Western Ring Route: Waterview Connection


CLIENTS: New Zealand Transport Agency

DATE: 2009-2010


The completion of the Western Ring Route motorway project will involve upgrading the existing State Highway 16 (SH16) corridors and extending State Highway 20 (SH20) from Mt. Roskill to SH16 (Waterview Connection). The project was lodged with the Environmental Protection Authority (EPA) as a Road of National Significance.


Bioresearches was commissioned to provide ecological impact assessments, management plans and specialist advice as part of an NZTA technical review team. These assessments included marine, freshwater and terrestrial components including vegetation, reptiles and birds.


Detailed and comprehensive field assessments were completed along SH16 between the Great North Road Interchange and Westgate.


Several botanical features were identified that required specific mitigation and conservation. Monitoring and assessments of the stream ecology of waterways traversed by the route were carried out. 


The marine ecology of the Marine Reserve and estuarine creeks traversed by the route was assessed which included maritime vegetation, marine invertebrates and shellfish, sediment grain size and sediment chemical quality. A detailed assessment of coastal birds in the affected area of Marine Reserve Avifauna was carried out for the consideration of terrestrial and wetland birds (e.g. fernbird, banded rail).


Assessment of skinks at various locations was done using active searches and artificial refuges – passive sampling devices. Reports were produced and recommendations were made regarding mitigation for vegetation, pest control, copper skinks and bird roosting.


Evidence was prepared and presented at the Board of Inquiry for the Waterview Connection regarding avifauna. Evidence was also prepared and presented at the Consent Hearings for SH16 (Te Atatu to Westgate) regarding all ecological aspects.


We worked with:

Auckland Regional Council



Boffa Miskell

Chapman Tripp

Clough & Associates

Environmental Protection Authority

Green Group

Stephen Brown Environments Ltd.

Tonkin and Taylor Pty.