Abseil Access has successfully completed the construction of a 68-metre swing bridge in one of the most remote and logistically challenging environments our team has ever faced. The project, part of the St James Cycleway, required ingenuity, endurance, and precision engineering to overcome extreme conditions and complex site access.
Abseil Access Delivers Remote Swing Bridge in Harsh Winter Conditions
Challenging Logistics in the Backcountry
Getting people, equipment, and materials to site was no small task. The team used a combination of 4WD hiabs, utes, helicopters, and even mountain bikes to transport what was needed. Once on site, the crew lived in tents for up to 10 days at a time, with a nearby backcountry hut serving as a shared kitchen and living space.
Extreme Weather and Unexpected Timing
Due to circumstances beyond our control, construction took place during winter. The team worked through rainstorms, snow, and overnight temperatures dropping to -6°C, while contending with relentless sandflies during daylight hours. Despite these conditions, the crew pushed through to deliver the bridge on schedule.
Engineering Excellence
The swing bridge is anchored by two 2.4-metre-deep Deadman anchors and four 3.0-metre rock anchors, which secure the bridge against high winds using a catenary cable system. These anchors were drilled into greywacke using a bespoke drill rig, designed, developed, and built in the Abseil Access Christchurch yard.
Due to a significant elevation change from one side of the river to the other, a large platform and approach ramp were constructed to ensure the bridge was accessible to cyclists.
Team Effort
The project team included Dean Arthur, Jack Ryan, and Alex Arthur. A special mention goes to John McDonald, who initially visited the site to collect a Trademe purchase but stayed on to help build the ramp.
Building on History
The new bridge joins a legacy of four previous crossings over the Waiau Uwha River. While the exact livestock load capacity remains unknown, the bridge is designed to meet the needs of the St James Cycleway for years to come.
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