Makatote Viaduct
ONTRACK

Built in 1908, Makatote Viaduct is New Zealand’s third highest railway viaduct. The 80-metre-high structure was threatened by land instability and erosion around the footing of one of the central piers. As a critical component on the North Island main trunk line, it was imperative that the viaduct remained open at all times in order to prevent excessive disruption to rail traffic.

The $4.2-million solution was an innovative plan to underpin the vulnerable foundations by building two piles beside the existing concrete footing and installing a 38-metre post-tensioned concrete cross beam.

The project team faced demanding constraints as the site was located within a National Park. Another critical consideration was the possibility that construction activities could destabilise the viaduct whilst normal rail traffic continued to use it, which imposed significant logistical constraints. Difficult site access, tight environmental requirements and at times atrocious weather added to the project’s challenges.

The Makatote Viaduct project is a worthy winner in this category.

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