March 13, 2020
Patty Garvey-Darda loves pikas, which are small mammals related to rabbits. “I think they are about the cutest animals alive,” she told TIME for Kids. Garvey-Darda is a wildlife biologist with the United States Forest Service. She wants to protect pikas and other creatures from a common threat: vehicles . The Federal Highway Administration says more than a million roadway accidents involving animals happen each year in the U.S. These collisions hurt wildlife and people.
One solution to this problem? Wildlife crossings. In the U.S. and around the world, bridges and underpasses are being built to help animals safely cross roads.
Banff National Park, in Alberta, Canada, is home to some of the most successful wildlife crossings. Completed in 2014, the crossings include 38 underpasses and six overpasses, or bridges. They prevent the park’s animals, such as grizzly bears and cougars, from being struck while trying to cross the Trans-Canada Highway, which bisects the park. According to Parks Canada, Banff’s crossing system has reduced collisions with wildlife by more than 80%.
“People study the effectiveness of the crossings in Banff” as a guide for new construction projects, says Rob Ament. He works for the Western Transportation Institute at Montana State University. Ament notes Banff’s “high quality of design,” which includes fencing to direct animals away from roads.
Ament is using his expertise on wildlife crossings for a project in Assam, India. One of the state’s highways is on the border of Kaziranga National Park. Elephants, rhinos, and tigers live there. “Animals leave the park to go up a dry hill during monsoon season,” Ament says. “That means they have to cross the highway.” Plans are in the works for a safe pathway beneath it.
Safe pathways for wildlife have been built in several U.S. states, including Arizona, Utah, and Wyoming. In Washington State, Garvey-Darda is part of a major project. She’s helping to design a set of about 20 wildlife crossings. “Banff has been the best model for us,” she says. The Washington State crossings are being built along a 15-mile stretch of Interstate 90 (I-90), one of the country’s longest highways. This section of the highway cuts across the Cascade mountain range. It has disrupted the migration patterns of animals in the area.
Construction of the 20 crossings is expected to be completed by 2029. So far, six underpasses and one overpass have been built. Garvey-Darda says these crossings have already made a difference for migrating animals. “We now have close to 5,000 deer and elk going through the undercrossings,” she says. “All of these animals were potential accidents.”
This spring, Washington locals can volunteer to plant vegetation on the I-90 overpass. Garvey-Darda says the plants will encourage animals, including her beloved pika, to use the crossings. “It’s important to be proactive ,” she says, “and not wait until a species is endangered.”