Beaver Proof Culvert - Beaver Pipe and Fence by Beaver Solutions LLC
Culvert protective fences stop beaver flodding problems created by beaver dams. Shipped in the US. Installation in Southern New England. Beaver Solutions LLC
culvert protection fences, CulverClear, beaver problems, beaver dams, culvert protection, culvert protection devices, beavers, flooding, dams
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Get Beaver Proof Culverts Using Keystone Fences

Get Beaver Proof Culverts Using Keystone Fences from

Trapping Beavers from


To a beaver, a road bed with a culvert pipe probably looks like a hole in a large dam. Since beavers have an innate ability to plug leaking holes in their own dams, they are also very good at blocking water flowing through road culverts. By blocking a culvert beavers can easily create a large dam and pond. A blocked culvert can quickly flood road causing a public safety issue, and can be a significant drain on limited manpower and financial resources.

Fortunately, properly designed and constructed culvert protective devices have proven to be extremely effective in eliminating culvert damming by beavers. Our flow devices have a 98% success rate protecting culverts despite the presence of beavers (see Beaver Solutions Studies ). Different culvert flow device options include: Keystone Fences™, Fence and Pipe Devices, and Culvert Fences with Diversion Dams. They are so effective we can Guarantee them. Annual maintenance is usually less than one hour per year.

boys-club-road-3Keystone Fences™ – Culvert Protective Fences

Beaver Solutions LLC has installed hundreds of successful culvert protective fences. Our Keystone Culvert Fences are usually trapezoidal in shape and have a 96% success rate. They eliminate beaver culvert damming in several important ways.

First, the fence creates a long perimeter that the beavers must dam against. Typically over 40 feet, this long perimeter makes it much more work for the beaver to dam the culvert. This makes plugging the culvert less desirable, keeping it open to flow without obstruction.

Second, if beavers try to dam the culvert inlet, the Keystone Fence will force them to dam further and further from the culvert. This misdirection discourages damming on the fence.

Third, if the topography of the stream allows for water to surround the entire fence perimeter, the fence should be built in a trapezoidal (Keystone) shape. The trapezoidal shape discourages beaver damming because if the beavers start damming at the culvert as they get further away from the culvert inlet the opening that the stream is flowing into is widening. This widening of the water inlet reduces the water movement at the fence where the beaver is damming. Since the sound and feel of moving water are strong damming stimuli for beavers, their desire to continue damming is reduced.

Trapezoidal Culvert Protective Fence Diagram

Trapezoidal Keystone Fence Diagram

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Together we’ll devise a solution specific to your setting.

  • Site Assessment and the following Product Kit:

Six inch by six inch, 6 gauge concrete mesh fence is optimal. The openings are large enough to minimize floated debris buildup on the fence, yet small enough to prevent beavers from carrying damming materials inside. Fence flooring is often installed to prevent tunneling under the fence. Quality construction with the finest materials is imperative if the system is to withstand the test of time, the elements, and the beavers.

Maintenance on a well designed culvert protective fence is minimal and typically consists of three to four times a year removing sticks and leaves that floated against the fence. This usually takes less than 15 minutes per cleaning and can be done by anyone willing to get in the water. Beaver Solutions LLC offers this service at a low cost, and offers a Money-Back guarantee on every flow device we maintain.

Beaver-Control-Diversion-Dam-and-Beaver-Fence-Diversion Dam with a Small Culvert Fence

There are times when a stream channel at a road culvert is too narrow for a trapezoidal Keystone Fence™ but a beaver dam outside of the culvert would not pose a threat to the road. In situations such as these, building a small culvert fence with an upstream diversion dam may be the best way to protect the road.

The culvert protective fence is installed to keep the culvert open, and the diversion dam is started approximately ten feet upstream of the fence to encourage beaver damming away from the fence. Typically this is done by strategic placement of preexisting stones across the streambed to create some pooling and cascading water noise. This will stimulate the beavers to dam upon the diversion dam rather than the culvert fence. If in the future the size of the dam needs to limited, a Flexible Pond Leveler™ can be installed through the “diversion dam” and into the culvert fence.

Poorly designed culvert protective fences like this one by a railroad can actually make it easier for beavers to dam and cause flooding problems.


Effective flow devices are custom designed and constructed to account for the unique characteristics of each site. For the best outcomes a professional Site Assessment is important to determine if a flow device is appropriate and what type and design would best suit each site’s unique characteristics. Some variables that affect flow device design include: stream flow, culvert type and size, streambed topography, presence of other beaver dams, beaver food supply, the sound and movement of water in the culvert (important stimuli for beaver damming), the potential for other upstream or downstream flooding conflicts, and the previous use of poorly designed flow devices by others.

Following a site assessment is possible to select the type of flow device which will protect the culvert from beavers in the most cost-effective and long-term manner. Since nearly every culvert can be effectively protected for many years with properly design and installed flow device, the short term solution of trapping is rarely needed.

Types of Culvert Protection

  • Keystone Fence™
  • Fence and Pipe device
  • Diversion Dam and Culvert Fence

Our Flow Devices Are:

  • Low Maintenance
  • Very cost-effective
  • Maintenance Plans are available in NE
  • Money-Back Guaranteed

When protecting a culvert from beaver damming it is important to minimize any adverse effects on wildlife passage through the culvert.

While the primary goal must be to prevent beaver damming of the culvert to protect road safety and integrity, there are techniques available that can allow animals to use the culvert for passage.

Wildlife Passage Design Techniques

  • Flared fence opening to high ground
  • Unfenced double culvert
  • Diversion dam without a culvert fence
  • One-way door in fence
  • Ramp on fence