The world's highest suspension bridge has been constructed across a 500 m deep canyon in karst at a remote location in Papua New Guinea to carry oil pipelines across the Hegigio River. The bridge has a main suspension cable and two wind cables, each cable requiring anchorage into cavernous limestone. For the south abutment located on a pre-existing cut and fill bench, an A-frame tower was erected on pad footings, but with the most critical issues surrounding an 11 storey temporary erection tower at the cliff edge. On the higher north abutment, the main cable required only a simple support structure, but the wind cable anchorages had to be constructed from a bench cut into the cliff face. Site investigation and work was particularly challenging, not only for the usual issues of karst but also because of the remote location and extreme topography, and for the control of risk during construction.

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