Boswell Engineering, as the prime consultant on this $40.8 Million construction project, provided Resident Engineering and Inspection services for the replacement of the superstructures (deck and steel girders) of the twin bridges carrying Interstate I-84 over the Delaware and Neversink Rivers. These twin crossings each have nine (9) spans, 1,250 feet in length with two (2) travel lanes. In addition, to the superstructure replacement, the concrete decks of the ramp bridges over County Route 15 and County Route 16 were also replaced. The first of the twin bridges was completely closed to traffic while the second structure maintained one lane of eastbound and westbound traffic. This enabled construction to be completed in sequence one bridge at a time. Due to environmental restrictions, construction activities nor equipment were permitted in the Delaware River. Therefore, a work platform was built between the two structures using materials from the first span being reconstructed. This unique system was devised by severing the old deck from its piers and sliding it into the void between the bridges to rest on supports crafted from the old girders. This effectively functioned as a work platform above the river, between the bridges. This innovative process of utilizing the platform allowed each of the two spans to be constructed in a single construction season.