Why Wildlife Overpasses Are Built
Colorado experiences a high volume of wildlife–vehicle interactions each year, particularly involving large mammals such as deer and elk. These wildlife collisions create safety risks for motorists and the wildlife and lead to costly vehicle damage. As traffic increases along the Front Range, wildlife overpasses have become a practical tool for guiding animals across highways in a controlled and predictable way.
The Greenland overpass spans six traffic lanes and reconnects habitat on both sides of the roadway. By restoring a natural movement route, the structure helps animals cross without entering traffic corridors.
How Effective Are Overpasses?
Long-term studies across North America and Europe show that wildlife overpasses and underpasses deliver consistent results. When combined with directional fencing, these structures reduce wildlife–vehicle collisions by 80 to 90 percent in surrounding areas.
Monitoring from similar projects shows that animals begin using crossings soon after completion, often within the first year. Usage increases when overpasses align with established seasonal movement patterns.
A Long-Term Infrastructure Investment
Large wildlife overpasses typically cost several million dollars to construct. Over time, reduced collision-related expenses help offset these upfront costs. Fewer crashes mean lower emergency response needs, reduced vehicle repair claims, and improved traffic flow.
These crossings also support long-term population stability by maintaining movement between habitat areas, an important factor in rapidly developing regions.
Takeaway
The Greenland wildlife overpass illustrates how science-based road design improves safety, reduces long-term costs, and supports connected landscapes. Conservation Frontlines focuses on examining these kinds of management-driven solutions that balance human infrastructure with long-term wildlife outcomes.