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 $612 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.
The project scope includes
excavation, backfill, utilities, electrical work, lagging, painting, masonry
and demolition of the existing bridge. The work also includes constructing
parapets, caissons, precast footing boxes, a fender system, sheet-pile
cofferdams, concrete footing and concrete piers.
Impact to vehicular and marine
traffic was minimal. Traffic continued to flow on the old bridge while the new
bridge was constructed. The new swing
span was fabricated and assembled offsite and floated into place after crews completed
construction of the foundations and piers.
The project is scheduled for
completion in December 2012.
Kiewit, headquartered in Omaha,
Neb., is one of North
America’s largest construction and engineering organizations. With
its roots dating back to 1884, the employee-owned company operates through a
network of offices in the United States,
and abroad. Kiewit offers construction and engineering services in a variety of
markets, including transportation, water/wastewater, heavy civil, power, oil,
gas and chemical, building and mining.