Auckland’s $NZ 1.4billion Waterview Connection was the largest and most ambitious motorway project ever undertaken in New Zealand.

Tonkin + Taylor was a Non-Owner Participant (NOP) of the Well Connected Alliance (WCA) that delivered the project.  

The Waterview Connection involved the construction of twin tunnels using the largest tunnel boring machine in the Southern Hemisphere, 5km of multi-lane motorway, four major motorway interchange viaducts, motorway bridges and multiple retention structures. 

The project is located in the centre of suburban Auckland, with the tunnel alignment passing under rail links and commercial and residential buildings.  

T+T provided a range of consulting services – the most significant being design expertise across key aspects of the project – including engineering geology, geotechnical, civil, hydrology, stormwater, design management, ecology, environmental management, and construction observation. Pou whenua were erected at the entrance to the bridge and carved by local Māori artists, representing Ngāti Whātua Ōrākei.


  • Being a Non-Owner Participant (NOP) 
  • Design management for the delivery of all civil and geotechnical components 
  • Civil engineering design, including roadworks, utilities, motorway network drainage and stormwater treatment design 
  • Geotechnical interpretation of ground conditions along the entire project route 
  • Geotechnical design for retention works, earthworks, tunnelling, bridge and building foundations, slope stabilisation and instrumentation and monitoring works 
  • Hydrological modelling and stream works design 
  • Structural design lead for the major retention works 
  • Monitoring and mitigation of tunnelling effects 
  • Construction phase support and quality assurance for above-ground and tunnelling works  
  • Planning and Ecology expertise to manage and protect flora and fauna 
  • Assisted in finalising the position of the tunnel ventilation discharge  
  • Ground contamination assessment and management 
  • Erosion and sediment control design and construction support 
  • IT infrastructure design, setup and ongoing technical and helpdesk support


  • 2019 ACENZ Gold


  • Waka Kotahi New Zealand Transport Agency


  • 2011-2017

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