Quick Take
- I-25 Greenland Wildlife Overpass is North America’s largest wildlife crossing, spanning 6 lanes, 200 ft wide, 209 ft long, and 41,800 sq ft.
- Located on I-25 in Douglas County near Larkspur, between Castle Rock and Monument, around mile 165.
- $15 million construction cost, Kraemer North America leads, with FHWA, CDPW, Douglas County, and Wildlife Crossings Pilot Program backing.
- Read on to discover how the project closes the 3.7-mile gap within the 18-mile wildlife-mitigation system.
Colorado’s newest wildlife crossing is an overpass, one built so animals can walk over one of the state’s busiest highways like it isn’t even there. This particular stretch between Denver and Colorado Springs has been an issue for migrating and roaming wildlife, and it has also been a repeat offender for crashes, endangering animals and humans alike.
Known as the I-25 Greenland Wildlife Overpass, state officials say this major project is now open for wildlife use as of December 2025. Crews are completing the final steps, such as covering the surface of the structure with soil and vegetation to make it more comfortable and safe for animals. In a corridor where frequent accidents influenced the entire design of this overpass, how important is it, and what could it change for Colorado’s wildlife?
Here’s everything you need to know about Colorado’s new wildlife crossing, including where it is and how this crossing came to be in the first place.
Where Is the Wildlife Crossing Located?
Colorado’s new wildlife overpass sits on I-25 in Douglas County near Larkspur, a stretch that runs between Castle Rock and Monument. It is roughly around mile point 165, and the crossing was ultimately built to handle one of the more dangerous portions of this highway…