Welcome to the Roadscapes Wednesday segment! Each week here on Geek Alabama, Roadscapes Wednesday will feature roads and infrastructure related topics. Geek Alabama Editor / Publisher Nathan Young is often called the “road geek” for a good reason, Nathan loves roads and loves talking about roads!
On the eastern edge of Oakland, California, Highway 24 runs straight into the Berkeley Hills—and disappears.
Today, four separate tunnel bores carry roughly 65 million vehicles a year through this mountain. But the Caldecott Tunnel was never built as one enormous project. It evolved over more than a century as traffic increased, engineering changed, and each generation discovered something new about the mountain they were trying to cross.
The story begins with a narrow timber-supported tunnel opened in 1903, continues through the construction of the twin Broadway Low Level Tunnels in the 1930s, the addition of a third bore in the 1960s, and finally the modern fourth bore that opened in 2013.
Along the way, engineers faced fractured geology, cave-ins, construction disputes, rapidly increasing traffic, ventilation challenges, and the devastating 1982 Caldecott Tunnel fire—an event that helped reshape how highway tunnels would approach emergency safety.
Four tunnels. Four generations of engineering. One mountain that kept demanding a better solution.
This is the Caldecott Tunnel.
Categories: Roadscapes Stuff
