Safe Passage

The I-40 Pigeon River Gorge Wildlife Crossing Project

wildlife crossings

NCDOT to begin construction on wildlife crossing at Harmon Den

The bridge over Harmon Den Road at Interstate 40 Exit 7. Photo courtesy of Google Maps Satellite imagery

On Nov. 3, 2021, the North Carolina Department of Transportation announced preparations for significant construction on Interstate 40 over Harmon Den Road, at Exit 7 in Haywood County. Starting as soon as Nov. 9, a contractor for the NCDOT will begin work to replace the bridge at this exit, integrating wildlife crossings into the new structure.

The Harmon Den area has long been a hotspot for wildlife-vehicle collisions, and Safe Passage: The I-40 Pigeon River Gorge Wildlife Crossing Project has advocated for building a wildlife crossing at this location. When the NCDOT announced plans to replace the existing bridge structure here, Safe Passage and its partners collaborated with the agency for a safe solution to fit this particular site.

The plans for the new Harmon Den bridge include two paths — one on each side of Cold Springs Creek — to help wildlife migrate from one side of the interstate to the other without encountering vehicles. A 9-foot tall fence will guide animals to the trails, away from traffic and under the bridge. 

NCDOT is also evaluating the use of wildlife guards — similar to slotted cattle guards — to prevent deer and elk from walking up the ramps. These measures will hopefully encourage wildlife to cross under the bridge and reduce the possibility of animal accidents. 

“We are excited to be adding protections for wildlife in this and other upcoming NCDOT projects,” said Division 14 Engineer Wanda Austin in a press release from the NCDOT. “We have worked with a wide variety of interest groups, transportation, and wildlife experts to incorporate these unique features to benefit the people who drive the gorge, and the animals that live in the gorge.”

Austin has been a participating stakeholder in the Safe Passage collaborative since its inception in 2017.

The traffic management plan for this project includes a six-month detour around the bridge, with drivers utilizing the exit and onramps. 

In late October and early November, construction crews from contractor Kiewit Infrastructure South have been mobilizing equipment and preparing to begin significant construction activities. By the first week of November, crews had already begun upgrading the exit and entrance ramps. 

As soon as mid-November, all traffic will be funneled into a one-lane pattern prior to the bridge and will use the ramps as a detour around the bridge. Traffic will remain in this pattern into May 2022 while crews remove and replace the deteriorating structure. 

In a feature article published by the Asheville Citizen Times on Nov. 5, Jeff Hunter, National Parks Conservation Association senior program manager and Safe Passage facilitator, thanks the NCDOT for its collaborative work to make I-40 a safer place for wildlife and motorists alike.

Black bears, elk, whitetail deer and other, smaller animals live in the surrounding mountains and naturally migrate across the area — and across the highway — looking for food, mates and habitat, Hunter told the Citizen Times.

In addition to the unique wildlife features, this five-bridge project is also the first of its kind in the state to be administered in a new method with the intent of forming a partnership between the NCDOT, the contractor and the design team. Kiewit Infrastructure earned the $19 million contract for the first of the five, which has a final completion date set in May 2024.

Exit 7 from I-40, where construction will soon begin to replace the existing bridge structure and add crossings for wildlife.

The current I-40 overpass as viewed from Harmon Den Road.

The result of the new construction manager/general contractor method is lower costs and expedited delivery from the first step in the design phase to the last inspection of the new bridge, and new safe passage underneath.

Drivers desiring to go from Asheville to Dandridge, Tenn., may choose to take I-26 West to Kingsport and then I-81 South to Dandridge. This route adds about 45 minutes to driving time compared to a typical trip through the gorge.

Accommodation or decimation: It’s time to choose how we share our mountains

Before you can solve a problem, you have to understand it. Like many other roadways around the nation, the Safe Passage project area — a 28-mile stretch along I-40 in western North Carolina and east Tennessee — has created a “barrier effect” for wildlife, fragmenting species’ habitats and separating wild animals from their needs.

Safe Passage is part of a growing national and global effort to create safe crossings for wildlife. Using a study and process known as road ecology, Safe Passage aims to help its target region plan and implement a variety of crossing structures, from culverts to bridge extensions and overpasses, designed just for animals.

A combination of fencing and crossing structures has been used successfully in countries all over the world, from France and Germany to Singapore and South Korea. In North America, Canada and Mexico have also successfully created effective crossings, and now, states like California, Colorado, Texas, Virginia, Washington and Utah are focusing on road ecology too.

Before coalition partners can begin increasing highway safety for animals and humans alike, states’ Departments of Transportation need scientific data to make informed plans. For the last two years, National Parks Conservation Association and Wildlands Network have been conducting field research to evaluate how roadways outside Great Smoky Mountains National Park influence black bear, white-tailed deer, and elk.

The researchers’ multi-faceted approach assesses wildlife’s use of existing structures, road mortality, and activity within the highway right-of-way. It also identifies and predicts elk road-crossing locations using movement information from GPS-collared elk. This will help identify areas along the interstate where mitigation strategies such as fencing and crossing structures could be best implemented to reduce wildlife–vehicle collisions and increase habitat connectivity.

Safe Passage shares Wildlife Crossings in the Smokies virtual program video

On January 28, Safe Passage hosted an educational virtual program with Jeff Hunter, senior program manager with National Parks Conservation Association in Asheville. In a free online event, facilitated through Zoom, Hunter spoke on recent innovations to provide safe passage options for wildlife. The event was co-sponsored by the Tennessee Citizens for Wilderness Planning and the UT Arboretum Society.

Hunter’s work includes issues related to Great Smoky Mountains National Park, the Blue Ridge Parkway, and the Appalachian National Scenic Trail. He also led the Tennessee Wild wilderness campaign focused on permanently protecting nearly 20,000 acres in the Cherokee National Forest, including 4.5 miles of the Appalachian Trail.

To host your own presentation (currently virtual-only, but with in-person availability in the future) for your civic group, organization, school or classroom, please visit our Educate Your Group page and inquire about event bookings.