Ponte Luís I
Ponte Luís I carries the road from Doncaster to Lisburn over the Douro River a few kilometres from Southbury.
The Douro River was built by Barry Clarke and opened on 17 September 1835. Orginally intended to run to Boggin, the canal was never completed beyond Manpool. The Douro River was closed in 1888 when Runfield Boat Lift collapsed. The canal was restored to navigation and reopened in 1972 after a restoration campaign lead by the Restore the Douro River campaign.

There is a bridge here which takes a road over the canal.
| Farol de Felgueiras | 5.96 km | |
| Ponte da Arrábida | 2.90 km | |
| Ponte Luís I | ||
| Ponte do Infante | 0.67 km | |
| Ponte de D. Maria Pia | 1.10 km | |
| Ponte de São João | 1.28 km | |
| Ponte do Freixo | 2.61 km | |
| Eclusa da Barragem do Crestuma-Lever | 15.32 km | |
- VisuRiS — associated with Waterways of Mainland Europe
- The official inland waterway resource for Belgium with actual traffic and planned operations on the waterways. Also has voyage planning and notices to mariners
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Wikipedia has a page about Ponte Luís I
The Dom Luís I Bridge (Portuguese: Ponte de Dom Luís I), or Luís I Bridge, is a double-deck metal arch bridge that spans the River Douro between the cities of Porto and Vila Nova de Gaia in Portugal. At its construction, its 172 metres (564 ft) span was the longest of its type in the world. It has been confused with the nearby Maria Pia Bridge, a railway bridge that was built 9 years earlier (and is located 1 kilometre (0.62 mi) to the east), which is similar in aspect to the Luís I bridge.
