The world's largest wildlife bridge is about to open over one of America's deadliest freeways
In December, the Wallis Annenberg Wildlife Crossing will open over the 101 Freeway in Los Angeles, ten lanes of traffic that have spent decades cutting mountain lions, coyotes, deer, and black bears off from mates and territory on the other side 121.
It started in 2012 with a conversation in Griffith Park between wildlife advocate Beth Pratt and biologist Jeff Sikich, who mentioned, almost in passing, that the local puma population needed a corridor. "I'm like, 'Sure, how hard can it be?'" Pratt recalls. Fourteen years later, it is finally real: a vegetated overpass big enough to feel like a hillside rather than a bridge. The project's unlikely mascot was P-22, the celebrated "loneliest lion in LA," who crossed the 405 as a young cat, built a following roaming the Hollywood Hills, and died in 2022 without ever getting to use the crossing built partly because of him. Wildlife collisions kill hundreds of Americans and hundreds of millions of animals every year and cost billions in damage 121, and this one structure is designed to make a dent in all three numbers at once.