Massive Wildlife Bridge Makes Roads Safer for Animals and Drivers

The United States opened North America’s largest wildlife crossing in Colorado in 2025, reconnecting habitats and reducing animal-vehicle collisions by up to 90% on a major highway.

“This project shows how we can design infrastructure that protects both people and wildlife,” said Shoshana Lew, executive director of the Colorado Department of Transportation.

The Greenland Wildlife Overpass spans about 200 feet across Interstate 25 and restores connectivity between 39,000 acres of land used by elk, deer and pronghorn. Built as part of an 18-mile mitigation system including fencing and underpasses, it addresses a corridor that previously saw roughly one wildlife-related crash per day. Similar projects have reduced collisions by over 80% elsewhere, and with around 2 million wildlife-vehicle incidents occurring annually in the United States, the structure offers a scalable model to improve road safety while supporting biodiversity and long-term ecosystem health.