The Poynder Ave replacement began with the temporary diversion of existing utility services and overhead powerlines that ran through the existing bridge, ensuring work could be safely undertaken. Due to the work being located within the stream, the team maintained a steadfast focus on keeping the live stream separate from the work area to protect the stream environment. They installed a line of sheet piles tied into the bank parallel with each abutment to isolate the work area from the stream. To minimize construction debris entering the waterway during the dismantling of the existing timber structure, the team established a temporary debris catchment under the bridge deck which successfully caught falling debris. After removing the existing concrete abutments and preparing the area, the team drove 6 steel piles into the ground along each abutment to a depth of approximately 10m below ground level, utilizing both mobile and telescopic crawler cranes mounted with pile driving hammers.

While site works progressed, separate teams worked efficiently offsite, constructing the precast wing walls and pre-stressed deck panels. The abutments were successfully constructed using a combination of precast panels and insitu concrete, which tied the piles into the abutments, expedited site works, and formed a solid platform for the new deck panels. Following the completion of the abutments and rock scour protection, the team removed the sheet piles and installed the prestressed decking units.

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The finishing works encompassed shaping and completing rock armouring along the riverbank, comprehensive landscaping, installation of kerbs, and full footpath and road reinstatement. Upon completion of the Poynder Ave bridge and its reopening to traffic, the team seamlessly transitioned to the Garden Road bridge replacement, employing the same proven methodology. Both bridges now stand as testament to Hunter Civil's commitment to infrastructure improvement while maintaining environmental protection and minimizing community disruption throughout the construction process.

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The dual bridge replacement project demonstrated effective project sequencing, robust environmental protection measures, and skilled engineering execution. The completion of both bridges has significantly improved the infrastructure of the Merivale area while maintaining the integrity of the Wairarapa Stream environment.

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