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Los Angeles' Wildlife Crossing Targets Dec. 2 Opening as El Niño Threatens Delays
The Wallis Annenberg Wildlife Crossing over the 101 Freeway has entered its final construction phase, targeting a Dec 2 opening; the project's lead landscape architect warns that heavy El Niño rains would halt work because the clay-rich soil cannot be compacted when wet.
Why it matters
The world's largest wildlife crossing will reconnect mountain lion habitat severed by the 101 Freeway — the Santa Monica Mountains and the Simi Hills — addressing a genetic-diversity crisis caused by inbreeding.
Latest progress
The structure already spans ten lanes of the 101 Freeway in Agoura Hills, topped with about 6,000 native plants. It is now in its most delicate phase: filling gaps between the freeway, Agoura Road and the northern landscape with millions of cubic feet of soil. The target opening date is December 2, 2026, and the project costs about $114 million.
El Niño threat
Lead landscape architect Robert Rock warns the area's clay-rich soil turns dangerously slick when wet and will not compact — if the rains arrive, work stops. The historic rains of the 2022–2023 winter already delayed the project. Beth Pratt, president of the Wildlife Crossing Fund, said at a construction update that she hopes El Niño weather will not interfere with the final phase.
Controversy
The project has drawn criticism from conservative commentators who call it a "bridge to nowhere"; US Transportation Secretary Sean Duffy has compared it to California's high-speed rail troubles. Project leaders stress its ecological urgency: reports say about 41% of documented mountain lion matings since 2002 have been between close relatives.
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