Perched above one of the country's busiest freeways, a massive concrete structure nearly finished its journey from blueprint to reality. California's wildlife crossing, under construction in northern Los Angeles County since 2022, will officially open to animal traffic on December 2, marking the completion of what backers call the world's largest animal passage over a major highway.
The bridge spans a 10-lane freeway carrying 400,000 vehicles daily, designed to provide safe passage for mountain lions, bobcats, and lizards between the Santa Monica Mountains. Its 6,000 native plants, ranging from California poppies to purple sage, now host butterflies and caterpillars, with at least one western fence lizard and a rattlesnake already claiming residence on the structure.
The 114 million dollar project has weathered more than weather. After breaking ground, it encountered two years of record rains and flooding, prompting a schedule revision from a 2025 completion to 2026. More recently, conservative commentators launched a sustained attack on the initiative. The Murdoch-owned California Post published an opinion piece in March characterizing it as a "bridge to nowhere" and a "jobs program for environmentalists." Fox News and former transportation secretary Sean Duffy amplified the criticism.
Beth Pratt, regional executive director of the National Wildlife Federation and the public face of the project, endured the worst of it. She received messages calling her a "moron" and a "cat lady," along with threats of physical violence severe enough to require law enforcement involvement. The organization subsequently hired security and changed operational protocols for staff safety.
The budget increase that fueled the criticism reflects broader construction realities, Pratt argues. The project's cost jumped 23 percent from 93 million to 114 million dollars in spring 2025 when inflation spiked. The Federal Highway Administration's National Highway Construction Cost Index shows a 67 percent overall increase since 2021, making the wildlife crossing's cost growth actually lower than typical highway construction inflation during the same period.
Christopher Rufo, one of the California Post opinion authors, dismissed Pratt's defense, telling the Guardian she seemed "quirky, well-meaning" but unsuited to run a major infrastructure project. He maintained concerns about the schedule delays and budget overruns.
Work remains substantial. Construction crews are building a second large structure to bridge a local road and connect to surrounding hillsides. Summer work will involve hauling in 3 million cubic feet of soil, enough to fill half of SoFi Stadium, followed by noise-blocking berms and wildlife-proof fencing along the freeway. Eventually, the site will feature more than 50 cameras monitoring crossing activity.
Jeff Sikitch with the National Park Service leads a two-year study tracking five target species' movements before and after the crossing opens, providing researchers a rare opportunity to measure the structure's impact on biodiversity. The Santa Monica Mountains harbor critical habitat for these species, including the region's remaining large carnivore population.
Samaniego, who co-managed the native plant nursery where seeds were gathered by hand and grown for the bridge's vegetation, emphasized the care invested in the project. "We really put our heart and soul into each plant that we grew," she said, reflecting on how butterflies and other wildlife had already begun colonizing the plants while construction continued.
Pratt announced the opening date at an Earth Day event this week, visibly emotional. Despite the vitriol and obstacles, the decades-in-the-making project approaches its gateway moment. "If bullies think they're going to stop the work, they don't know me," she said. "I'm from Boston."
Author James Rodriguez: "This bridge deserved the acrimony like a bobcat deserves a traffic ticket, which is to say not at all. The conservative attack on it was predictable culture-war theater masquerading as fiscal responsibility."
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