Opened on 5 March 1850, the original Britannia Bridge (Pont Britannia in Welsh) was designed by Robert Stephenson as a railway bridge, consisting of parallel wrought iron tubes supported by the stone towers.
On 23 May 1970, a fire broke out in the tube at the mainland end, spreading across the whole bridge and making the tubes unsafe. It was subsequently rebuilt in its current form, as a two-decked arched bridge, retaining the original piers. The lower deck, carrying the railway (now single track), was opened on 30 January 1972, although the upper deck, carrying a wide single carriageway A55, did not open until 1980.
Grade II listed (and retaining the status, despite the rebuilding, because of the bridge piers) - see
Link.
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