Redoubt Road reservoir expansion project

Construction of an additional water storage reservoir at the existing Redoubt reservoir complex.
First stage of the project
Start-finish: October 2021 - 2024
Location: Redoubt Road and Mill Road, Manukau
Status: Construction

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The project

Tamaki Makaurau is predicted to grow by 700,00 to 1 million people over the next thirty years, and with it the demand for water will increase. While we are actively working on bringing on water sources to make Auckland’s water supply more resilient, we also need to increase our treated water storage capacity. The Redoubt Road reservoir site currently has two large reservoirs holding 120 million litres. The addition of a third reservoir, able to hold 45 million litres, will help future-proof Auckland’s water supply and cater for the region’s growth. The expansion project currently involves the construction and connection of a new reservoir and the establishment of an access road off Mill Road. The project will be completed in two stages:
  • Stage One - Oct 2021-mid 2022: Earthworks to establish an additional access road off Mill Road, Manukau (see red line on map below)

  • Stage Two - mid 2022-2024: Construction of additional water storage reservoir (green shaded box on the map below)

map of redoubt road reservoir expansion project

What is the latest



Ninety-nine per cent of the roof is now complete which means we’re edging closer to the structure cementing its role in helping future-proof Auckland’s water supply. Overnight on 25/26 October, the second to last roof concrete pour was completed. The last pour is scheduled for mid-November. The roof has a waterproof membrane mixed into it to help prolong its lifespan and avoid damage, rust, rot, corrosion and deterioration.


  • Two of the four connections for the new CLS pipe into the existing transmission network are due to be completed before the end of 2023. The remaining two connections will be completed in May 2024 during a period of low water demand.

  • Filling of the reservoir structure for testing is planned for early January 2024, although the delivery team is looking at ways to bring that forward and fill before Christmas to utilise the holiday period for watertightness testing.

Fourth concrete pour for the roof at Redoubt Road
Fourth concrete pour for the roof at Redoubt Road
Fourth concrete pour for the roof at Redoubt Road

Our progress banner

This is the first concrete pour to construct the floor of the third reservoir. Concrete structures like this are carbon intensive. Our team is offsetting carbon emissions by adding fly ash to the cement mix, and transporting clay fill from on-site to help construction works at Puketutu Island – that’s where we’re rehabilitating volcanic cones that were quarried in the 1950s.

Since things kicked off in November, our team and contractor have moved more than 200,000 tonnes of clay material. The majority of that has been redistributed to fill zones across the site, and 50,000 tonnes is being reused at Te Motu a Hiaroa / Puketutu. This reuse approach helps us reduce our carbon footprint while respecting our Te Ao Maori value of what is given by the land should be returned to the land / He taonga nō te whenua, me hoki anō ki te whenua.

What you're watching is the enabling works - the moving and shifting earthwork stage of the project. With more than 80 per cent of Auckland’s daily treated water supply passing through the site each day, this is an important part of the water infrastructure network.

The design walkthrough video lets you explore the site and shows the enabling earthworks being undertaken by our construction partner, Fulton Hogan.

How will the work affect you

  • Working hours will be between 7am to 6pm Monday to Friday, and 8am to 5pm on Saturdays.

  • You may notice an increase in truck movements, particularly on Mill Road.

  • Temporary traffic management will be in place around work areas for the safety of motorists, pedestrians, and construction staff while the new entrance off Mill Road is constructed. A reduced speed limit of 50km/hr on a 370m section of Mill Road will be in place for the duration of the project.

  • Public access to the site around the reservoirs is restricted to ensure the health and safety of the public, Watercare’s team and the contractors.

Any questions?

If you have any questions regarding this project, please contact us at [email protected]


Redoubt Road Reservoir project newsletter December 2022
Redoubt Road Reservoir project overview May 2022
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