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The Colorado Highway 9 Wildlife Crossing Project
The Colorado Highway 9 Wildlife Crossing Project

​A Safe Passage


​Wildlife including mule deer, elk and bear are now able to safely cross a busy highway in Colorado thanks to a transportation solution designed to help protect wildlife and motorists from highway collisions.

In 2016, the Colorado Department of Transportation (CDOT), in cooperation with Colorado Parks and Wildlife (CPW) and many other partners, completed Colorado’s first-of-its-kind wildlife overpass and underpass system on Highway 9 between Green Mountain Reservoir and Kremmling. This innovative solution to keeping wildlife off a busy road resulted in a 90 percent reduction in wildlife-vehicle collisions.

The nearly 11-mile stretch of road bisects important wildlife habitat and movement corridors, specifically​, mule deer and elk winter range. Prior to the project, an average of 63 wildlife carcasses were recorded along this stretch of road each winter, 98 percent of which were mule deer. Wildlife-vehicle collisions accounted for 35 percent of all reported crash types from 2007-2011, according to CDOT. The Highway 9 wildlife safety improvement project was designed to improve driver safety while maintaining connectivity of wildlife movement across the road.

This project includes:

  • two wildlife overpasses,
  • five wildlife underpasses,
  • nine pedestrian walk-throughs,
  • 62 wildlife escape ramps,
  • 29 wildlife guards, all of which are connected by an eight foot high wildlife fence. 

Effectiveness Monitoring

ribbon cutting​CDOT, CPW and ECO-resolution initiated a 5-year effectiveness monitoring study in 2015 to be concluded in May 2020. During the first four years of monitoring, there have been over 83,000 mule deer success movements through or over the seven crossing structures. Combined with an overall success rate of 96% of mule deer utilizing the structures, these results indicate that the project has been highly effective in accommodating mule deer movement. Other species using the structures, although fewer in number, include elk, pronghorn, moose, bighorn sheep, black bear, mountain lion, and coyote. There has also been at least one recorded underpass crossing by turkeys and river otters.   

Researchers are also evaluating the effectiveness of wildlife guards, escape ramps and fence-ends. The effectiveness of these mitigation features are important to keep animals out of the fenced right-of-way or to allow animals a safe method to exit if they get into the fenced right-of-way.  

Read more:

​A Safe Passage Slideshow