US EditionIn a milestone, crews place soil on wildlife crossing over 101 freeway
- On Monday, March 31, 2025, construction crews began placing the first layers of soil on the Wallis Annenberg Wildlife Crossing, located over the Ventura Freeway in Agoura Hills between 7-10 a.m.
- This milestone event follows years of meticulous work and close collaboration among soil scientists, biologists, engineers, and mycologists to select the best soil and beneficial fungi for the bridge, which broke ground on Earth Day 2022.
- The soil placement will create a nearly 1-acre native wildlife habitat across 10 lanes of the freeway, eventually featuring about 5,000 native plants, including coastal sage scrub, to support various animal species.
- Approximately 6,000 cubic yards of soil will be needed to cover the entire crossing, and the wildlife crossing's native plant nursery has hand-picked more than 1.1 million hyper-local native seeds, representing over 50 distinct native plant species from the Santa Monica Mountains.
- Scheduled for completion in 2026, the crossing, overseen by Rock Design Associates with aid from experts, will include a full irrigation system and is expected to serve as a global model for urban wildlife conservation, reducing fire risk, better supporting wildlife, and ensuring the survival of many isolated species.
15 Articles
15 Articles
World’s largest wildlife crossing reaches critical milestone. Now what?
By Jeanette Marantos, Los Angeles Times LOS ANGELES — Monday was momentous for the Wallis Annenberg Wildlife Crossing although it still looked like a bridge to nowhere from the 101 Freeway, where more than 300,000 vehicles stream endlessly every day. Nearly three years after the project began, the critical milestone was visible only to the government officials, scientists and longtime supporters who climbed to the top: soil. And not just any soi…
First layers of soil to be laid on 101 Freeway wildlife crossing in California, the world's largest
The wildlife crossing designed to help mountain lions, deer, bobcats and other creatures safely travel over the 101 Freeway between the Simi Hills and the Santa Monica Mountains will reach a major milestone on Monday, as workers lay the first layers of soil on the overpass.
Pasadena Star News
In a milestone, crews place soil on wildlife crossing over 101 freeway
President and CEO Robert Rock, of Rock Design Assoc., shows the first layer of soil for the Wallis Annenberg Wildlife Crossing, a wildlife habitat bridge being built for mountain lions and other animals to safely cross over 10 lanes of traffic on the 101 Freeway, in Agoura Hills on Monday, March 31, 2025. (Photo by Sarah Reingewirtz, Los Angeles Daily News/SCNG) The first layer of soil is craned onto the Wallis Annenberg Wildlife Crossing, a wil…
Southern California wildlife crossing construction reaches major milestone
Construction on the Wallis Annenberg Wildlife Crossing reached a major milestone on Monday. Workers began laying dirt down on the bridge spanning the 10 lanes of the 101 Freeway in Agoura Hills that will allow wildlife to cross over the freeway safely. Aerial footage from Sky5 provided a better view of crews working to lay more than 6,000 cubic yards of soil as the sun broke through the clouds Monday morning. Aerial footage from Sky5 provide…
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