Key Takeaways
- The Bryham sisters say a rare kahikatea swamp forest on their family farm – where their father’s ashes are scattered – could be cleared for a new four‑lane highway linking Auckland and Whangārei.
- The forest contains centuries‑old kahikatea and pūriri trees, supports native birds, long‑tailed bats and Hochstetter’s frogs, and has been carefully maintained by the family for decades.
- Up to 90 % of the sisters’ land may be required, potentially forcing the relocation or demolition of five family homes and disrupting orchards, gardens and a 90‑year‑old mother’s residence.
- The sisters have invested roughly NZ $120,000 over five years restoring the Ahuroa River banks and protecting the wetland, underscoring their stewardship.
- NZTA’s Northland Corridor project is still in the planning phase; land acquisition would likely occur about two years before construction, though the exact footprint for the Waipū section has not been finalised.
- Environmental group Forest and Bird warns the chosen route over the Brynderwyn Hills threatens critically endangered species and advocates a return to an earlier western alignment that would bypass the hills.
- While NZTA says impacts on wildlife will be mitigated and the project will use a fast‑track consenting pathway, independent expert panels will oversee environmental safeguards.
Family’s Emotional Connection to the Wetland Forest
Heather Jean and Linda Bryham describe the kahikatea swamp forest on their property as more than just trees; it is a living memorial where their father’s ashes were scattered after his death at age 48. The sisters, now in their 60s, say the forest has been a constant presence throughout their lives, providing shade, birdlife and a sense of place that ties them to three generations of farming on the Brynderwyn Hills. Losing it would feel like erasing a tangible link to their parent and to the land their parents worked since the 1960s.
Ecological Significance of the Kahikatea Stand
The forest comprises two towering stands of kahikatea stands that also contain some up to six metres, fenced‑off kahikatea blocks that have been kept free of livestock and weeds for up to 60 years. Within these stands are ancient pūriri trees with trunks up to six metres in girth, creating a complex understorey that shelters native fauna. The sisters note the intermittent wetland supports abundant bird life, long‑tailed bats and Hochstetter’s frogs—species that rely on the unique combination of swamp forest and riparian habitat. Ecologists consider such lowland kahikatea swamp forests rare, making the site a valuable refuge for biodiversity.
Potential Land Loss and Displacement of Family Homes
NZTA has indicated that up to 90 percent of the Bryham property could be required for the proposed four‑lane Northland Corridor, leaving only two small, flood‑prone parcels—one reachable only by kayak. This would likely necessitate moving or demolishing five homes owned by family members, uprooting orchards, vegetable gardens and infrastructure the sisters have cultivated over decades. Their mother, now in her 90s, still resides on the farm, and the sisters express deep reluctance to relocate her, fearing the upheaval would compromise her wellbeing and the family’s way of life.
Generational Stewardship and Financial Investment
Beyond emotional ties, the Bryhams have actively managed the wetland for years. Over the past five years they have spent approximately NZ $120,000 planting native vegetation along the banks of the Ahuroa River, which runs through their property, to improve water quality and habitat resilience. This investment reflects a long‑term commitment to ecological health that contrasts sharply with the prospect of the forest being cleared for infrastructure. The sisters argue that their stewardship demonstrates the land’s value beyond mere real‑estate considerations.
Overview of the Northland Corridor Project
The Northland Corridor is a Roads of National Significance initiative split into three sections: Warkworth‑Te Hana, Te Hana‑Port Marsden Highway (over the Brynderwyn Hills), and Port Marsden Highway‑Whangārei. The middle section, which traverses the Brynderwyn Hills and passes near Waipū, is still under route evaluation; no final designation has been made for the segment that would affect the Bryham forest. NZTA says the Warkworth‑Te Hana leg is already in contract negotiations, while the Brynderwyn section awaits further analysis before land requirements are confirmed.
Current Status of Land Acquisition and Timeline
According to an NZTA spokesperson, the agency typically seeks to acquire land roughly two years before construction begins, meaning any purchase for the Waipū area would still be several years off if the project proceeds. At present, NZTA states there is “no confirmed requirement for property” and it is not actively purchasing land, allowing the Bryhams to continue using their farm as usual. Once the land need is finalised, funding and construction timelines are known, the agency will move to acquire the necessary parcels closer to the start of work.
Environmental Opposition from Forest and Bird
Forest and Bird’s Northland conservation manager, Dean Baigent‑Mercer, has criticised the chosen alignment over the Brynderwyn Hills, arguing it offers little advantage over the existing State Highway 1 route, which sits on geologically unstable substrate prone to slips. He stresses that the corridor would cut through ancient forest that provides habitat for critically threatened long‑tailed bats and Hochstetter’s frogs—species already impacted by recent road works. Baigent‑Mercer urges a return to the earlier western alternative that would route the new highway around the hills, thereby avoiding direct impacts on the wetland forest and its dependent wildlife.
Rationale Behind the Selected Route and Cost Considerations
NZTA maintains that after re‑evaluating options in light of the new Government Policy Statement on Land Transport and the severe weather events of 2023‑2024 (including Cyclone Gabrielle), the preferred alignment is now close to the existing highway because it offers a more direct path with predictable geology. Early cost modelling suggested a far‑western route would be substantially more expensive due to greater length, increased earthworks, complex consenting and challenging terrain. The agency also notes that habitats for Hochstetter’s frogs and bitterns at Doctor’s Hill have been examined, and any adverse effects would be mitigated as part of the project’s environmental management plan.
Mitigation Measures and Fast‑Track Approvals Process
The Northland Corridor is listed in Schedule 2 of the Fast Track Approvals Act, which enables a streamlined consenting pathway while still requiring independent expert panels to verify that robust environmental safeguards are in place. NZTA says impacts on native species and their habitats will be mitigated, though specifics of mitigation (such as habitat offsets, fauna relocation or planting programmes) have not yet been detailed. The agency plans to issue notices of requirement for land along the corridor later this year, after which the formal acquisition process would begin, subject to funding and construction schedules.
Looking Ahead: Uncertainty and Hope for a Compromise
For the Bryham sisters, the prospect of losing their father’s memorial forest and the farm that has sustained their family for three generations is deeply distressing. They acknowledge the need for a safer, more reliable link between Auckland and Northland but question why the existing flat‑land corridor farther north cannot simply be widened instead of invading a precious wetland. As the project moves through planning, the sisters, local iwi, environmental groups and NZTA will continue to negotiate the balance between infrastructure development and the preservation of a unique ecological and cultural landscape. The outcome will hinge on whether alternative routes can be refined to reduce environmental impact while still meeting the region’s transport needs.