Britannia Tubular Bridge (part in Llanfairpwllgwyngyll Community) is a Grade II listed building in the Gwynedd local planning authority area, Wales. First listed on 3 March 1966. Bridge.
Britannia Tubular Bridge (part in Llanfairpwllgwyngyll Community)
- WRENN ID
- stony-lancet-bracken
- Grade
- II
- Local Planning Authority
- Gwynedd
- Constituency
- Bangor Aberconwy MP: Claire Hughes (Lab)
- Country
- Wales
- Date first listed
- 3 March 1966
- Type
- Bridge
- Address
- Britannia Tubular Bridge (part in Llanfairpwllgwyngyll Community), Treborth, Bangor, Pentir
- OS grid reference
- SH 542 708
- Coordinates
- 53.21502, -4.18425
- Source
- Cadw listing
Description
The Britannia Tubular Bridge, located partly in Llanfairpwllgwyngyll Community, is a Grade II listed structure. The bridge features piers made of rock-faced Anglesey limestone, known as Penmaen marble, set on a plinth, along with Runcorn sandstone and brickwork. Each of the two central water piers stands 67.5 meters (221 feet 3 inches) high from the foundation on the sea bedrock. These piers are constructed with rock-faced coursed stone and have battered sides, topped with an ashlar cornice raised on large corner blocks that create voids for suspension chains over rockers, all designed in an Egyptian Pylon style. The piers are voided, and stone lintels measuring 6 meters (20 feet) long span the rectangular openings for the twin tubes, with bold plat bands at the top and bottom of the tubes. Each side face features a symbolic engineering motif based on linked driving rods. The outer spans connect to similar abutment towers, which are flanked by sculptured lions on high plinths. A large figure of Britannia, designed by Thompson for the center pier, was never completed. The approach face is inscribed with 'Erected Anno Domini MDCCCL Robert Stevenson Engineer'.
The bridge was modified and reopened on June 11, 1980. It now consists of braced rivetted steel section arches with 'N'-truss spandrels spanning between the original piers, and the roadway is supported on stanchions above the railway. The side spans are constructed of reinforced concrete.
Local climate
Britannia Tubular Bridge (part in Llanfairpwllgwyngyll Community) sits in one of the wettest parts of the UK, with an average of 1,210 mm of rain a year. This makes it wetter than 92% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 93% of listed buildings.
It experiences an average of 23 freeze-thaw cycles a year, fewer than 75% of listed buildings. Of these, 11 follow at least 1 mm of rain in the preceding 48 hours. Average temperatures at this location have risen by 0.3°C per decade since 1991.
Averages for 1991–2020; temperature trend 1991–2025. Figures describe the wider area (a grid cell of roughly 10 km), not the individual site. Contains modified Copernicus Climate Change Service information 2026.
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Nearby listed buildings
- Lion on E side of S entrance to Britannia Bridge.
- Lion on W side of S entrance to Britannia Bridge
- Britannia Tubular Bridge (part in Treborth Community)
- Lion on W side of the N entrance to Britannia Bridge
- Lion on E side of the N entrance to Britannia Bridge
- Britannia Bridge Memorial, Churchyard of Church of St. Mary, Llanfairpwll
- Statue of Nelson on shore of Menai Strait
- Church of St. Mary, Llanfairpwll
- Bronwydd
- Ysgol Treborth