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State highways have the potential to cross waterways, meaning the correct design and installation of culverts is essential for the purpose of fish passage. This guide has been designed to assist in the best practice design and retrofit of NZ Transport Agency culverts for effective fish passage to meet our statutory obligations.

Note that this guidance is currently out of date. We are in the process of updating it, along with a new policy and specification. In the meantime, refer to and follow:

• New Zealand fish passage guidelines for structures up to 4 metres(external link)
• National environmental standards for freshwater(external link)
• National policy statement for freshwater management 2020(external link)
• Freshwater Fisheries Regulations 1983(external link)