The Grafton bridge, which spans Grafton gully in Auckland, was opened in 1910. It was then the largest reinforced concrete arch in the world. Building the concrete arch was a huge undertaking, using 943 cubic metres of West Australian jarrah and Oregon pine. The work took over two years, and cost £35,000 (nearly $6 million in 2018 terms). The bridge span is 97.6 metres.
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Permission of the Alexander Turnbull Library, National Library of New Zealand, Te Puna Mātauranga o Aotearoa, must be obtained before any re-use of this image.