Wetland Restoration

Beavers are skilled engineers, well known for their ability to construct dams to create ponds that offer refuge from predators and serve as pantries to store food. These dams can, however, cause flooding issues for people. A proven solution is to install a “beaver dam leveler”.

The pipe is designed to allow water to flow at a controlled rate, preventing water levels from rising too high behind the dam. This helps mitigate flooding of nearby roads, fields, or structures. The pipe is often designed with a protective cage at the intake end to prevent beavers from blocking it. The cage disguises the pipe and prevents debris from clogging it, ensuring continuous water flow. The key to successful installation is ensuring that no water trickle sounds can be heard by the beavers, which triggers them to rebuild the dam downstream.

By regulating water levels instead of completely removing the dam, a beaver dam leveler allows the beavers to remain in the area. This helps preserve the ecosystem benefits beavers bring, such as wetland creation and improved water quality.

It is important to note that beavers typically give birth to their kits in May or June and so beaver dam leveler installation should be avoided during these months.

ILM is a certified installer of beaver dam levelers by the Beaver Institute of North America. For more information on the Beaver Institute, please visit www.beaverinstitute.org.

Beaver dam leveler.

Beaver Dam Leveler Variations

While piped levelers are most common, there are many variations in design depending on habitat type. For instance, the leveler shown below was constructed between two wetlands where water moved between them via a shallow stream running over a berm. Since the water was not deep enough to accommodate a piped leveler, it was redirected under the streambed itself through an excavated conveyance filled with porous plastic crates. Local permitting requirements will determine if this approach is available in your area.

Low ground-pressure of amphibious excavator allows for work in wetlands.

Amphibious excavator digging out conveyance.

Porous crates allow for water movement.