The design of the bridge was by William Etheridge who also designed the smaller but similar Mathematical Bridge across the River Cam at Queens' College, Cambridge, and had been responsible for the construction of many of the timber centres of the Westminster Bridge while working as James King's foreman. First constructed between 1749 and 1750, this bridge still stands, although it has been rebuilt twice, most recently in 1905. The Old Walton Bridge was supported by four central stone piers connected by three arches built of wooden beams and joists. The span of the central arch was 130 feet (39 m), at the time the widest unsupported span in England (it was surpassed by William Edwards Bridge at Pontypridd). The other two main arches were each 44 feet (13 m), though Dicker later suggested that the design would have allowed for side spans of 70 ft or more. Away from the water were five further small brickwork arches on each side of the river.