In a remarkable display of nature’s resilience, three mule deer have been spotted crossing a nearly finished $20 million wildlife bridge in Siskiyou County, California. This development is a significant milestone for the California Department of Transportation (Caltrans) and heralds a new era in wildlife conservation and road safety.
A Pioneering Initiative
The newly constructed wildlife bridge, located over Route 97, is the first of its kind to be built over a major highway in California. The initiative aims to enhance driver safety while simultaneously reducing the risks faced by migrating wildlife, including not just mule deer, but also elk and various other species. Fraser Shilling, director of the Road Ecology Center at the University of California, Davis, described the bridge as “our first over-crossing laboratory in California,” a unique opportunity to gather insights that could lead to improved designs in the future.
Recent footage captured by a camera trap shows the three mule deer using the bridge for the first time, indicating that wildlife is already adapting to this new structure, even while construction work continues nearby. “While the contractor is still completing final touches, it’s incredible to see wildlife already embracing the new structure,” Caltrans District Two shared on their Facebook page, noting that other animals, such as a bobcat, have also been observed using the crossing.
The Importance of Fencing
While the bridge itself is operational, the accompanying fencing, which funnels animals towards the crossing, remains incomplete. Shilling emphasised the vital role of fencing in preventing roadkill, stating, “Wildlife crossings by themselves do not stop roadkill. It’s the fencing associated with them that stops roadkill.” A report published in 2024 by the Road Ecology Center, which Shilling co-authored, highlighted the alarming statistic that nearly 50,000 mule deer are killed on California roads annually, accounting for approximately 10% of the state’s deer population. The report also noted that around 100 mountain lions fall victim to car crashes each year, alongside thousands of other animals from diverse species.
Addressing a Growing Crisis
The establishment of this wildlife crossing is a crucial step toward reducing these preventable deaths. Between 2015 and 2020, Caltrans recorded the loss of approximately 50 deer and 16 elk at the site of the new bridge, underlining the pressing need for such solutions. As more wildlife crossings are planned, the largest of these, the Wallis Annenberg Wildlife Crossing in Southern California, is set to become the world’s largest when it opens later this year, spanning the extensive 10-lane 101 freeway.
Shilling praised Caltrans for their forward-thinking investment in this innovative crossing, calling their efforts “heroic.” He remarked, “Within agencies like that, doing anything different means you’ve got big ovaries,” highlighting the courage required to implement such groundbreaking projects.
Why it Matters
The construction of wildlife crossings like the one in Siskiyou County represents a vital intersection of infrastructure and environmental stewardship. By prioritising the safety of both wildlife and motorists, California is setting a precedent for other states to follow. With the current crisis of wildlife-vehicle collisions threatening biodiversity and human safety alike, initiatives like these are not just beneficial—they are essential for creating a more harmonious coexistence between humans and the natural world. The success of this project could inspire broader measures across the nation, paving the way for safer roads and healthier ecosystems.
