Elk, pronghorn, mule deer, black bears, and mountain lions now have a new way to safely cross Interstate 25 near Larkspur following the completion of the Greenland Wildlife Overpass. The Colorado Department of Transportation (CDOT) announced that construction of the overpass was finished earlier this month. The surface of the overpass has been covered with dirt and vegetation to support wildlife movement.
The I-25 Greenland Wildlife Overpass is currently the largest such structure in North America. It spans six lanes of traffic and connects 39,000 acres of habitat on both sides of I-25 between Larkspur and Monument.
Governor Polis commented on the significance of the project: “Colorado is leading the way in reducing wildlife-vehicle collisions, and improving safety for both our motorists and wildlife. The I-25 Greenland wildlife overpass is a momentous feat, in our continued work to expand safe transportation options for both humans and wildlife, protecting critical habitat and our amazing outdoor spaces for generations to come.”
Shoshana Lew, CDOT Executive Director, said: “The I-25 Greenland wildlife overpass is critical to the safety of both wildlife and motorists. The overpass is an essential component of the wildlife crossing system in this area, which is expected to reduce wildlife-vehicle crashes by 90%.”
The overpass fills a 3.7-mile gap between existing crossings as part of CDOT’s broader South Gap project. This initiative improved an 18-mile stretch from Castle Rock to Monument by installing underpasses and fencing designed to reduce vehicle collisions with animals. Before these measures were put in place, there was about one crash involving wildlife each day during peak migration seasons.
CDOT’s studies indicate that five underpasses along this corridor are already being used by various mammals. However, elk and pronghorn prefer wider structures like this new overpass for safe passage across highways.
The location was chosen due to its connection between important corridors for migrating animals and its proximity to water sources. This area also sees frequent movement by large game species.
