[Updated, with many thanks to “Mercator” for a helpful comment.] The 1915 gateway of the 1883 Smithfield Street Bridge, as seen through the snow of a January afternoon. The Pauli or lenticular truss is unusual; in Pittsburgh, with its more than 500 bridges, this is the only one. The oldest steel bridge in the United States, this was designed by Gustav Lindenthal, who knew a thing or two about bridges. The original span was half the width; for the better part of the twentieth century, the bridge carried automobiles on the downstream side and streetcars on the upstream side. In the 1990s (after the streetcars had been rerouted into the subway by way of the Panhandle Bridge), the bridge was refurbished and painted in bright Victorian colors to replace the utilitarian gray that had coated it for decades. This is our most popular bridge for pedestrians; it connects downtown with the shops and restaurants at Station Square.

Two pictures of the Smithfield Street Bridge, both taken with the same toy digital camera.

Lenticular or “scissors” trusses (sometimes called “Pauli trusses”) are rare on bridges anywhere. This is one of the great examples in the United States. The bridge was designed by one of the great names in bridge-building, Gustav Lindenthal. Until the 1980s, the dowstream side carried automobiles and the upstream side streetcars, but the streetcars were rerouted over the Panhandle Bridge when the subway downtown opened. After a major restoration, the bridge now caries automotive traffic on both sides.

If you are a bridge lover, Pittsburgh is the one city you must see before you die. There are more bridges here than in any other city anywhere, and for a considerable time there was actually a government body here charged with seeing that new bridges were not only practical and safe, but aesthetically beautiful as well. An excellent introduction to the bridges of Pittsburgh is at pghbridges.com.