The bridge was the city's tallest structure until 1967. It is the widest bridge in the world. It is the world's largest single-arch bridge, but not the longest (as millions of Australian school children were erroneously taught). The bridge was officially opened on 19 March 1932. The Bayonne Bridge in the United States, opened four months earlier on 15 November 1931, is 70 cm (or 2.3 feet) longer.