raiiroad
<br />�ld Stzelling A�ei�ue 1 O�d �-Iighway 1� `Trail �tudy, City afr►,rden Hi1Ps
<br />BMI Projeat No. T1b.1f70325 Page 7
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