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oJ�pTiory FpA M Bridge Structural Design Sen4ces Construction Staging and Traffic Control First Street has approximately 32,000 vehicles per day crossing this bridge, therefore maintaining traffic will be essential. As the existing southerly structure is only 19 -feet wide it will not provide for the maintenance of traffic and pedestrians in a single stage of work. We have developed a two stage approach to resolve this issue, as described below and shown in Figures 1 and 2. Stage 1: To provide adequate room for one lane of traffic in each direction plus pedestrians, the northerly structure will require a partial demolition. By demolishing a 21 -foot portion of the existing bridge, it will allow the construction of a 49 -foot segment of the new northerly structure. During this construction, a five-foot pedestrian walkway will be provided separated by temporary k -rail from the vehicular traffic and a chain link fence would be affixed to the existing guard rail to provide additional safety at the edge of the bridge. One lane of traffic in each direction will be maintained with 13 -foot lanes. Adequate distance exists to safely transition the traffic to the south, and access will be maintained to adjacent properties at all times. The mobile home park in the northeast DMJM HARRIS I AECOM quadrant will require 2 phased approach to construct the new driveway to maintain access. Additional work in this phase will include the retaining wall construction adjacent to the aforementioned mobile home park, the construction of the roadway approaches on the north side of First Street, and the realignment of the maintenance access road to the river. Stage 2: Traffic will be transitioned onto the newly constructed north half of the structure, and the pedestrians will use the new northerly sidewalk. Ample room exists for 14 -foot lanes to provide additional room for the vehicles adjacent to the curb and the temporary k -rail. Access will be maintained to all adjacent parcels during this stage of work. The remaining 20 -feet of the existing northerly structure will be demolished and the final portion of the northerly structure will be constructed, along with the southerly 7.5 -foot widening. The roadway and slope work for the approaches will also be constructed on the south side of First Street. 1 -figure 7. DMJM Harris has developed a 2 -stage approach to resolve maintenance of traffic and provide a pedestrian walkway 04601 324.5557