Culvert Fish Baffles

Culvert baffles are designed to assist with upstream fish passage by altering the flow of water through culverts and providing areas for fish to rest.

The baffles can be fitted prior to the installation of the culvert, or retro-fitted to existing structures. ATS Environmental provide an installation service if required.


Culvert Baffles placed inside culvert pipe are able to:

Reduce velocity
Increase depth
Interrupt laminar flow
Extend range of flow characteristics
Retain stream bed material
Create high and low flow passage


ATS Environmental culvert baffles are made in NZ from rotor-moulded flexible plastic (20+ year warranty). Our culvert baffles are suitable for round or square culverts and can be modified on site to fit any size requirements.

Blue culvert baffle installed

Blue culvert baffle installed


Culverts can be installed so that baffles are not required. Guidelines can be downloaded from a number of council websites.