The iconic Mount Henry Bridge, constructed by Clough between 1979 and 1982, has been officially recognised for its significance to Western Australia’s engineering and infrastructure history through its inclusion on the State Heritage Register.

Spanning the Canning River between Salter Point and Brentwood, the Mount Henry Bridge was a landmark achievement in Australian bridge engineering at the time of its construction. 

At 660 metres long and 29 metres wide, it was then the longest road bridge in Western Australia and remains one of Perth’s most recognisable transport links today.

Delivered for Main Roads Western Australia, the bridge featured innovative engineering and construction methods that pushed the boundaries of what was possible in large-scale infrastructure delivery. 

Its nine spans incorporated 258 box-shaped double-cell precast concrete units weighing up to 110 tonnes each, significantly larger than those used on previous major bridge projects in the state.

Clough collaborated with international specialists BBR and Cepas Plan AG to deliver the pioneering structure, which included a cable-stayed falsework system, full-span steel truss and massive steel tower used to support and place the precast units during construction. 

The project’s innovative approach earned the 1981 Award for Engineering Excellence from the WA Division of the Institution of Engineers.

The bridge was also notable for its forward-thinking design, incorporating pedestrian walkways and cycleways cantilevered from the lower flanges of the superstructure, features that continue to support Perth’s growing active transport network today.

The heritage listing recognises not only the bridge’s engineering significance, but also its enduring contribution to Perth’s transport infrastructure and community connectivity.

In a media statement, Western Australia Heritage Minister, Hon. Simone McGurk, said: "Spanning the Canning River and providing a vital north-south link, the Mount Henry Bridge has been recognised on the State Register of Heritage Places for its aesthetic, social, and scientific value.

"Its unobtrusive design and seamless adaptation to incorporate the Mandurah rail line drew on innovative construction and engineering techniques not seen before in Western Australia, earning the structure multiple awards.

"As part of the Kwinana Freeway, the bridge is also a key gateway to major tourist destinations in the southwest."

As part of the Webuild Group, Clough continues to build on this legacy by delivering complex and iconic infrastructure projects across Australia and the Asia Pacific.

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