A wildlife overpass in Colorado has reduced vehicle-animal collisions by 91% in its first 10 months of operation, according to a newly released report. The structure serves as a bridge over a busy interstate and connects 39,000 acres of habitat for multiple species.
Colorado officials have documented elk, bears, pronghorn, and northern leopard frogs using the crossing. The overpass functions as part of a larger wildlife crossing system constructed by the state. That system also includes miles of 8-foot tall fencing and five large wildlife underpasses designed to help animals safely navigate the highway.
The dramatic reduction in collisions demonstrates the effectiveness of dedicated wildlife crossing infrastructure in mitigating human-animal conflict along major transportation corridors. The multimodal approach combining above-ground overpasses with fencing and underpasses creates multiple pathways for different species and body sizes to move between habitat areas without encountering vehicle traffic.
This integrated crossing system represents a substantial investment in wildlife protection and habitat connectivity. By enabling animals to move freely across the interstate, the infrastructure helps maintain genetic diversity within populations and allows wildlife to access resources across fragmented landscapes. The 91% collision reduction translates directly to saved animal lives and reduced vehicle damage and human safety risks associated with wildlife strikes.
The success of Colorado's project provides evidence that well-designed wildlife crossing infrastructure produces measurable conservation benefits. Other states and transportation departments facing similar challenges with animal-vehicle collisions may look to this model as they consider their own crossing projects. The combination of overpasses, underpasses, and fencing creates redundancy and accommodates the diverse crossing preferences and physical capabilities of different species moving through the landscape.