The $640 million Willis Avenue Bridge Replacement program modernized a critical movable bridge over the Harlem River, improving safety, mobility and long‑term structural reliability between Manhattan and the Bronx. The project replaced the original swing‑span and fixed spans, rebuilt two approach viaducts and upgraded complex roadway connections with I‑87, the Major Deegan Expressway and Harlem River Drive. As part of this transformative effort, STV, in joint venture, provided comprehensive resident engineering inspection services to oversee construction of the new movable span and its adjoining roadway network.
What challenges did STV address?
The project required reconstructing a movable bridge and a dense series of ramps woven through existing Triborough Bridge infrastructure, all while maintaining traffic in a heavily traveled urban environment. STV also monitored the construction of a new bikeway and walkway over the Major Deegan Expressway and coordinated full‑depth pavement reconstruction using 50-year PCC pavement. Transporting the 2,400‑ton replacement swing span up the East River added another layer of technical and logistical complexity.
What solutions did STV deliver?
STV provided on‑site inspection, contract administration and quality oversight for all structural, roadway and mechanical components of the replacement bridge. The team supervised construction of multi‑level ramp systems, bridge approaches, new pedestrian and bicycle facilities and streetscape improvements. STV’s field staff ensured proper installation of all materials and systems associated with the movable span and coordinated marine transport and final placement of the 2,400‑ton swing span.
How does this project benefit the community?
The new Willis Avenue Bridge improves roadway geometry, enhances safety and delivers modern multimodal access while reducing long‑term maintenance needs. Its upgraded movable span supports reliable navigation on the Harlem River, and redesigned ramps increase efficiency for motorists, pedestrians and cyclists across the region.
Key stats and accolades
- 2,400‑ton movable swing span floated to site
- Two approach viaducts replaced
- New bikeway and walkway over Major Deegan Expressway
