The bridge was originally designed to have a single deck, but the design was modified to include two levels to improve traffic flow between the cities.
Théophile Seyrig founded the company that built the bridge, winning the contract over his former partner, Gustave Eiffel.
The upper deck is 60 meters above the average water level of the Douro River.
During the construction process, over 3,000 tons of iron were used for the total structure.
The bridge's name honors King Luís I of Portugal, who presided over the inaugural ceremony.
The Metro line crossing the upper deck is a modern addition that replaced earlier vehicular traffic on that level.
The Luís I Bridge is a double-deck metal arch bridge connecting Porto to Vila Nova de Gaia across the Douro River. Designed by Théophile Seyrig, a former partner of Gustave Eiffel, the structure was inaugurated in 1886. The upper deck carries the Porto Metro Line D and a pedestrian walkway, while the lower deck serves road traffic and pedestrians. It spans 172 meters at its main arch, which was the longest of its kind in the world at the time of construction. The bridge is constructed of iron, reflecting the late 19th-century industrial aesthetic of the city. It remains a critical transit artery and a primary tourist vantage point for viewing the Ribeira district. The structure underwent significant renovations in the early 21st century to accommodate light rail infrastructure.
The pedestrian walkway on the upper deck looking towards the Ribeira district.
Walk the upper deck for the best views, but stay clear of the designated light rail tracks.
Visit the Gaia side to take the cable car down to the riverfront after crossing.
The structure can be very windy; bring a light jacket even on sunny days.
Do not attempt to walk on the light rail tracks on the upper deck, as trams run frequently.
