Craigellachie Bridge is a

cast iron Cast iron is a class of iron– carbon alloys with a carbon content more than 2%. Its usefulness derives from its relatively low melting temperature. The alloy constituents affect its color when fractured: white cast iron has carbide impuri ...

arch bridge An arch bridge is a bridge with abutments at each end shaped as a curved arch. Arch bridges work by transferring the weight of the bridge and its loads partially into a horizontal thrust restrained by the abutments at either side. A viaduct ...

across the

River Spey The River Spey (Scottish Gaelic: Uisge Spè) is a river in the northeast of Scotland. At it is the eighth longest river in the United Kingdom, as well as the second longest and fastest-flowing river in Scotland. It is important for salmon fishi ...

at Craigellachie, near to the village of

Aberlour Aberlour ( gd, Obar Lobhair) is a village in Moray, Scotland, south of Elgin on the road to Grantown. The Lour burn is a tributary of the River Spey, and it and the surrounding parish are both named Aberlour, but the name is more commonly used ...

Moray Moray () gd, Moireibh or ') is one of the 32 local government council areas of Scotland. It lies in the north-east of the country, with a coastline on the Moray Firth, and borders the council areas of Aberdeenshire and Highland (council area), ...

Scotland Scotland (, ) is a country that is part of the United Kingdom. Covering the northern third of the island of Great Britain, mainland Scotland has a border with England to the southeast and is otherwise surrounded by the Atlantic Ocean to ...

. It was designed by the renowned

civil engineer A civil engineer is a person who practices civil engineering – the application of planning, designing, constructing, maintaining, and operating infrastructure while protecting the public and environmental health, as well as improving existing ...

Thomas Telford Thomas Telford FRS, FRSE, (9 August 1757 – 2 September 1834) was a Scottish civil engineer. After establishing himself as an engineer of road and canal projects in Shropshire, he designed numerous infrastructure projects in his native Scot ...

and built from 1812 to 1814. It is a Category A listed structure.

Construction

The bridge has a single span of approximately and was revolutionary for its time, in that it used an extremely slender arch which was not possible using traditional

masonry Masonry is the building of structures from individual units, which are often laid in and bound together by mortar; the term ''masonry'' can also refer to the units themselves. The common materials of masonry construction are bricks, building ...

construction. The ironwork was cast at the Plas Kynaston iron

foundry A foundry is a factory that produces metal castings. Metals are cast into shapes by melting them into a liquid, pouring the metal into a mold, and removing the mold material after the metal has solidified as it cools. The most common metals pr ...

Cefn Mawr Cefn Mawr () is a village in the community of Cefn within Wrexham County Borough, Wales. Its name translates as "big ridge".Mills, D. ''A Dictionary of British Place Names'', OUP, p.104 The population in 2001 was 6,669, increasing to 7,051 i ...

, near

Ruabon Ruabon ( cy, Rhiwabon ) is a village and community in Wrexham County Borough, Wales. The name comes from ''Rhiw Fabon'', ''rhiw'' being the Welsh word for "slope" or "hillside" and ''Fabon'' being a mutation from St Mabon, the original church ...

Denbighshire Denbighshire ( ; cy, Sir Ddinbych; ) is a county in the north-east of Wales. Its borders differ from the historic county of the same name. This part of Wales contains the country's oldest known evidence of habitation – Pontnewydd (Bontnewy ...

William Hazledine William Hazledine (1763 – 26 October 1840) was an English ironmaster. Establishing large foundries, he was a pioneer in casting structural ironwork, most notably for canal aqueducts and early suspension bridges. Many of these projects were c ...

, who cast a number of Telford bridges. The ironwork was transported from the foundry through the

Ellesmere Canal The Ellesmere Canal was a waterway in England and Wales that was planned to carry boat traffic between the rivers Mersey and Severn. The proposal would create a link between the Port of Liverpool and the mineral industries in north east Wales ...

and Pontcysyllte Aqueduct then by sea to Speymouth, where it was loaded onto wagons and taken to the site. Testing in the 1960s revealed that the cast-iron had an unusually high

tensile strength Ultimate tensile strength (UTS), often shortened to tensile strength (TS), ultimate strength, or F_\text within equations, is the maximum stress that a material can withstand while being stretched or pulled before breaking. In brittle materials ...

. This was probably specified by Telford because, unlike in traditional masonry arch bridges, some sections of the arch are not in compression under loading. At each end of the structure there are two high masonry mock-

medieval In the history of Europe, the Middle Ages or medieval period lasted approximately from the late 5th to the late 15th centuries, similar to the post-classical period of global history. It began with the fall of the Western Roman Empire a ...

towers, featuring arrow slits and miniature crenellated battlements.

History

The bridge was in regular use until 1963, when it was closed for a major refurbishment. A plaque records the completion of this work in 1964. The side railings and

spandrel A spandrel is a roughly triangular space, usually found in pairs, between the top of an arch and a rectangular frame; between the tops of two adjacent arches or one of the four spaces between a circle within a square. They are frequently fill ...

members were replaced with new ironwork fabricated to match the originals. A 14

ton Ton is the name of any one of several units of measure. It has a long history and has acquired several meanings and uses. Mainly it describes units of weight. Confusion can arise because ''ton'' can mean * the long ton, which is 2,240 pounds ...

restriction was placed on the bridge at this point. This, along with the fact that the road to the north of the bridge takes a sharp right-angled turn to avoid a rock face, made it unsuitable for modern vehicles. Despite this, it carried foot and vehicle traffic across the

until 1972, when its function was replaced by a

reinforced concrete Reinforced concrete (RC), also called reinforced cement concrete (RCC) and ferroconcrete, is a composite material in which concrete's relatively low ultimate tensile strength, tensile strength and ductility are compensated for by the inclusion ...

beam bridge Beam bridges are the simplest structural forms for bridge spans supported by an abutment or pier at each end. No moments are transferred throughout the support, hence their structural type is known as '' simply supported''. The simplest beam ...

built by Sir William Arrol & Co. which opened in 1970 and carries the A941 road today. Telford's bridge remains in good condition, and is still open to pedestrians and cyclists. The bridge has been given Category A listed status by

Historic Scotland Historic Scotland ( gd, Alba Aosmhor) was an executive agency of the Scottish Office and later the Scottish Government from 1991 to 2015, responsible for safeguarding Scotland's built heritage, and promoting its understanding and enjoyment ...

and has been designated a civil engineering landmark by the

Institution of Civil Engineers The Institution of Civil Engineers (ICE) is an independent professional association for civil engineers and a charitable body in the United Kingdom. Based in London, ICE has over 92,000 members, of whom three-quarters are located in the UK, whi ...

and

American Society of Civil Engineers American(s) may refer to: * American, something of, from, or related to the United States of America, commonly known as the "United States" or "America" ** Americans, citizens and nationals of the United States of America ** American ancestry, p ...

. In 1994, it hosted a parade upon the amalgamation of The Gordon Highlanders and The Queen's Own Highlanders (Seaforth and Camerons) to form The Highlanders (Seaforth, Gordons and Camerons). A plaque has been fitted to the bridge parapet to commemorate this.

Moray Council The Moray Council is one of the 32 local government councils in Scotland covering the Moray area. History The Moray District Council had been created in 1975 under the Local Government (Scotland) Act 1973. It became one of the newly created sin ...

maintain the bridge, but it is not known who owns it. In November 2017 efforts were started to discover the owner.

Usage in media

The bridge inspired Scottish composer William Marshall to write the popular Strathspey dance in 1814. The bridge was commemorated on a Royal Mail postage stamp in 2015. It also features in the artwork and logos of Spey Valley Brewery who brew an 1814 lager in commemoration of the bridge.

References

Bibliography

* *

External links

Detail on the bridge - Scottish Historical Register

* {{gbmapping, NJ285452 Deck arch bridges Bridges completed in 1814 Category A listed buildings in Moray Listed bridges in Scotland Scheduled monuments in Scotland Bridges by Thomas Telford Road bridges in Scotland Historic Civil Engineering Landmarks Cast-iron arch bridges in Scotland