Bridging Pittsburgh: The Historic Smithfield Street Bridge

Written by Christine Julia Dingzon

Spanning the Monongahela River, the Smithfield Street Bridge is a defining symbol of Pittsburgh’s rich industrial past and engineering innovation. As the oldest surviving bridge in the city, it has witnessed over two centuries of Pittsburgh’s evolution.

The original structure at this site dates back to 1818 when a wooden covered bridge, designed by Lewis Wernwag, was built to accommodate the growing city’s transportation needs. In 1846, engineer John A. Roebling, best known for designing the Brooklyn Bridge, replaced it with an iron suspension bridge. Roebling’s expertise in wire suspension technology contributed to Pittsburgh’s reputation for engineering excellence. However, as the city grew, the need for a stronger structure became apparent.

In 1883, the current steel bridge was completed, designed by Gustav Lindenthal. His use of a lenticular truss design which is characterized by curved, lens-shaped trusses set the bridge apart both visually and structurally. Over the years, the Smithfield Street Bridge has undergone multiple modifications to support increased traffic and maintain safety. In 1891, a third truss was added, and the bridge was further widened in 1911 to accommodate cars and automobiles. Despite modernization efforts, the bridge retains most of its historic charm.

Recognized as a National Historic Civil Engineering Landmark, the bridge remains a crucial link between Downtown Pittsburgh and the South Side. Pedestrians, cyclists, and vehicles cross it daily, experiencing both its functionality and architectural beauty. The Smithfield Street bridge remains a powerful reminder of Pittsburgh’s industrial heritage, standing strong as both a functional crossing and a historic landmark that connects the city’s past with its future.