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California builds record-setting wildlife overpass to protect animals and drivers

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Oliver Hayes

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California is moving ahead with a major wildlife overpass across the US‑101 near Los Angeles, a project intended to reconnect fragmented habitat and reduce deadly encounters between cars and animals. Entering its final design phase, the Liberty Canyon crossing is pitched as a lifeline for local species — especially the region’s isolated mountain lions — and is set to cost roughly $87 million.

The structure, officially known as the Liberty Canyon Wildlife Crossing, is planned where the freeway slices through the Santa Monica Mountains, at about the 33‑mile marker. Designed to span ten lanes of traffic, the overpass will be extensively planted to imitate native vegetation and dampen highway noise and lights, creating a corridor animals can use without being exposed to heavy traffic.

Project specifications released by planners describe a broad, planted span roughly 165 feet wide and about 200 feet long, with an additional elevated section above nearby Agoura Road. Officials say the aim is to make the crossing look and function like a continuous piece of habitat rather than an engineered bridge.

Why this matters now: populations of mountain lions and other species in the Santa Monica Mountains are effectively boxed in by roads and suburbs. Conservation advocates and park scientists warn that isolation can lead to low genetic variation and higher risks of disease and reproductive problems — outcomes that an ecological bridge is intended to reverse.

The campaign behind the effort points to decades of monitoring by the National Park Service, which began studies in the early 2000s into how roads and development affect wildlife movement. Those findings have been central to arguments for a crossing: reconnecting separated groups allows for natural migration and breeding, which strengthens long‑term population resilience.

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Beyond mountain lions, the crossing is expected to benefit a range of species that roam the regional landscape but are currently hemmed in by the freeway, including coyotes and deer. Proponents also note potential public safety benefits: fewer large animals on a busy freeway should mean fewer serious vehicle collisions.

  • Location: US‑101 at the 33‑mile marker, Liberty Canyon (near Agoura Hills)

  • Size: approximately 165 feet wide by 200 feet long

  • Traffic crossed: ten lanes of highway

  • Estimated cost: about $87 million (roughly €78.1 million)

  • Target species: mountain lions, coyotes, deer and other native fauna

  • Design features: native vegetation, noise and light mitigation, roadway extension above Agoura Road

Environmental groups have framed the crossing as urgent. They point to genetic studies that show the mountain lions in this region have unusually low diversity compared with most mainland populations, a situation that conservationists say increases the likelihood of long‑term decline unless animals can move between larger ranges.

At the same time, officials emphasize that the project remains complex: it requires careful final designs, coordination with transportation agencies, and a large funding commitment. Entering the final design phase is a major milestone, but it does not yet mean construction is complete or community concerns are fully resolved.

If built as envisioned, the Liberty Canyon Wildlife Crossing could become one of the largest engineered wildlife crossings in the United States and a test case for how urbanized regions can restore connectivity for large mammals without compromising transportation needs. For residents and commuters, the most immediate effects would likely be improved road safety and, over time, healthier local wildlife populations.

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