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The bridge is a cast-iron truss arch bridge. It is built from five sectional cast-iron ribs that give a span of 100 feet 6 inches (30.6 m). The construction of the bridge used 378 long tons 10 cwt (384.6 metric tons). The components of the bridge were put together using carpentry joints such as dovetail, mortise and tenon, and wedge, techniques used in the construction of iron structures of the period. The bridge was designed by Thomas Farnolls Pritchard (1723–1777) and constructed by Abraham Darby III (1750– 1789) from components cast in his ironworks in Coalbrookdale.