Sydney Harbour Bridge

The Sydney Harbour Bridge is a steel through arch bridge across Sydney Harbour that carries rail, vehicular, bicycle and pedestrian traffic between the Sydney central business district (CBD) and the North Shore. The dramatic view of the bridge, the harbour, and the nearby Sydney Opera House is an iconic image of Sydney, New South Wales, and Australia. The bridge is nicknamed “The Coathanger” because of its arch-based design.
Under the directions of Dr J.J.C. Bradfield of the NSW Department of Public Works, the bridge was designed and built by British firm Dorman Long and Co Ltd of Middlesbrough and opened in 1932. The bridge’s design was influenced by the Hell Gate Bridge in New York. It is also the sixth longest spanning-arch bridge in the world, and it is the tallest steel arch bridge, measuring 134 m (440 ft) from top to water level. It was also the world’s widest long-span bridge, at 48.8 m (160 ft) wide, until construction of the new Port Mann Bridge in Vancouver.
There had been plans to build a bridge as early as 1815, when convict and noted architect Francis Greenway reputedly proposed to Governor Lachlan Macquarie that a bridge be built from the northern to the southern shore of the harbour. In 1825, Greenway wrote a letter to the then “The Australian” newspaper stating that such a bridge would “give an idea of strength and magnificence that would reflect credit and glory on the colony and the Mother Country”.
Nothing came of Greenway’s suggestions, but the idea remained alive, and many further suggestions were made during the nineteenth century. In 1840, naval architect Robert Brindley proposed that a floating bridge be built. Engineer Peter Henderson produced one of the earliest known drawings of a bridge across the harbour around 1857. A suggestion for a truss bridge was made in 1879, and in 1880 a high-level bridge estimated at $850,000 was proposed.

Sketches of designs submitted when tenders were called for a harbour crossing in 1900.

Sketches of designs submitted when tenders were called for a harbour crossing in 1900.

In 1900, the Lyne government committed to building a new Central railway station and organised a worldwide competition for the design and construction of a harbour bridge. Local engineer Norman Selfe submitted a design for a suspension bridge and won the second prize of £500. In 1902, when the outcome of the first competition became mired in controversy, Selfe won a second competition outright, with a design for a steel cantilever bridge. The selection board were unanimous, commenting that, “The structural lines are correct and in true proportion, and… the outline is graceful”. However due to an economic downturn and a change of government at the 1904 NSW State election construction never began.

Norman Selfe's winning design at the second competition c.1903.

Norman Selfe’s winning design at the second competition c.1903.

In 1914 J.J.C. Bradfield was appointed “Chief Engineer of Sydney Harbour Bridge and Metropolitan Railway Construction”, and his work on the project over many years earned him the legacy as the “father” of the bridge. Bradfield’s preference at the time was for a cantilever bridge without piers, and in 1916 the NSW Legislative Assembly passed a bill for such a construction, however it did not proceed as the Legislative Council rejected the legislation on the basis that the money would be better spent on the war effort.
Following World War I, plans to build the bridge again built momentum. Bradfield persevered with the project, fleshing out the details of the specifications and financing for his cantilever bridge proposal, and in 1921 he travelled overseas to investigate tenders. On return from his travels Bradfield decided that an arch design would also be suitable and he and officers of the NSW Department of Public Works prepared a general design for a single-arch bridge based upon New York City’s Hell Gate Bridge. In 1922 the government passed the Sydney Harbour Bridge Act No. 28, specifying the construction of a high-level cantilever or arch bridge across the harbour between Dawes Point and Milsons Point, along with construction of necessary approaches and electric railway lines, and worldwide tenders were invited for the project.
As a result of the tendering process, the government received twenty proposals from six companies; on 24 March 1924 the contract was awarded to English firm Dorman Long and Co Ltd, of Middlesbrough well known as the contractors who built the similar Tyne Bridge of Newcastle Upon Tyne, for an arch bridge at a quoted price of AU£4,217,721 11s 10d. The arch design was cheaper than alternative cantilever and suspension bridge proposals, and also provided greater rigidity making it better suited for the heavy loads expected.
To offset concerns about a foreign firm participating in the project, assurances were given by Bradfield that the workforce building the bridge would all be Australians. Bradfield and his staff were ultimately to oversee the entire bridge design and building process, while Dorman Long and Co’s Consulting Engineer, Sir Ralph Freeman of Sir Douglas Fox and Partners, and his associate Mr. G.C. Imbault, carried out the detailed design and erection process of the bridge. Architects for the contractors were from the British firm John Burnet & Partners of Glasgow, Scotland.

Sydney Harbour Bridge under construction.

Sydney Harbour Bridge under construction.

The building of the bridge coincided with the construction of a system of underground railways in Sydney’s CBD, known today as the City Circle, and the bridge was designed with this in mind. The bridge was designed to carry six lanes of road traffic, flanked on each side by two railway tracks and a footpath. Both sets of rail tracks were linked into the underground Wynyard railway station on the south (city) side of the bridge by symmetrical ramps and tunnels. The eastern-side railway tracks were intended for use by a planned rail link to the Northern Beaches; in the interim they were used to carry trams from the North Shore into a terminal within Wynyard station, and when tram services were discontinued in 1958, they were converted into extra traffic lanes. The Bradfield Highway, which is the main roadway section of the bridge and its approaches, is named in honour of Bradfield’s contribution to the bridge.
The building of the bridge was under the management of Bradfield. Three other people heavily involved in the bridge’s design and construction were Lawrence Ennis, Edward Judge, and Sir Ralph Freeman. Ennis was the engineer-in-charge at Dorman Long and Co and the main on-site supervisor (Bradfield visited occasionally throughout the project and, in particular, at many key stages of the project, to inspect progress and make managerial decisions), Judge was chief technical engineer of Dorman Long, and Freeman was hired by the company to design the accepted model in further detail. Later a bitter disagreement broke out between Bradfield and Freeman as to who actually designed the bridge. Another name connected with the bridge’s design is that of Arthur Plunkett.
The official ceremony to mark the “turning of the first sod” occurred on 28 July 1923, on the spot at Milsons Point on the north shore where two workshops to assist in building the bridge were to be constructed.
An estimated 469 buildings on the north shore, both private homes and commercial operations, were demolished in order to allow construction to proceed, with little or no compensation being paid. Work on the bridge itself commenced with the construction of approaches and approach spans, and by September 1926 concrete piers to support the approach spans were in place on each side of the harbour.
As construction of the approaches took place, work was also started on preparing the foundations required to support the enormous weight of the arch and loadings. Concrete and granite faced abutment towers were constructed, with the angled foundations built into their sides.
Once work had progressed sufficiently on the support structures, a giant “creeper crane” was erected on each side of the harbour. These cranes were fitted with a cradle, and then used to hoist men and materials into position to allow for erection of the steelwork. To stabilise works while building the arches, tunnels were excavated on each shore with steel cables passed through them and then fixed to the upper sections of each half-arch to stop them collapsing as they extended outwards. Arch construction itself began on 26 October 1928. The southern end of the bridge was worked on ahead of the northern end, in order to detect any errors and to help with alignment. The cranes would “creep” along the arches as they were constructed, eventually meeting up in the middle.

 HMAS Canberra sailing under the completed arch from which the deck is being suspended in 1930.


HMAS Canberra sailing under the completed arch from which the deck is being suspended in 1930.

In less than two years, on Tuesday, 19 August 1930, the two halves of the arch touched for the first time. Workers riveted both top and bottom sections of the arch together, and the arch became self-supporting, allowing the support cables to be removed. On 20 August 1930 the joining of the arches was celebrated by flying the flags of Australia and the United Kingdom (Australia being very much part of the British Commonwealth) from the jibs of the creeper cranes.
Once the arch was completed, the creeper cranes were then worked back down the arches, allowing the roadway and other parts of the bridge to be constructed from the centre out. The vertical hangers were attached to the arch, and these were then joined with horizontal crossbeams. The deck for the roadway and railway were built on top of the crossbeams, with the deck itself being completed by June 1931, and the creeper cranes were dismantled. Rails for trains and trams were laid, and road was surfaced using concrete topped with asphalt. Power and telephone lines, and water, gas, and drainage pipes were also all added to the bridge in 1931.
The pylons were built atop the abutment towers, with construction advancing rapidly from July 1931. Carpenters built wooden scaffolding, with concreters and masons then setting the masonry and pouring the concrete behind it. Gangers built the steelwork in the towers, while day labourers manually cleaned the granite with wire brushes. The last stone of the north-west pylon was set in place on 15 January 1932, and the timber towers used to support the cranes were removed.

John Bradfield riding the first test train across the bridge on 19 January 1932.

John Bradfield riding the first test train across the bridge on 19 January 1932.

On 19 January 1932, the first test train, a steam locomotive, safely crossed the bridge. Load testing of the bridge took place in February 1932, with the four rail tracks being loaded with as many as 96 steam locomotives positioned end-to-end. The bridge underwent testing for three weeks, after which it was declared safe and ready to be opened. The construction worksheds were demolished after the bridge was completed, and the land that they were on is now occupied by Luna Park.
The standards of industrial safety during construction were poor by today’s standards. Sixteen workers died during construction, but surprisingly only two from falling off the bridge. Several more were injured from unsafe working practices undertaken whilst heating and inserting its rivets, and the deafness experienced by many of the workers in later years was blamed on the project. Henri Mallard between 1930 and 1932 produced hundreds of stills and film footage which reveal at close quarters the bravery of the workers in tough Depression-era conditions. The total financial cost of the bridge was AU£6.25 million, which was not paid off in full until 1988.
The bridge was formally opened on Saturday, 19 March 1932. Amongst those who attended and gave speeches were the state Governor, Sir Philip Game, the Minister for Public Works, and Lawrence Ennis. The Labor Premier of New South Wales, Jack Lang, was to open the bridge by cutting a ribbon at its southern end.

 Francis de Groot declares the bridge open


Francis de Groot declares the bridge open

However, just as Lang was about to cut the ribbon, a man in military uniform rode up on a horse, slashing the ribbon with his sword and opening the Sydney Harbour Bridge in the name of the people of New South Wales before the official ceremony began. He was promptly arrested. The ribbon was hurriedly retied and Lang performed the official opening ceremony. After he did so, there was a 21-gun salute and an RAAF flypast. The intruder was identified as Francis de Groot. He was convicted of offensive behaviour and fined £5 after a psychiatric test proved he was sane, but this verdict was reversed on appeal. De Groot then successfully sued the Commissioner of Police for wrongful arrest, and was awarded an undisclosed out of court settlement. De Groot was a member of a right-wing paramilitary group called the New Guard, opposed to Lang’s leftist policies and resentful of the fact that a member of the Royal Family had not been asked to open the bridge. De Groot was not a member of the regular army but his uniform allowed him to blend in with the real cavalry. This incident was one of several involving Lang and the New Guard during that year.
A similar ribbon-cutting ceremony on the bridge’s northern side by North Sydney’s mayor, Alderman Primrose, was carried out without incident. It was later discovered that Primrose was also a New Guard member but his role in and knowledge of the de Groot incident, if any, are unclear. The pair of golden scissors used in the ribbon cutting ceremonies on both sides of the bridge was also used to cut the ribbon at the dedication of the Bayonne Bridge, which had opened in Bayonne, New Jersey, close to New York City, the year before.
Despite the bridge opening in the midst of the Great Depression, opening celebrations were organised by the Citizens of Sydney Organising Committee, an influential body of prominent men and politicians that formed in 1931 under the chairmanship of the Lord Mayor to oversee the festivities. The celebrations included an array of decorated floats a procession of passenger ships sailing below the bridge, and a Venetian Carnival. A message from a primary school in Tottenham, 515 km (320 mi) away in rural New South Wales, arrived at the bridge on the day and was presented at the opening ceremony. It had been carried all the way from Tottenham to the bridge by relays of school children, with the final relay being run by two children from the nearby Fort Street Boys’ and Girls’ schools. The City of Sydney organising Committee also announced plans for a Great Eisteddfod. Lord Mayor Samuel Walder told the press that the competition would begin at the Town Hall in August 1933 and thus began the Sydney Eisteddfod.
After the official ceremonies, the public was allowed to walk across the bridge on the deck, something that would not be repeated until the 50th anniversary celebrations. Estimates suggest that between 300,000 and one million people took part in the opening festivities, a phenomenal number given that the entire population of Sydney at the time was only a little over a million people.
There had also been numerous preparatory arrangements. On 14 March 1932, three postage stamps were issued to commemorate the imminent opening of the bridge. Several songs were composed for the occasion. The bridge itself was regarded as a triumph over Depression times, earning the nickname “the Iron Lung”, as it kept many Depression-era workers employed.

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