Ever wondered what lies beneath the Presidio Golf Course? Right here before us is the General Douglas MacArthur Tunnel a hidden marvel of San Francisco’s infrastructure.
This isn’t just any tunnel. The General Douglas MacArthur Tunnel formally known as the Presidio Tunnel carries California State Route 1 beneath a significant hill. It also runs under the Presidio Golf Course. This vital artery connects Park Presidio Boulevard to US 101 and the iconic Golden Gate Bridge.
Its story begins long before its 1940 opening. The Golden Gate Bridge opened in 1937. Northbound traffic relied solely on Doyle Drive. A second approach from the south the Funston Avenue approach was initially planned but delayed. By 1938 traffic had doubled creating a desperate need for the Funston Avenue approach. The Army however insisted on a tunnel to avoid disrupting the Presidio’s parade grounds and golf course. General Paul Malone the Army’s commanding officer made this very clear. Lengthy negotiations ensued over the tunnel’s length. The Army wanted a much longer tunnel than the Highway Commission preferred. General Malone’s successor General George Simonds eventually approved plans for a 1300-foot tunnel.
The Macco Construction company the same firm that built the southbound Waldo Grade approach won the construction contract in 1938. Their bid was a mere $593042. This translates to over 12 million dollars today. They used a cut and cover method excavating the route fitting steel arch forms pouring concrete and then refilling the top. This clever method proved cost-effective for the relatively small amount of earth removal involved. To minimize disruption two tees and a green on the golf course were temporarily relocated. A footbridge was even built for golfers. Even more interesting the tunnel length was carefully calculated to avoid the need for forced ventilation reducing carbon monoxide buildup. A mid-tunnel shaft was added for passive ventilation with the capacity for future forced exhaust. The tunnel opened on April 21 1940.
A two day gala celebrated the Funston Avenue approach’s completion. Delegates from across the West Coast Canada and Mexico attended. The tunnel was initially called the Funston Avenue Tunnel and later the Presidio Tunnel. In 1986 it was renamed the General Douglas MacArthur Tunnel honoring the famous general. Today the General Douglas MacArthur Tunnel stands as a testament to engineering ingenuity and a pivotal part of San Francisco’s transportation history. Its existence is a story of compromise negotiation and the enduring need to connect communities. And who knew there was such a captivating story hidden beneath our feet?