When it comes to states with the most wildlife overpasses and crossings, Colorado definitely leads the pack. As of 2025, the state has over 100 structures — including underpasses and overpasses — with more projects underway.
Colorado’s most recent wildlife overpass is the Greenland Wildlife Overpass along I-25, which also doubles as the largest wildlife overpass in the world.
According to Colorado Governor Jared Polis, the overpass was completed in less than a year, “ahead of schedule and on budget.”…