The Luís I Bridge (Ponte Luís I) is a metal arch bridge that spans the Douro River between the cities of Porto and Vila Nova de Gaia in Portugal. At the time of construction its span of 172 m was the longest of its type in the world.
The Government held a competition for the construction of a metallic bridge over the Douro River on a site that was adjacent to an existing bridge and would replace it. Téophile Seyrig had already engineered the D. Maria Pia Bridge project nearby, whilst working as a partner of Eiffel.
He now took sole responsibility for the new, major Luís 1st Bridge. The
construction was begun in 1881 and the bridge opened on 31 October
1886.
- Total length 385.25 m
- Weight 3045 tons
- The arch measures 172 m in length and 44.6 m in height
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