North Harbour 2 watermain project

Project overview

North Harbour 2 (NH2) is a 33km watermain that will service a population increase of 200,000 people in west and north Auckland. NH2 will provide treated water to cater for growth but also provide resilience by duplicating the existing North Harbour 1 (NH1), including a critical section at the Greenhithe Bridge crossing. NH2 will service peak demands along the network, especially in the upper north shore.

Please refer to the map below showing our proposed alignment for NH2.

Early works for NH2 on Greenhithe Bridge

While our main construction works for the NH2 project are still a while away, our contractor will commence early works under Greenhithe Bridge as part of the NH2 project from mid-September 2025. These works involve structural support works in preparation for when we lay the new watermain under Greenhithe Bridge.

While we carry out these works, there will be some temporary impacts on the cycleway.

Our contractor will need to access our site compound (as shown on the map below). This will involve vehicles accessing the cycle way from Tauhinu Road, Greenhithe and driving down to the site compound for approximately 10-15 minutes during the morning and afternoon.

A high-level overview of these works is shown below.

From mid-September to April 2026

There will be short term interruption to the cycleway during the morning and afternoon periods while vehicles access and leave the site. These temporary closures are not expected to be longer than five minutes at a time.

Working hours will be from Monday to Friday 7.30am-4.30pm. Work on Saturday will only be utilised if required.

Impacts to the cycle way will only occur from 7.00am-7.30am and 4.00pm-4.30pm.

Note: There will be no works from 18 December 2025 to 12 January 2026. There will be no works and no impact on the cycleway during this period.

From November 2025 to April 2026

Night works may take place periodically between 9.00pm and 5.00am. During this period, the cycleway on the bridge will be interrupted by a stop/go operation. This will allow continued flow for pedestrians and cyclists while works are carried out.