Britannia Bridge opens over the Menai Strait (1850)

The Britannia Bridge, a wrought iron tubular structure designed by Robert Stephenson, opened over the Menai Strait in Wales on 5 March 1850. It provided the first direct rail link between Anglesey and the mainland, facilitating travel from London to Holyhead. The bridge's construction involved complex engineering to meet Admiralty height requirements, culminating in the fitting of the last rivet by Stephenson himself.

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Background and detail

Background. Prior to 1850, the Menai Strait was crossed only by the road-focused Menai Suspension Bridge. The growing popularity of rail travel necessitated a direct link for the Chester and Holyhead Railway. Robert Stephenson, appointed chief engineer, designed a tubular bridge to satisfy Admiralty requirements for high clearance, allowing passage of fully rigged warships.

Construction. Stephenson's design featured rectangular wrought iron tubes supported by masonry piers. The construction method derived from contemporary shipbuilding practices. The tubes were maneuvered into place between June 1849 and February 1850. The project required significant engineering studies to ensure the tubular concept could support rail traffic while meeting height constraints.

Opening. The bridge's official completion was marked on 5 March 1850, when Robert Stephenson fitted the last rivet. Rail traffic began on a single tube on 18 March 1850. The structure connected Anglesey to the mainland, forming a critical link for trains traveling between London and the port of Holyhead.

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