Services: Construction Engineering and Inspection

Location: Westchester County, NY

Boswell Engineering provided construction engineering and inspection services to the New York State Department of Transportation for reconstruction of the Route 9/9A bridge over the Croton River together with extensive roadway approach sections. The contract documents provided for the roadway profile to be raised two feet (2') and the bridge reconstruction performed in three (3) stages. This multi-span structure required steel cofferdams and pumping due to the project location adjacent to the Hudson River and by virtue of the fact that this waterway is subject to tidal conditions. A temporary steel pier was constructed at two (2) locations for staging operations for the reconstruction and widening of the bridge. Piers and abutments were widened and set on steel piles for this continuous four (4) span structure. The new superstructure allowed for four (4) vehicular lanes, a dedicated bicycle path and a walkway. An entire new drainage system was constructed along the bridge and approaches. Maintenance and protection of traffic was an important factor on this high traffic artery and necessitated the precise scheduling of construction operations in order to minimize any inconvenience to the traveling public.

This project also included the construction of a pedestrian overpass bridge spanning Route 9 and the Metro North Railroad. This pedestrian structure was founded on 70' x 3' diameter prestressed concrete piles.