Flexi Baffle – Culvert Baffles

Let’s Bring Fish Back Home with the Flexi Baffle® Culvert Baffle!

Flexi Baffle flexible culvert baffle or culvert weir used to improve fish passage.

The Flexi Baffle is a quick and inexpensive method to improve fish passage through culverts. Salmon, trout and other fish and aquatic species are often blocked from their habitat by poorly designed or constructed culverts.  Repairing or removing culverts is costly and requires considerable time and resources.  We have developed culvert baffles that improves fish passage in an effective and economic manner. 

The Flexi Baffle culvert baffle increases roughness in culverts to improve habitat connectivity for a variety of strong and weak swimming species in hundreds of installations all over the world.  ​ 

Educational Videos

The Benefits of the Flexi Baffle 

Flexi Baffle flexible culvert baffle or culvert weir used to improve fish passage.
Flexi-Baffle in a culvert demonstrating improved hydraulic conditions

Installing weirs or culvert baffles is often an option to mitigate poor passage conditions in culverts and other fish passage barriers.  However, a solid weir or baffle often adversely affects the hydraulic capacity of the culvert.  Solid structures can also be damaged during high flow events.  We have developed a flexible weir that can be adapted to a wide variety of culverts to reconnect fish and other aquatic organisms with their habitat.

Improve Habitat Connectivity

The Flexi-Baffle culvert baffle can improve passage for a variety of weak and strong swimming species.  Populations of fish and other aquatic organisms can become isolated by poor culvert passage conditions.  Anadromous species, such as salmon and lamprey can be excluded from spawning grounds.  Juvenile eels are often precluded from freshwater habitat by poor culvert passage conditions.  Reconnecting these habitats are the key to conserving these species. 

Maintain Hydraulic Capacity of the Culvert

The Flexi Baffle culvert baffle has a flexible design which allows them to bend over and pass flows during high water events.  After the flood event, the baffle returns to vertical thereby creating resting pools and slowing water velocity which provides improved passage conditions.  The Flexi Baffle can be customized to any length and height from 6 to 12 inches.  
Inexpensive and Simple to Install

The Flexi Baffle culvert baffle is installed with simple hand tools.  You don’t need expensive tools or a lot of expertise to install.  A team of two can improve fish passage in most typical culverts in just a few hours.  The Flexi Baffle can be installed in a variety of culvert shapes and sizes. 

We Can Assist with your Flexi-Baffle Application

Our Fish Passage experts can assist you with your specific culvert baffle application.  Each culvert is different.  We can help design the type and configuration of Flexi Baffles that will provide the most benefit for your site.   

Learn more from our Fish Passage Experts>>>


Flexi Baffle Installation Mill Brook, VT

The White River Partnership installed Flexi Baffles in a culvert on Mill Brook to improve fish passage for brook trout. The installation improved fish passage while maintaining the hydraulic capacity of the culvert.

Before and After Fish Weir Installation

Johnson Creek Fish Passage Restoration
Portland, OR

Prior to Culvert Remediation

Flexi Baffle flexible culvert baffle or culvert weir used to improve fish passage.

Improve Fish Passage with Culvert Baffles

Installing Fish Weirs in a Culvert to Improve Fish Passage

Fish Passing Culvert After Fish Weir Installation