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Library Card

Nolte, Dale L; Arner, Dale H.; Paulson, John ; Jones, Dr. Jeanne C.; Trent, Andy . 2005. How To Keep Beavers from Plugging Culverts. 0577 2830P. Missoula, MT: U.S. Department of Agriculture, Forest Service, Missoula Technology and Development Center. 30 p.

Describes ways to address the problems caused by beavers that dam culverts. This problem has become more serious as beaver populations have recovered from unregulated trapping during the 19th century. The rapid flow of water through culverts and noise of running water trigger beavers' instincts to build a dam. If the speed of flow and the noise of running water can be reduced, beavers may leave culverts alone. Often, the best solution is to replace the culvert Cardwith one that is oversized or to move it to a more suitable location. Either choice is expensive. When existing culverts can't be replaced or relocated, options include:

  • Installing devices that keep beavers from damming culverts
  • Installing waterflow devices that control the speed and noise of the water
  • Using devices to frighten the beavers (short-term solution)
  • Trapping or shooting the beavers (they could be replaced by others living nearby)
  • Fencing the area to keep beavers out

Keywords: animal damage control, dams, fencing, flooding, repellants, Wildlife Services

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