Isambard Kingdom Brunei designed a lock and 70 Tonne swing bridge of novel design in 1849, sited at the lowest vehicular crossing point on the River Avon in Bristol, at Cumberland Basin, the western entrance to the Floating Harbour. In the 1870's the bridge was shortened and relocated over a new entrance lock constructed where it served for well over looyears. It still survives, lying derelict underneath the Plimsoll swinging road-bridge that superseded it in 1965.
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