North America's Largest Wildlife Crossing Opens in Colorado, Connecting Elk and Pronghorn Migration Routes

The Greenland wildlife crossing in Douglas County, Colorado — the largest wildlife overpass in North America — was highlighted in reporting on its role connecting critical migration corridors for elk, pronghorn, mule deer, black bear, and mountain lion across six lanes of Interstate 25. The structure, which opened in early 2026, is projected to reduce wildlife-vehicle collisions by up to 90% in the corridor. Conservation scientists praised the $30+ million investment as a model for integrating wildlife connectivity into highway infrastructure. The crossing completes a vital link in the Rocky Mountain Front Range migration network, allowing ungulate herds to access traditional winter and summer ranges that had been fragmented by I-25 for decades.