NZ InfraWatch
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Waitematā Harbour Connections — Additional Crossing
Waka Kotahi NZ Transport Agency / Auckland Transport · Auckland
A second harbour crossing connecting Auckland's CBD to the North Shore, addressing chronic congestion on the Auckland Harbour Bridge (opened 1959, carrying 170,000+ vehicles/day). National's RoNS programme proposes a road-only tunnel (~$17B). Labour and Greens advocate for a multimodal crossing including heavy rail (~$25–35B). The Northern Pathway cycling/walking crossing was cancelled in 2024. This is Auckland's most contested and consequential infrastructure decision — arguably in the history of the city.
Key facts
- Region
- Auckland
- Sector
- Transport
- Status
- Planning
- Estimated value
- $17b
- Indicative completion
- 2040
- Funding status
- No Source
- Lead organisation
- Waka Kotahi NZ Transport Agency / Auckland Transport
- Election risk
- Extreme
Election risk assessment
National wants a road-only tunnel under the Waitematā Harbour. Labour and Greens want a multimodal crossing including rail. The two approaches differ by $8–18B in cost, a decade in timeline, and fundamentally in transport mode. No consent, no committed funding.
Government priority alignment
HIGH — Road-only tunnel option chosen — aligns with the GPS roads priority (though unfunded).
Chronology
- 1959Auckland Harbour Bridge opens — originally 4 lanes, expanded to 8 in 1969 with 'Nippon clip-ons'
- 2001First formal studies into a second harbour crossing commissioned by Transfund NZ
- 2009Auckland Regional Transport Authority study: preferred option is a road-rail tunnel combination
- 2016ATAP recommends additional harbour crossing by 2035–2040 as part of Auckland's long-term transport strategy
- 2018Waitematā Harbour Connections programme study begins — examining road, rail, and combined crossing options
- 2020Northern Pathway (cycling/walking bridge attachment) approved as interim active mode crossing. Construction begins
- 2021Waka Kotahi recommends multimodal road-rail tunnel as preferred option for the additional crossing
- 2023National wins election. Road-only RoNS tunnel approach signalled
- 2024National announces road-only tunnel as RoNS priority. Northern Pathway cancelled August 2024. Harbour Connections business case reset to road-only scope
- 2025Business case development underway for road tunnel. No consents, no committed funding. Cost estimate ~$17B
- 2040Earliest realistic target for road tunnel completion — subject to funding, consent, and sustained government commitment