Which bridge in Porto, Portugal, has two levels and was designed by Théophile Seyrig?

Porto’s Dom Luís I Bridge has two levels and was designed by the French engineer Théophile Seyrig.

The double-deck metal arch bridge opened in 1886, crossing the Douro River between Porto and Vila Nova de Gaia. Its upper deck now carries Porto Metro trains and a pedestrian path, while the lower deck carries road traffic and also includes pedestrian space.

Seyrig had previously worked with Gustave Eiffel, and the bridge’s large iron arch reflects the advanced metal engineering associated with that era. The structure replaced an earlier bridge and became a defining part of Porto’s historic riverfront.

The Dom Luís I Bridge is sometimes confused with the nearby Maria Pia Bridge, another 19th-century Douro crossing. Maria Pia opened in 1877 and was designed by Gustave Eiffel’s company, but it is no longer used for regular railway traffic.