West Gate Bridge: what caused the collapse, and what followed?
At 11.50 am on 15 October 1970, a 112-metre span of Melbourne’s West Gate Bridge collapsed during construction. Thirty-five workers died and 18 others were seriously injured. Some of those killed had been taking their lunch break in huts beneath the structure. Others were working on or inside the span.
They had gone to work that morning. Their families expected them home.
The collapse became a turning point for workplace safety in Victoria. It also left questions that extend beyond bridge construction: how do organisations recognise danger, who has the authority to act, and what happens to people after the immediate emergency has passed?
What caused the bridge to fall?
During construction, two large steel sections that needed to be joined did not align. Their upward curves, known as camber, differed by approximately 11.4 centimetres.
Heavy concrete blocks were placed on the higher section to bring it into alignment. This loading, called kentledge, caused part of the steel structure to buckle. Bolts were subsequently removed from a joint in the upper steel plating in an attempt to straighten the buckle. The span collapsed.
But the Royal Commission warned against treating the removal of bolts as the complete explanation.
Its findings traced the failure back to inadequate structural design and insufficient checking of the proposed construction methods. The designers, Freeman Fox and Partners, had not provided adequate safety margins during construction; the Commission found that the margins would also have been inadequate in service had the original bridge been completed.
The unusual erection method proposed by the original contractor, World Services and Construction, required exceptional care. The Commission found that neither that contractor nor its successor, John Holland, adequately appreciated this requirement, and that the consultants had failed to prevent dangerous procedures.
The final action occurred within a much longer chain of decisions and failures.
What the Royal Commission established
The Royal Commission’s report was tabled in the Victorian Parliament on 3 August 1971. Its investigation examined responsibility across the project rather than stopping at the immediate trigger.
It described the disaster and the loss of 35 lives as “utterly unnecessary”. Its findings identified mistakes, miscalculations, failures of communication and errors of judgement among those responsible for delivering the bridge. Design and construction methods were reconsidered before work resumed in 1972.
This distinction remains useful when examining workplace harm. Understanding the last thing that happened is only part of understanding why it happened. An investigation also needs to examine the conditions, decisions and allocation of responsibility that allowed the danger to develop.
Did the disaster change workplace safety?
WorkSafe Victoria describes the collapse as a turning point for occupational health and safety in the state. That is a supported way to explain its significance.
Its legacy should nevertheless be understood within the wider history of safety reform. It would be too simple to draw a straight line from this one Royal Commission to all the legislation and workplace protections that followed.
For workplaces today, the practical question is how learning becomes action. A finding needs someone responsible for implementing it, resources to make the change and a way to check whether it is working. Workers need to be able to raise concerns and see those concerns addressed.
An inquiry can establish what went wrong. Preventing further harm requires sustained work after the report is delivered.
The aftermath includes psychological harm
Workplace disasters affect more than the people physically injured. Survivors, witnesses, rescuers and colleagues may also be exposed to traumatic events.
Safe Work Australia recognises witnessing or investigating a fatality or serious injury as a psychosocial hazard. Its guidance includes reducing unnecessary exposure and providing recovery time and support for affected workers.
This gives us a contemporary lens through which to consider the aftermath of West Gate. It does not tell us what any individual survivor experienced or establish a diagnosis.
It does remind us to ask about care alongside accountability. Who maintains contact with affected workers? How are families supported? Can people access help without having to repeatedly explain what happened? How does a workplace recognise that the consequences may continue long after operations resume?
Remembering the people
A memorial plaque funded by bridge workers was unveiled on 15 October 1978, naming the 35 men who died. The West Gate Memorial Park opened at the collapse site in 2004.
These memorials preserve something an engineering account cannot convey on its own: each person named had relationships, plans and a life beyond work.
In making Shattered, we spent time at workplace memorials around the country, learning about the people and events they commemorate. That experience deepened our understanding of how workplace harm reaches into families and communities.
West Gate brings us back to the question at the heart of the series: When work changes a life, what happens next?
The answer includes investigation and prevention. It also includes how we care for people living with injury, grief and loss—and whether the knowledge gained leads to a different response when the next warning appears.
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