Windsor Bridge

The Windsor Bridge is a three-span Polygonal Warren truss that was built in 1935. In the first third of the 20th century, New York developed standard details for metal truss bridges, and built them with moderate frequency. New York used Warren and Polygonal Warren truss configurations as the standard (Pennsylvania had a similar program using Pratt and Parker truss configurations). Today, most of these structures are painted the same green color, which enhances the standard appearance of the design.

This standard design uses large members and had a relatively wide deck width for the time. A fair number of them remain, as they are typically strong bridges that are capable of serving modern traffic needs safely and efficiently. In addition, these bridges are highly attractive structures and the crossing something to notice and enjoy.

This bridge is one of the largest, multi-span examples of this design. It does feature a rather unusual alteration, where a small concrete slab is cantilevered off the main deck above the bottom chord. This alteration appears to have been done in an effort to keep water and salt off the bottom chord, and therefore preserve the steel better.

The bridge underwent a major rehabilitation project in 1980, which is likely when the alteration was added. This project included a deck replacement and complete repainting. The project also included minor surface restoration of the piers. However, during construction it was determined that the deterioration was significant (up to 24” deep). A concrete shell was installed around the piers, with through through-shaft posttensioning to clamp the shell to the pier. This is rare (if not unique) process in the United States.