Caltrans Grant Aims to Scale Up Wildlife Corridor Blueprint

Lessons learned from the landmark Wallis Annenberg Wildlife Crossing could soon be applied across Southern California, thanks to a new $700,000 Caltrans grant awarded to regional planning officials.

 

The funding is part of a $23.6 million package in planning grants announced by Caltrans for 58 local projects statewide aimed at enhancing climate resiliency, reducing greenhouse gas emissions and increasing natural disaster preparedness.

 

The grant arrives as the famous Wallis Annenberg Wildlife Crossing over U.S. 101 in Agoura Hills enters its final phase. The crossing is more than 60% complete with an official opening date of Dec. 2.

 

Despite pandemic-era inflation that pushed its final cost to $114 million and construction delays from historic winter storms, the massive bridge has a completed main freeway span.

 

While the Annenberg crossing successfully targeted a singular, critical bottleneck for the Santa Monica Mountains cougar population, regional planners argue that a piecemeal approach is no longer enough.

 

The Southern California Association of Governments will utilize the state funding for the Regional Wildlife Connectivity Study, an ambitious effort to move from a single-project model to a standardized, interconnected network.

 

Unlike the standalone effort in Agoura Hills, this study aims to create a systematic, data-driven blueprint covering a massive six-county transportation network. Partnering with the San Bernardino County Transportation Authority, SCAG will equip local jurisdictions with data products, mapping tools, and strategic guidelines.

 

The goal is to make wildlife infrastructure—such as vegetated overpasses, underpasses and directional fencing—a standard, cost-effective feature of future highway development rather than an extraordinary exception.

 

Beyond protecting individual animal populations from localized extinction and genetic inbreeding, the study addresses broader climate vulnerabilities. Fragmented habitats diminish Southern California's natural carbon sequestration potential, a critical issue as the state pushes toward aggressive climate adaptation mandates.

 

The SCAG region encompasses six counties—Imperial, Los Angeles, Orange, Riverside, San Bernardino and Ventura—representing one of the most ecologically diverse yet heavily paved landscapes in the United States.