Dom Luís Bridge, Porto

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Dom Luis I bridge

Carries	Light rail (tramway) bridge / metro rail bridge Road bridge
Crosses	Douro River
Locale	Porto to Vila Nova de Gaia
Design	two-hinged double-deck arch bridge
Longest span	172 metres (560 ft)
Total length	385.25 metres (1,263.9 ft)
Height	44.6 metres (146 ft)
Beginning date of construction	1881
Completion date	1886
Opening date	1886-10-31
Coordinates	41°08′24″N 8°36′34″W / 41.139863, -8.609336Coordinates: 41°08′24″N 8°36′34″W / 41.139863, -8.609336

The Dom Luís 1st Bridge is an arch bridge that spans the Douro River between the cities of Porto and Vila Nova de Gaia. 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 on the Douro River on a site that was adjacent to an existing bridge and would replace it. Teófilo Seyrig had already engineered the D. Maria Pia Bridge project, whilst working as a partner of Eiffel. He now took sole responsibility for the new, major Luis 1st Bridge. The construction was begun in 1881 and the bridge opened on 1886-10-31.