A new dirt road once again links a hidden historic West Marin enclave to the outside world—and allows its last surviving legal resident, 86-year-old Ed Stiles, to finally go home. 

After rains washed away the route during the fierce winter storms of March 2023, a narrow trail was the only way Mr. Stiles could reach his beloved Druid Heights, a once-lively counterculture community near Muir Woods that was acquired by the National Park Service…