Willis Avenue Bridge?-?Manhattan, N.Y.
Built in 1901, the Willis Avenue Bridge over the Harlem River carries more than 70,000 vehicles a day. Age, weather and heavy use of this swing bridge led the New York City Department of Transportation to award a $644 million contract to a Kiewit-led joint venture to replace the existing bridge with a new swing bridge immediately to the south, including ramps and approaches.
Traffic continued to flow on the existing bridge while the new bridge was constructed, resulting in minimal impact to vehicular and marine traffic. The team fabricated and assembled the new swing span offsite and floated into place when crews completed construction of the foundations and piers.
The project scope included excavation, backfill, utilities, electrical work, lagging, painting, masonry and demolition of the existing bridge. The work also included constructing parapets, caissons, precast footing boxes, a fender system, sheet-pile cofferdams, concrete footing and concrete piers.