Home » Sectors » Wildlife Crossings and Fish Passages

Wildlife Crossings and Fish Passages

AIL leads the pack in the design and supply of safe and effective wildlife crossings and fish passages.

With a successful project pedigree spanning over 50 years and a few continents, AIL is your go-to partner in all types of wildlife overpasses and underpasses. Our specialists have worked closely with some of the industry’s top authorities on wildlife behaviour and crossing design.

We are proud to have partnered with Banff National Park on making their highways safer for all. Banff is a world leader in wildlife crossings with wildlife-vehicle collisions being reduced by more than 80% and, for elk and deer alone, by more than 96%. No other location has as many and varied types of wildlife crossings.

Put our expertise in the design of effective animal-friendly crossings to work for you, with engineered solutions made from Ultra•Cor, Super•Cor or Bolt-A-Plate Structural Steel Plate. For project assistance, call toll free 1-877-245-7473 or one of our specialists.

Wildlife Crossings
and Fish Passages

Wildlife Overpass, Banff National Park, Alberta

corrugated-steel-pipe-animal-crossing structural-plate-wildlife-crossing
Wildlife Underpasses, Trans-Canada Highway, New Brunswick

Wildlife Overpass, Poland, EU (AIL International)

interior-structural-plate animal-crossing-structural-plate
Oil Sands Wildlife Underpass, Fort McMurray, Alberta                        
Wildlife Underpass, Kootenay National Park, BC 

Wildlife Crossing Projects:

Tight site calls for two-stage construction »


We also specialize in Fish Passage Solutions
According to the size and nature of the crossing, we offer a variety of solutions in Structural Plate, Corrugated Steel Pipe or Atlantic Arch with integrated footings. Corrosion/abrasion-resistant Dur•A•Span Structural Aluminum Plate is particularly well-suited to saltwater or aggressive environments. We can also provide specialized fish baffle inserts for some designs. 

fish-baffle-inserts culvert-reline-structural-steel-plate atlantic_arches6

Fish Passage Projects:

GRS fish passage is first project completed through national conservation program »

Multi-partner team keeps Maine crossing out of a Jam »


Minimal site impact

Our open-bottom structural plate crossings install quickly with less disruption to natural stream habitat when compared to their concrete counterparts. Plus, there is very little maintenance required over their service lives — further reducing impact for decades to come.

Wildlife Underpass, Route 1, New Brunswick


Recycled and recyclable steel

Many of AIL products use a high degree of steel, the world’s most-recycled material. Given the increased awareness of “green” construction, steel is the material of choice because of its major recycled content and recyclability attributes. Steel products use less energy to manufacture, ship and install than their concrete counterparts. 

Related Links and Resources


Significance of wildlife crossings, and general design/policy discussions:

Habitat Fragmentation due to Transportation Infrastructure, Wildlife and Traffic: A European Handbook for Identifying Conflicts and Designing Solutions (PDF) »
A general overview of why wildlife crossings are needed and how to design them.

A Guide to Road Ecology in Ontario (PDF) »
A presentation giving a general overview of wildlife crossing structures.

Gravel-bed river floodplains are the ecological nexus of glaciated mountain landscapes (PDF) »
Paper focusing on the importance of preserving riverbeds in mountain regions, implying that larger span, open bottom structures are biologically preferred.

Herpetofauna and Roads: How Can We Get Along? (PDF) »
ICOET 2015 DPW Paper summarizing best practices to reduce the cost of wildlife overpasses. AIL structures are included.  

Species-Focused Papers:

Larger Wildlife

Utah Wildlife Paper featuring data on wildlife movement for various species on bridges and culverts.

Wildlife Use of Highway Underpass Structures in Washington State (PDF) »
Washington State data is presented on wildlife movement through various structures. Includes an AIL Wildlife Underpass using a Super•Cor Structure.  
Copy of presentation deck for the above »

Banff bears use Trans-Canada wildlife crossings to find mates »
February 18, 2014 Article on CBC Website

Wildlife Crossings Are Win Win. The question is When When? »
Article on medium.com


Frogs on the Road  & One Elusive Salamander (PDF) »
Corrugated Steel Pipe Institute Project Profile on a herpetofauna crossing. 

Best Management Practices for Mitigating the Effects of Roads on Amphibian and Reptile Species at Risk in Ontario (PDF) » 
Ontario Ministry of Natural Resources and Forestry, April 2016 publication on how to design herpetofauna crossings. Contains AIL Forestry Arch and Corrugated Steel Pipe Solutions


Corrugated Steel Pipe Institute (CSPI) Fish Ladder Projects:

    April 19, 2016 

    February 17, 2016

    Presentation to Transportation Association of Canada Conference 2013

Paper summarizing better practices when sizing culverts/buried structures for fish passage. 

A Swedish brochure offering an overview, from a biological perspective, of how to design better aquatic crossings.

Wildlife Crossings Organizations: