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M E M 0 ~ AND U M To: Technical CODIllI1ttee, North Metro Travel Task Force From: Bob Paddock Date: February 28, 1986 SUbjeot: BRIDGE SCORING PROCEDURES AND RESUl.TS SUMMARY In the earlY stages of the North Metro Travel study, twelve bridges were eelected tor analysiS. Three of these were existing structures, one was under construction, and eigllt were proposed candidates of ne. right.-of-way at. various locations in t.he st.udy area. Consequently one of the first. tasks of the Tecbn1cal Committ.ee was t.o reduce the nUlllber of possible new bridges from eight to a few choice candidates. The North Metro Travel Task Force Tecbn1cal CODIllI1t.t.ee ran through four separ..t.e bridge scoring exercises. The scoring used criteria ~~t considered bot.h environmental and system concerns. In each instance the eleven candidate river bridge alternatives were ranked on the basis of total points tallied frCIII the criteria sheets. The final scoring exercise included two Bypass alternatives, one upst.ream and one downstream from tile existing TE 169 I Fe;.:! Street Bridge. Interesting enough, the single bj,ghest nted 2:lc! two lowest ratec! bridge candidates remained constant in the.ir respective stanc!ings under eacb scoring exercise. Other bridges were fairly consistent in their scoring, otilers were variable. Although some recom:Dendations ~ be made froll! tile res1l1ts tbus rar, the Committee decided at its last meeting to prioritize tilree corridor segments. As IIlI aid in making recommendat10~ to the Task Force, ti11s memorandum is intended to provide a review and Sum:aal"'Y 0: tbe process under..aken thus far anc! indicate the resuJ.ts 0: eacb phase of the bridge sco~ing effort. ' ,. INITIAL BP.D>GE SCOP.IN:l Four ajor steps were taken in the bridge rating and selection work. Uter eight alternative tr~ic networks were codee! and the forecasted traITic was assigned, MnDOT provided a sum:uary 0: the cIaily volumes eacb bridge canclidate might attract in tile year 2000. J. two-page criteria scoring sheet was than created (Figure 1) to measure eacb bridge'S per:'o=ce. On J2:luary 8 a workshOp was belc! in Brooklyn Center at which each of t.:Ie various br:i.dge alte:-::lat1ves were ratef. '!be ra~~i was cone usi:1g t3e e~~e:'"a scoring sheets. To provide consistency in the ra~'''E exercise, Eo\) llroio-:l of MnDO'l' conducted the workshop with each of Uie a~ected j\::'1sc!1ctiOns. Bob Brown met with Steve Alderson and Bob Paddock 0: the Metro Counc:.l and c!ilScussec! a procedu."e to ra:lk or compa.... the results. ll":at 11&$ decided upo: was to give a .1 score f:lr eaet bene~icia: effect cd E -, 15CO!'E fo:' eac:t 59 .......-