This project involved the staged construction and reconstruction of the Route 9 bridge over the Croton River. The project called for widening of the existing structure both left and right hand sides of the travel way which included abutment extensions and three (3) pier extensions located within the waterway. This was accomplished by the construction of and then relocation of a temporary trestle placed parallel with the existing bridge. Temporary steel cofferdams were constructed at each pier to facilitate dewatering, excavation pipe pile installation, and reinforced concrete pier extensions. The existing concrete deck and structural steel were removed, new pedestal installed and new structural steel installed. A new concrete deck was installed along with concrete barrier. Approach work involved concrete approach slabs, asphalt paving, concrete barrier installation, a gravity retained earth system was installed along a tidal marsh, a pedestrian/bicycle path was constructed parallel to the roadway with lighting and a timber pile, timber decked fishing platform constructed.

The project was completed in accordance with the NYSDOT approved modification construction schedule and within the approved budget. The budget did not originally call for a temporary trestle, however constructability problems and relationship concerns with local environmental groups led the NYSDOT to request ECCO III to design and build a temporary trestle system which facilitated construction as well as addressed environmental concerns.