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Wallis Annenberg Wildlife Crossing Hits Key Construction Milestone

Crews have begun placing soil on the world's largest wildlife crossing, advancing efforts to reconnect habitats over California's 101 Freeway.

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First layers of soil and the building of rock features, continue on Monday, March 31, 2025, on the surface of Wallis Annenberg Wildlife Crossing launching what will become a nearly 1-acre native wildlife habitat above ten lanes of the 101 in Agoura Hills. (Photo by Dean Musgrove, Los Angeles Daily News/SCNG)
The cougar known as P-22 featured in an award-winning 2021 photograph before dying after a traffic collision

Overview

  • The Wallis Annenberg Wildlife Crossing, spanning 10 lanes of the 101 Freeway in Agoura Hills, will be the largest wildlife bridge in the world upon completion in 2026.
  • On March 31, 2025, workers began laying 6,000 cubic yards of specially designed soil, marking the near completion of Stage 1 of the project.
  • The crossing will feature native vegetation, including 50,000 plants and 12 acres of restored open space, to create a sustainable habitat for mountain lions, bobcats, deer, and other species.
  • This $92-million project, funded by state and private contributions, aims to address habitat fragmentation and genetic isolation among wildlife in the Santa Monica Mountains.
  • Once completed, the crossing is expected to serve as a global model for urban wildlife conservation and ecological connectivity.