Submissions open for Silverstream Pipeline Bridge

Published on 08 November 2021

Concept of the pipeline bridge in Silverstream

Greater Wellington Regional Council (GWRC) has publicly notified an application for a new Silverstream pipeline bridge project (south of the Silverstream road bridge) and submissions are open now.


The Silverstream Pipeline Replacement project proposes to replace an existing section of the ‘Te Mārua to Karori’ pipeline (known as the Kaitoke Main) at Silverstream which, under normal conditions, supplies 100% of Porirua City’s and 40% of Wellington City’s potable water supply.

In 2015, the section of the Kaitoke Main, that crosses Te Awa Kairangi/Hutt River via the Silverstream road bridge on Fergusson Drive was identified as significantly corroded. In addition, the pipe crosses the Wellington Fault, and damage as a result of an earthquake would likely interrupt the water supply to Porirua and Wellington City for a significant period of time.

The project proposes to relocate the section of water pipe that is attached to the Silverstream road bridge and along State Highway 2 (SH 2) by constructing a purpose-built bridge over Te Awa Kairangi/Hutt River, and a new section of underground pipeline in Manor Park Golf Course to improve resilience in earthquake and flood events. The bridge will be dual-use; able to carry a new water pipe and additional smaller three waters infrastructure in future, and will also provide access for pedestrians and cyclists between Silverstream and Manor Park.

To find out more and to have your say, go to