The Patroon Island Bridge project involved the rehabilitation of the 1,797-foot six-lane bridge, and the Interstate I-90 / Interstate I-787 Interchange which is comprised of the eight (8) ramp bridges at the western end of the superstructure. This river crossing carries an average of 70,000 ADT in an east-west direction over the Hudson River between Albany and Rensselaer Counties, with 84,000 vehicles using I-90 / I-787 Interchange on a daily basis. The project, as part of the New York States Accelerated Bridge Construction Program, required that any disturbance of traffic be mitigated during each construction stage. In order to minimize the traffic impact, the majority of construction activities required nighttime operations. During the nighttime construction, the two-lane, one-lane/two-way method was applied by the use of a movable zipper barrier. This technique enabled vehicles to cross over to one side of the bridge and then return traffic to its normal configuration of three-lanes in each direction for the day-time morning commute. Boswell Engineering, as prime consultant on this extremely complex $148 Million project, performed the requisite Construction Engineering and Inspection services in order to ensure the contractor was in substantial conformance with the provisions of the contract documents. These services included: detailed inspection of the contractor’s work; on-site field testing of materials; schedule review; 3-D modeling of the work-site; and, constant monitoring of the contractor’s MPT.