Where necessary, forestry, agricultural land and gardens can be fenced effectively against beaver, which are poor climbers.
Wire fences can also be set across the water course on smaller rivers and streams, extending 100m either side, to prevent beaver passage and limit extension of territory.
Stock-proof fencing is adequate. Mesh size can be large, 15x15cm, and height low (around 1metre), permitting passage of most other mammals and fish.
Electrified wires can be incorporated or used separately – eg alongside waterside crops. Fencing for one week protects for up to three months following removal.
Given that beavers burrow for other purposes, an apron of netting laid on the surface or dug under is advisable, especially in soft ground.
Exclusion fencing at culverts
Beavers can occasionally cause localized flooding of roads and adjacent land by block culverts.
In many cases, this can be prevented by staking a strong woven wire fence – often trapezoid-shaped and known as ‘beaver deceivers’, 3 to 5 metres in front of the culvert, which physically prevents the beavers from accessing and plugging the culvert.
Should beaver build a new dam against the fence, the culvert remains open and continues draining water that spills through.
Factors such as water depth, topography and wetland substrate need to be assessed before placing a fence in front of a culvert.