History in Structure

Menai Suspension Bridge

A Grade I Listed Building in Menai Bridge, Isle of Anglesey

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Latitude: 53.2204 / 53°13'13"N

Longitude: -4.1635 / 4°9'48"W

OS Eastings: 255652

OS Northings: 371450

OS Grid: SH556714

Mapcode National: GBR 5N.133Y

Mapcode Global: WH547.09PZ

Plus Code: 9C5Q6RCP+5J

Entry Name: Menai Suspension Bridge

Listing Date: 27 May 1949

Last Amended: 18 July 1997

Grade: I

Source: Cadw

Source ID: 18572

Building Class: Transport

ID on this website: 300018572

Location: Spanning the Menai Strait S of Menai Bridge.

County: Isle of Anglesey

Town: Menai Bridge

Community: Menai Bridge (Porthaethwy)

Community: Menai Bridge

Built-Up Area: Menai Bridge

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Menai Bridge


Built 1818 to 1826 by Thomas Telford. This renowned bridge completed the London to Holyhead Turnpike Road. The site was chosen because its steep banks enabled the erection of a high bridge to satisfy the Admiralty's requirements. The construction was a development of Telford's own design for an unexecuted bridge over the Mersey and that by Captain Brown for a bridge over the Tweed. Opened 30 January 1826 - 100ft high (30.5 metres), 28ft ( 8.5 metres) wide roadway and with a single suspended span of 579ft ( 176.5 metres); 130ft (39.6 metres) longer than any previously built bridge. Reconstructed 1938-40 by Sir Alexander Gibb, for Dorman Long and Company. The chains were moved from their original central position to their present location and the toll house on the Anglesey side was demolished, the suspending members being anchored to either side of the new roadway. Work was completed and the bridge freed from tolls on 31st December 1940


Coursed rubble Penmon masonry with ashlar facings to the tapered suspension towers or 'pyramids' from which the deck is hung on a system of 16 chains (originally iron, now steel) with pins. These are carried down at either end to a point deep into the rock. Four arches to Anglesey side and 3 to Bangor side, over tapered piers; voussoirs, impost bands and bracket cornice above. The later metal pedestrian walkways are further bracketed out; originally there was just the narrow central pavement. Each carriageway passes under the towers through semicircular arched openings, matched above by paired blind recesses over inscribed tablets. The handrails continue as far as the low tapered piers with pyramidal caps at each end and on the mainland side trellised railings continue to either side and sweep round to terminate in similar piers with panelled recesses.

Reasons for Listing

Listed Grade I as an exceptional example of early C19 engineering work, remarkable for its structural virtuosity and the resulting aesthetic effect. An essential part of Telford's great scheme to link London and Holyhead.

External Links

External links are from the relevant listing authority and, where applicable, Wikidata. Wikidata IDs may be related buildings as well as this specific building. If you want to add or update a link, you will need to do so by editing the Wikidata entry.

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