The Grand Avenue Bridge in New Haven, a historic movable swing span originally opened in 1898, required major rehabilitation to extend its service life and significantly reduce long‑term maintenance needs. As part of a nearly $25 million improvement program, STV provided construction engineering and inspection services to guide the careful restoration of this critical community link over the Quinnipiac River. The project preserved the bridge’s historic character while modernizing its structure, deck system and mechanical components.
What challenges did STV address?
The aging swing span and approach structures required extensive upgrades to meet modern performance, load capacity and durability expectations. The bridge’s mechanical systems and bridgetender operations also needed modernization after decades of wear. Maintaining traffic operations and protecting the historic structure added layers of complexity to sequencing, inspection and quality assurance.
What solutions did STV deliver?
STV oversaw the extension of approach spans on both sides of the bridge, eliminating two spans and reducing future maintenance needs. The swing span received a full floor system replacement with new stringers and a composite exodermic deck topped with a polyester polymer concrete overlay. This lightweight, high‑strength system enhanced durability and load capacity while reducing structural weight. STV also inspected the repair and replacement of mechanical components and the installation of new state‑of‑the‑art controls within the fully renovated bridgetender’s house.
How does this project benefit the community?
The rehabilitation improves reliability, reduces maintenance costs and preserves an iconic movable bridge that serves residents, workers and visitors in New Haven. The upgrades extend the bridge’s lifespan for decades, ensuring continued access across the Quinnipiac River while honoring a historic asset central to the city’s identity.
Key stats and accolades
- Composite exodermic deck with polymer concrete overlay
- Approach spans extended to remove two existing spans
- Mechanical repairs and full control system modernization
- Renovated bridgetender’s control house
