How To: Install a Permanent Culvert

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Culverts are the most commonly used form of stream crossing. The following tips will enable you to construct a well-functioning and stable culvert.

  • Provide a suitable bed for the culvert composed of compactable material.
  • Compact fill around and over the culvert in 1-foot lifts.
  • The fill above the culvert must be 12 inches of 0.5 times the diameter of the culvert, whichever is greater. For example, a 20-inch culvert must have 12 inches of fill above the pipe, while a 40-inch culvert will need 20 inches of fill above the pipe.
  • Apply armoring or vegetation around culverts to prevent erosion, as needed.

For more information about culvert installations, see: