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Auckland Transport

Wolverton culverts upgrade Wolverton culverts upgrade

Auckland Transport (AT) is upgrading two culverts under Wolverton Street in Avondale.

Project status: Design
Project zone: West

Project overview

In February 2020, Auckland Transport will begin a programme to replace two culverts under Wolverton Street. Both culverts are coming to the end of their design life and need to be replaced. Once installed, the new larger culverts can contend with greater amounts of rainfall and more frequent storm events, reducing the risk of flooding in the area.

The culverts allow the Whau and Waitahurangi streams to flow under Wolverton Street. The Whau Stream culvert (Culvert 1) is located near the ambulance station, and the Waitahurangi Stream culvert (Culvert 2) is near the Gull station and Olympic Park.

Wolverton culverts upgrade
Caption: (left) Culvert 1: Whau stream, (right) Culvert 2: Waitahurangi stream.


  • Reduced risk of flooding in the area.
  • Enhanced attractiveness of the area.


  • November 2018 – Investigation and design.
  • December 2018 – Site clearing and investigation.
  • Late-2019 – Preparatory works.
  • February 2020 – The start of on-road works and tidal flow traffic management system.

Project details

Preparatory Works

Further preparatory work will be ongoing from October 2019. Some of the work will focus on protecting all of the services and utilities that are located under the road, such as gas and water pipes. Contractors will complete further investigative works on these important service lines using CCTV and pot holing to locate all services accurately. This information will assist with the construction of the new culverts.

Once the utilities have been assessed, engineers will determine the best method to protect the utilities when the culverts are being replaced.

Further works to assess the condition of the triple pipe culvert on the Waitahurangi stream will be undertaken by de-watering the culverts to allow the contractors and specialist consultants to view this structure. The purpose of this work is to understand the condition of this culvert to protect its functioning through the construction period. We will work with ecologists to protect the aquatic life and maintain passage for fish during the de-watering activities.

Our contractors will work with specialist consultants to minimise any downstream effects during these works.

We anticipate that construction to replace the culverts will start in February 2020. We will provide more information on this page when we have a more detailed timeline.

For more information on this project

Contact Auckland Transport