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Where time, nature, and rush hour collide

Backcountry study on where and how wildlife can safely cross Highway 67

Megan Jennings and a bobcat
Megan Jennings and a bobcat

As dangerous as Highway 67 is for drivers, it is even trickier for the wildlife that live in the rich habitat on either side, so when Caltrans looked at placing barriers down the middle for vehicle safety, the agency started talking with Dr. Megan Jennings, a conservation ecologist and post-doctoral researcher who has worked on projects with UCSD and SDSU.

Coyote with lunch
Skunk
Gray fox
Raccoon
Mule deer
Bobcat

“It falls right in the middle now where the animals have to cross [the road] to utilize both sides of open space in the multispecies protection plan,” she says. Jennings studied the area between Mapleview Street in Lakeside and Dye Road in Ramona — identifying the most common wildlife crossings by tracking and studying roadkill. Then she set up infrared cameras at the most common crossings.

“There’s been at least one mountain lion, ringtail — which is a cat-looking mammal that’s actually related to raccoons, coyote, deer, bobcat, and gray fox, and all the animals you’d expect: raccoons, possum, skunks,” she said.

Based on a preliminary study, she found three or four areas that will be problematic: on the grade coming up to Fosters Truck Trail south of Scripps Parkway, the area around Iron Mountain, the Mt. Woodson area, and the area leading into Ramona where the road narrows to two lanes but people drive fast. It isn’t just about protecting the individual critters.

“It’s about preserving gene flow and stable populations of these animals,” she said. “And the highway is already dangerous for drivers, but when you add on top trying to avoid an animal — your natural instinct is to try to avoid them.”

Jennings’s studies led her to culverts under the highway — drainage pipes of corrugated steel or concrete box-shaped tunnels. Many were blocked by growth or fences, but wildlife seemed to be okay with going under the road.

“The types of crossings a deer would use are different than what a mountain lion prefers — mountain lions like things that are a little more open, while deer are prey and they don’t like to be out in the open — they prefer places they can blend in and where they can see the end of the tunnel from the beginning.

Examining roadkill — usually reduced to picked-clean bones — taught Jennings about an odd place where time, nature, and rush hour collide.

“The highest rates of roadkill coincide with times of early nightfall, when rush hour lines up with dusk. That time of year, deer are in rut [mating season], coyotes are looking for a partner, and the predators that come out at night meet up with a lot of drivers in a hurry to get home,” Jennings said.

The solutions Jennings and Caltrans are contemplating include clearing the culverts and making the approaches to them more straightforward. The idea is to lead the animals to where it’s safe for them to cross.

“Make it bigger, wider so animals can see the end of the tunnel is one idea,” she said. “Better lighting and clearing the culverts for better animal visualization would help a lot.”

And there’s a special idea in play — an animal bridge over the highway at Mt. Woodson. It’s just an idea at this point, but it has worked in other places, including Los Angeles, with its mountain lion bridge.

“Because of the steep hills on either side, it might be the best idea to keep the animals off the road entirely — it would take a lot of study to do it right so it worked for the animals,” Jennings said.

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Megan Jennings and a bobcat
Megan Jennings and a bobcat

As dangerous as Highway 67 is for drivers, it is even trickier for the wildlife that live in the rich habitat on either side, so when Caltrans looked at placing barriers down the middle for vehicle safety, the agency started talking with Dr. Megan Jennings, a conservation ecologist and post-doctoral researcher who has worked on projects with UCSD and SDSU.

Coyote with lunch
Skunk
Gray fox
Raccoon
Mule deer
Bobcat

“It falls right in the middle now where the animals have to cross [the road] to utilize both sides of open space in the multispecies protection plan,” she says. Jennings studied the area between Mapleview Street in Lakeside and Dye Road in Ramona — identifying the most common wildlife crossings by tracking and studying roadkill. Then she set up infrared cameras at the most common crossings.

“There’s been at least one mountain lion, ringtail — which is a cat-looking mammal that’s actually related to raccoons, coyote, deer, bobcat, and gray fox, and all the animals you’d expect: raccoons, possum, skunks,” she said.

Based on a preliminary study, she found three or four areas that will be problematic: on the grade coming up to Fosters Truck Trail south of Scripps Parkway, the area around Iron Mountain, the Mt. Woodson area, and the area leading into Ramona where the road narrows to two lanes but people drive fast. It isn’t just about protecting the individual critters.

“It’s about preserving gene flow and stable populations of these animals,” she said. “And the highway is already dangerous for drivers, but when you add on top trying to avoid an animal — your natural instinct is to try to avoid them.”

Jennings’s studies led her to culverts under the highway — drainage pipes of corrugated steel or concrete box-shaped tunnels. Many were blocked by growth or fences, but wildlife seemed to be okay with going under the road.

“The types of crossings a deer would use are different than what a mountain lion prefers — mountain lions like things that are a little more open, while deer are prey and they don’t like to be out in the open — they prefer places they can blend in and where they can see the end of the tunnel from the beginning.

Examining roadkill — usually reduced to picked-clean bones — taught Jennings about an odd place where time, nature, and rush hour collide.

“The highest rates of roadkill coincide with times of early nightfall, when rush hour lines up with dusk. That time of year, deer are in rut [mating season], coyotes are looking for a partner, and the predators that come out at night meet up with a lot of drivers in a hurry to get home,” Jennings said.

The solutions Jennings and Caltrans are contemplating include clearing the culverts and making the approaches to them more straightforward. The idea is to lead the animals to where it’s safe for them to cross.

“Make it bigger, wider so animals can see the end of the tunnel is one idea,” she said. “Better lighting and clearing the culverts for better animal visualization would help a lot.”

And there’s a special idea in play — an animal bridge over the highway at Mt. Woodson. It’s just an idea at this point, but it has worked in other places, including Los Angeles, with its mountain lion bridge.

“Because of the steep hills on either side, it might be the best idea to keep the animals off the road entirely — it would take a lot of study to do it right so it worked for the animals,” Jennings said.

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4S Ranch Allied Gardens Alpine Baja Balboa Park Bankers Hill Barrio Logan Bay Ho Bay Park Black Mountain Ranch Blossom Valley Bonita Bonsall Borrego Springs Boulevard Campo Cardiff-by-the-Sea Carlsbad Carmel Mountain Carmel Valley Chollas View Chula Vista City College City Heights Clairemont College Area Coronado CSU San Marcos Cuyamaca College Del Cerro Del Mar Descanso Downtown San Diego Eastlake East Village El Cajon Emerald Hills Encanto Encinitas Escondido Fallbrook Fletcher Hills Golden Hill Grant Hill Grantville Grossmont College Guatay Harbor Island Hillcrest Imperial Beach Imperial Valley Jacumba Jamacha-Lomita Jamul Julian Kearny Mesa Kensington La Jolla Lakeside La Mesa Lemon Grove Leucadia Liberty Station Lincoln Acres Lincoln Park Linda Vista Little Italy Logan Heights Mesa College Midway District MiraCosta College Miramar Miramar College Mira Mesa Mission Beach Mission Hills Mission Valley Mountain View Mount Hope Mount Laguna National City Nestor Normal Heights North Park Oak Park Ocean Beach Oceanside Old Town Otay Mesa Pacific Beach Pala Palomar College Palomar Mountain Paradise Hills Pauma Valley Pine Valley Point Loma Point Loma Nazarene Potrero Poway Rainbow Ramona Rancho Bernardo Rancho Penasquitos Rancho San Diego Rancho Santa Fe Rolando San Carlos San Marcos San Onofre Santa Ysabel Santee San Ysidro Scripps Ranch SDSU Serra Mesa Shelltown Shelter Island Sherman Heights Skyline Solana Beach Sorrento Valley Southcrest South Park Southwestern College Spring Valley Stockton Talmadge Temecula Tierrasanta Tijuana UCSD University City University Heights USD Valencia Park Valley Center Vista Warner Springs
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