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PATTERSON STREET UNDERPASS -ESTIMATE OF PROBABLE CONSTRUCTION COSTS <br />' EWEB Site <br />This cost estimate assumes that the steam plant and substation adjacent to the proposed <br />Waterfront Drive construction will have been removed when the Patterson Underpass is <br />constructed. It is assumed that any utilities in this area will be relocated or abandoned by <br />~; <br />EWEB as part of the EWEB relocation to a new site. <br />Structures <br />Hwy. 99W Undercrossing <br />Patterson Street roadway will have an overall width of 40 feet with 2 -12 ft. lanes and 2 - 8 <br />'- ' ft. sidewalks. Vertical abutments will be used creating a 40-ft. clear span. The overall span <br />length of bridge will be 44 ft. Vertical clearance will be 14 ft. per City concept plan. <br />The bridge width will be 48 ft. overall with 1 - 6 ft sidewalk, 2 -14 ft. lanes, l -12 ft. <br />bike/pedestrian path with 2 -1 ft concrete parapet bridge rails. Reinforced concrete impact <br />panels, 20-ft section at each approach will be used. <br />The structure will be constructed of prestressed precast concrete slabs with asphalt concrete <br />~; wearing surface. <br />UPRR Undercrossing <br />Patterson Street roadway will have an overall width of 40 feet with 2 -12 ft. lanes and 2 - 8 <br />ft. sidewalks. Vertical abutments will be used creating a 40-ft. clear span. The overall span <br />length of bridge will be 48 ft. Vertical clearance will be 14 ft. per City concept plan. <br />The structure type will be a steel thru-girder to minimize superstructure depth below track <br />and minimize cut for the roadway section. <br />The bridge width will be 19.75 ft. between centerlines of the steel thru-girders. <br />Steel thru-girders are proposed to minimize superstructure depth and are used with <br />- -; concurrence of the City. The superstructure depth will be 4.5 ft from top of track to bottom <br />of bridge girders. The structure will carry one track. <br />A shoofly will be constructed to maintain rail traffic throughout the construction of the new <br />crossing. Temporary shoring between the main-line and shoofly will be required. <br />Railroad <br />A shoofly, which will be required by UPRR, is not included in the structure cost. UPRR <br />provided an estimate for the shoofly that will be a minimum of one quarter of a mile to one <br />half of a mile long on each side of the crossing to maintain rail traffic at normal speed. UPRR <br />will insist that construction of the bridge not impact rail operations. <br />Horizontal and vertical profile grade of track will remain in their current configuration. <br />.! Raising the existing track to minimize roadway excavation was considered but rejected by <br />UPRR due to physical constraints at the viaduct to the northwest and proximity with the <br />existing 8+~ Avenue/EWES crossing. This matter should be pursued with the UPRR/Public <br />'' Utilities Commission and possibly others as time permits. <br />PDX/PATTERSON STREET UNDERPASS TECH MEMO 062504 PAGE 4 OF 6 <br />