Common Types of Wildlife Crossing Structure Types

Common Types of Wildlife Crossing Structures

Category	Definition	Shape	Typical Material

Wildlife crosses UNDER the traffic.
Wildlife Under pass: Culvert	Animals pass under an intersecting roadway through a culvert. A culvert is a conduit covered with embankment around the entire perimeter. It may or may not convey water. Small conduits for amphibians are sometimes called tunnels.
Box Culvert	Culvert has four sides, including bottom. Sometimes square or rectangular corrugated metal pipe culverts without bottoms are called box culverts, but in this toolkit they are referred to as bottomless culverts. Box culverts may be arranged in a horizontal series of small culverts to form multiple chambers.	Precast concrete Cast-in-place concrete Wood
Culvert (Continuous)	Culvert is continuous in circumference. The lower portion may or may not be buried. Sometimes simply called pipe. European badger culverts are sometimes called ecopipes. Slotted drain culverts are continuous except for a break in the upper portion.	Corrugated metal pipe Metal plate Cast-in-place concrete Precast concrete Wood
Bottomless Culvert	Culvert is discontinuous in circumference with rounded or square top and natural surface bottom. Also called open-bottom culvert.	Corrugated metal pipe Metal plate Precast concrete Cast-in-place concrete Wood

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