Electric fence material can be used to shock beavers approaching culverts. One approach used a device that created a mild electric current between electrodes placed in the water when it was activated by movement on the water's surface. When this device was installed properly, it created an electric field in front of a culvert, discouraging beavers from entering the area.

Another approach incorporated a series of wire loops that dangled from a wire electrified with a fence energizer (figure 17). Any animal that touched these loops received a shock. Although these devices can deter beaver activity, they should be used with extreme caution. The combination of water and electricity could endanger people as well as wildlife. Moving one electrode out of the water could increase the potential hazard. Changing water levels may submerge wires that were intended to dangle above the water. Although these devices may be applied safely under certain conditions, the potential risks should be considered thoroughly before they are used.

Figure 17—The Beaverhead-Deerlodge National Forest
has used electric fences to frighten beaver.

Forest Service Experience

Several respondents said they had used electric fences or hot wires near culvert openings successfully, although one respondent was concerned the device could shock someone. Another problem for that respondent was vandalism of the charger.

Bob Duhame, who works for the Beaverhead-Deerlodge National Forest used the dangling electrode technique successfully. First, he strings a strand of electric fence wire across the channel about 18 inches above the water's surface in front of the culvert or bridge. Then he uses alligator clips to attach strands of wire with loops at one end. These loops are placed 2 to 3 inches apart and 2 inches above the water. The installation is left in place for about 7 to 10 days. The cost of such an installation is about $320. It can be reused indefinitely.