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Berms & Water Retention Ponds


Berm or Storm Water Retention Pond 

Call CWC to address beaver damage to berms and water retention ponds.



State Land & Water departments along with other pollution control agencies seem to agree that the greatest source of water pollution is storm water runoff.

Retention ponds are created to act as a basin to collect this water runoff and allow the sediments to settle or be reabsorbed by the plants and the environment.

Earth berms are created on lakes and ponds to create a barrier between the water retention pond and the native body of water or marsh.

Beaver undermine these structures because they present a barrier between the beaver and their food source which is the trees and bushes on the bank opposite the berm.

Beaver may begin by crossing over the berm in the same location creating a crossover as seen in the picture above.

Eventually the beaver will dig a canal straight through the berm itself. This allows the beaver to reach their food source without leaving the water which leaves them less vulnerable to predators.

Most long established berms that have a beaver population in the area will have a tunnel dug by the beaver going completely under the lake bed leading from one side of the berm to the other.

The end result is a compromised barrier allowing polluted water to flow into the native lakes, ponds, streams and marshes they were meant to protect.

Do not repair a compromised berm or water retention pond without first implementing a professional beaver control program.

Fact: Beaver can and do dig and tunnel through earthen berms under the ice during the winter season.


Additional Information

Winter Activity of Beaver