The 10-lane freeway that slices through this part of Southern California is one of the busiest in the country, ushering more than 300,000 cars across the greater Los Angeles area every day.
For drivers, it’s a nightmare: This stretch of Highway 101 is known as the “highway from hell,” the infamous host of the nation’s worst commutes.
But if the 101 is bothersome for bipeds, it is downright disastrous for the wildlife that also calls the region home. The 101 cuts like a chain saw through a vibrant natural ecosystem of coastal sage scrub and oak trees interspersed with suburban neighborhoods, disrupting the movement of animals and threatening their survival.
Now a massive infrastructure project is underway to suture together the vast tracts of fragmented wildlife habitat that have been separated by the highway for decades. Construction on a key phase of the Wallis Annenberg Wildlife Crossing — a $100 million structure funded by a mix of public and private money — began last month and it is expected to open in early 2026.
The bridge will be the largest of its kind in the world, spanning the highway at roughly the size of a football field, and it will reconnect the undeveloped sections of the Santa Monica Mountains with those of the Simi Hills. The new pathway will be a boon for the rare and struggling species that are trying to subsist amid the sprawl, especially mountain lions, whose local population could perish without it, say the scientists who study the animals.
The crossing has inspired an influx of government and philanthropic investment for similar ventures across the country, and it has become a beacon of cohabitation during an age indelibly shaped by human activity, when many of Earth’s vulnerable species are facing the prospect of extinction propelled by a roadkill epidemic. If a wildlife crossing can work in the cradle of American car culture, proponents say, then it can work anywhere.
“When the number one threat to wildlife worldwide is the loss of habitat, we can’t write these places off,” Beth Pratt, the project’s lead fundraiser and chief spokesperson, said of urban areas like Los Angeles. “Environmentalists like me usually don’t like bulldozers, but this is the world’s most hopeful construction site.”
For drivers, it’s a nightmare: This stretch of Highway 101 is known as the “highway from hell,” the infamous host of the nation’s worst commutes.
But if the 101 is bothersome for bipeds, it is downright disastrous for the wildlife that also calls the region home. The 101 cuts like a chain saw through a vibrant natural ecosystem of coastal sage scrub and oak trees interspersed with suburban neighborhoods, disrupting the movement of animals and threatening their survival.
Now a massive infrastructure project is underway to suture together the vast tracts of fragmented wildlife habitat that have been separated by the highway for decades. Construction on a key phase of the Wallis Annenberg Wildlife Crossing — a $100 million structure funded by a mix of public and private money — began last month and it is expected to open in early 2026.
The bridge will be the largest of its kind in the world, spanning the highway at roughly the size of a football field, and it will reconnect the undeveloped sections of the Santa Monica Mountains with those of the Simi Hills. The new pathway will be a boon for the rare and struggling species that are trying to subsist amid the sprawl, especially mountain lions, whose local population could perish without it, say the scientists who study the animals.
The crossing has inspired an influx of government and philanthropic investment for similar ventures across the country, and it has become a beacon of cohabitation during an age indelibly shaped by human activity, when many of Earth’s vulnerable species are facing the prospect of extinction propelled by a roadkill epidemic. If a wildlife crossing can work in the cradle of American car culture, proponents say, then it can work anywhere.
“When the number one threat to wildlife worldwide is the loss of habitat, we can’t write these places off,” Beth Pratt, the project’s lead fundraiser and chief spokesperson, said of urban areas like Los Angeles. “Environmentalists like me usually don’t like bulldozers, but this is the world’s most hopeful construction site.”
