Britannia Bridge

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Britannia Bridge
Location Map
2673056225 6b00459bf4.jpg
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From: Treborth
To: Llanfairpwllgwyngyll
County
Caernarfonshire
Ceremonial County
Gwynedd
Highway Authority
Welsh Government
Opening Date
1850
(Rebuilt early 1970s)
On road(s)
A55
Crossings related to the A55
Chester Bypass Bridge • Conwy Tunnel • Holyhead - Dublin ferry • Holyhead - Dun Laoghaire ferry • Pen-y-Clip Tunnels • Penmaenbach Tunnels • St Asaph Bypass Bridge
This article is about the bridge linking Anglesey with the Welsh mainland.
For the bridge of the same name located in Porthmadog, see Britannia Bridge (Porthmadog)
.
For the bridge of the same name located in Wigan, see Britannia Bridge (Wigan).

Britannia Bridge was built by Robert Stephenson to carry the Chester and Holyhead Railway across the Menai Strait. It is situated a mile west of Telford's Menai Suspension Bridge and was begun in 1846 and opened in 1850. The original structure was of a type then known as a tubular bridge, which would today be called a box-girder bridge: two rectangular-section wrought iron tubes supported by a series of tall masonry towers, with the rail tracks inside the tubes. This was similar to Stephenson's rail bridge at Conwy but bigger. An alternative proposal involving arched construction was ruled out because of the need to maintain clearance for tall ships below. The strait itself is crossed in two spans, with a central tower founded on the Britannia Rock, from which the bridge gets its name.

The tubes were severely damaged in a fire in 1970 but the towers remained. The bridge was re-built with steel truss arches supporting a new reinforced concrete deck, carrying a single rail track alongside a maintenance access road. The first train after reconstruction crossed in 1972. Work started in 1977 to add a road deck above the railway; this opened in 1980 to carry the A5 which, following completion of the new dual carriageway across Anglesey, was re-designated as A55 in 2001.

The road deck is of WS2 standard and is the only non-dualled section of the A55. In 2007, a public consultation was held on options for dualling the crossing, of which nothing came. In 2016 a new consultation was started (source: BBC News).

Bizarrely, this is not the only road-rail bridge named Britannia Bridge in Caernarfonshire: see Britannia Bridge (Porthmadog).

Links



Britannia Bridge
Related Pictures
View gallery (23)
A55 - Britannia Bridge - Coppermine - 18602.jpgA55 - Britannia Bridge - Coppermine - 18604.jpgPont Britannia - Geograph - 2109.jpgPont Britannia - Geograph - 692277.jpgThe double-decker Pont Britannia road and rail bridge - Geograph - 1430065.jpg