Geometrically Inventive: The World’s First Cast Iron Bridge 1779

Iron Bridge 4

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I rather miss having the Iron Bridge on our doorstep. It’s now a good hour’s drive across the county from our house in Bishop’s Castle.  We used to like wandering along the Wharfage beyond the bridge, gazing up at the hanging woodland along Benthall Edge. It’s a great place for promenading, or at least it is when the River Severn is safely in its bed.

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River Severn on the rise

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The Iron Bridge, though, has withstood the most tremendous deluges, including the great flood of 1795 that took out most of the old stone bridges from Shrewsbury to Worcester. It was a show of resilience that proved to anyone who had doubted the capacities of large cast iron structures, that its builder, Abraham Darby III, had been right all along: cast iron was the material of choice for the industrial age.

Nor did its adoption take long. Soon it would be used to build the frames of factories; seen as a boon for the owners of textile mills whose combustible raw materials made them prone to ruinous conflagration. The several-storeyed iron-framed buildings that ensued were forerunners for the skyscrapers of the modern age.

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On closer inspection, though, Abraham Darby’s ‘world wonder’ innovation came with more than a hint of sticking to the tried and trusted. After all, the man was an ironmaster, from a dynasty of ironmasters, and thus a pragmatist, and while the use of cast iron for so big a project was breaking new ground, the hundred foot span was achieved by the jointing of over 1,700 castings, some weighing over 5 tons, and using centuries’ old woodworking techniques of dovetail, mortise and tenon joints.

Besides, there was something else he was wanting to prove: that a bridge with a single arch could be made to span a waterway, busy with large sailing barges. To achieve this meant another significant breakthrough: the Severn trows could pass beneath without the nuisance of lowering their masts.  It was all good for publicity.

Iron Bridge The cast iron bridge near Coalbrookdale View of William Williams 1780

‘The Cast Iron Bridge near Coalbrookdale’  by William Williams 1780

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The bridge and the foundries, furnaces and forges of Coalbrookdale became the tourist venue of the age. Engineers, ironmasters, industrial spies and scores of artists flocked to wonder at what many likened to a vision of hell. The William Williams image above was painted a year before the official opening of the bridge to the general public. You can see three trows moored along the right hand river bank.

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And of course, as a World Heritage site, the Iron Bridge is still a huge tourist attraction, seen here spanning a quiet and sluggish summer river.

GeometricJanuary Day 11

43 thoughts on “Geometrically Inventive: The World’s First Cast Iron Bridge 1779

  1. Take solace in the fact that although you are far from the iron bridge you can now visit things in and around Bishop’s Castle, Like:
    The Three Tuns Brewery
    Lydham Friday Market
    Poetry Pharmacy
    Bishop’s Castle Arts Festival

    1. Oh yes, Thom – thank you for summoning all those favourite places, which are indeed on my doorstep, or almost, And then there’s that ‘iron’ elephant up the hill (a similar shade indeed to the bridge). And then the hill views…so much to be glad about 🙂

      1. I neglected to mention the elephant. I read your post about him, just the other day. Bridges are interesting and even helpful when you need to cross the river but, IMO elephants and poetry are much more entertaining.

  2. What a glory, Tish.

    The Williams painting is also marvelous: the bridge, the church, the belching factory chimney and men in boats not afraid of having built structures so much larger than themselves not for worship or for remembrance but to aid and abet the living of ordinary lives. England in short, I suppose, Tish, in one painting. What a glory!

    1. It does have a very big history, Anne. Another part of the story is that it replaced a very dangerous ferry crossing. Many of the Coalbrookdale workers came from across the river in Broseley, so the bridge would have made a huge difference to them.

  3. It’s years, no decades, since I saw the Iron Bridge! It certainly fits the bill for geometry and your sepia square has an interestingly abstract look 🙂 I never knew that it was put together using techniques taken directly from woodwork!

  4. This is a great history/story of the World first cast iron bridge. And how nice it took place in this square-geometry challenge. Your photographs so impressive. I loved them. And also the painting in 1780 so beautiful. There is not so much change between past and present time. The nature is still there, and the bridge too and also I can’t see concrete hills around the river… I am really impressed. I can’t put any painting(even any photograph) from the past about my country that you can find in present time too. Thank you, Love, nia

    1. Thank you for that lovely comment, Nia. It is extraordinary that this valley, where so much of the technology that fuelled the industrial revolution took place, is still such a picturesque place, and the landscape so little changed.

  5. I spent my career as a bridge inspection engineer and in 1999 I traveled from the USA (Montana) to visit Iron Bridge. An experience that I’ve never forgotten. Thank you for this article that brought back such a wonderful memory .

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