Context photograph · California Department of Fish and Wildlife from Sacramento, CA, USA · Original photograph · CC BY 2.0. An archive photograph for context, not a claim of on-scene reporting.
Can a freeway get a green roof? In Agoura Hills, California, it is getting one.
The Wallis Annenberg Wildlife Crossing is designed to reconnect habitat across US 101, giving wildlife a planted route above traffic instead of another risky dash across pavement.
Why does one bridge matter?
US 101 slices through the Santa Monica Mountains landscape. Caltrans says that barrier limits animal movement, separates habitat and can reduce genetic exchange between wildlife populations.
A normal overpass moves cars. This one is being built for animals and covered with native vegetation, so the crossing itself works more like a narrow piece of habitat.
The hopeful part is simple:
the road stays, but the habitat does not have to stay broken.
Is the crossing finished yet?
Not quite. Caltrans says Stage 1 was completed in June 2025. Stage 2—including more habitat work—is planned for completion in 2026, but the agency also notes that construction dates can change.
Current project snapshot
The structure is about 210 feet long and 174 feet wide. Caltrans lists an estimated project cost of about $92 million.
That width matters because the goal is not a skinny sidewalk for one photogenic animal. The project is meant to support movement by multiple species and carry a real layer of plants and soil.
Will mountain lions use it?
The crossing was planned with mountain lions and other wildlife in mind, but a bridge cannot promise which animal will arrive first. Plant establishment, nearby fencing and the connected habitat on both sides all matter.
So the useful milestone is not a single dramatic photo. It is whether the finished landscape becomes a safe, repeatable route over time.
Think of it as habitat lifted over traffic, not a road decorated with a little greenery.
What is worth watching next?
Watch Caltrans project updates for the Stage 2 finish and planting progress. After opening, credible wildlife-monitoring results will tell us more than social-media guesses about who crossed first.
For now, the concrete structure already makes one encouraging idea visible: even an old transportation barrier can be redesigned to reconnect the landscape around it.
Sources
Caltrans: Wallis Annenberg Wildlife Crossing project page (accessed October 23, 2026).