In December 2025, Colorado’s Department of Transportation finished the Greenland Wildlife Overpass over I‑25 near Larkspur, connecting 39,000 acres of habitat.
The 200‑foot‑wide, 209‑foot‑long structure sits atop six traffic lanes and is covered with soil and native grass, a design that lets elk, pronghorn, mule deer, and black bears see and cross the highway as if it were part of the surrounding landscape.
A state‑commissioned study of the 18‑mile corridor from 2022 to 2024 shows wildlife‑vehicle collisions fell 85% on average and 91% in the final year, a drop that the overpass and its five underpasses, fencing, and guide posts largely drove.
Camera footage captured herds of elk and pronghorn crossing the overpass, while smaller species such as rabbits and northern leopard frogs have also used the bridge, confirming the design’s effectiveness for both large and small animals.
The $15 million project was funded largely by the U.S. Department of Transportation’s Wildlife Crossings Pilot Program and built in partnership with CDOT, Colorado Parks and Wildlife, Douglas County, and conservation groups, and officials say the system will be expanded to other high‑traffic corridors across the state.