An archaeological site of industry
The Iron Bridge crosses the River Severn in Shropshire, a county whose geology made it a center of the Industrial Revolution. At the end of the last Ice Age, glacial meltwaters carved the Ironbridge Gorge, exposing valuable deposits of coal, iron ore, limestone, and fireclay. These resources fueled the area's industrial growth. The region is the birthplace of modern industry and was designated a UNESCO World Heritage Site in 1986. This designation helps preserve the area's industrial archaeology, which includes the bridge and preserved factories, furnaces, workers' housing, and transport infrastructure like canals and tramways.
Construction of the bridge starts with the Darby family dynasty of ironmasters. In 1709, Abraham Darby I pioneered a new method for smelting iron at nearby Coalbrookdale. He used coke, a coal-based fuel, instead of charcoal. This innovation made the mass production of cast iron economically feasible and accelerated the iron trade. Decades later, as local industry boomed, the need for a sturdy bridge across the busy River Severn became apparent. In 1773, Shrewsbury architect Thomas Farnolls Pritchard proposed a radical idea: a bridge made entirely of cast iron. After Pritchard's death in 1777, Abraham Darby III, the grandson of the innovator, completed the project completion.