Referring to http://www.sydneyharbourbridge.info/
The Sydney Harbour Bridge, also affectionately known as the ‘Coathanger’, was opened on March 19th 1932 by Premier Jack Lang, after six years of construction. Made of steel the bridge contains 6 million hand driven rivets. The surface area that requires painting is equal to about the surface area of 60 sports fields. The Bridge has huge hinges to absorb the expansion caused by the hot Sydney sun. You will see them on either side of the bridge at the footings of the Pylons.
Sydney Harbour Bridge is the world’s largest (but not longest as thats the New River Gorge in the USA) steel arch bridge, and, in its beautiful harbour location, has become a renowned international symbol of Australia.
Its total length including approach spans is 1149 metres and its arch span is 503 metres. The top of the arch is 134 metres above sea level and the clearance for shipping under the deck is a spacious 49 metres. The total steelwork weighs 52,800 tonnes, including 39,000 tonnes in the arch. The 49 metre wide deck makes Sydney Harbour Bridge the widest Longspan Bridge in the world.