Waldo Grade, Highway grade between Golden Gate Bridge and Marin City, United States.
The Waldo Grade extends 3.6 miles through the hills of Marin County, connecting San Francisco to the North Bay with multiple lanes in each direction.
The construction of Waldo Grade required extensive excavation and the creation of two tunnels, with the initial four-lane roadway opening to traffic in 1937.
William Waldo, a California politician from the 1850s, influenced the naming of both the grade and the adjacent Waldo Point along Richardson Bay.
The route serves as the main connection between San Francisco and Marin County, featuring the Robin Williams Tunnel at its highest elevation point.
Severe storms in January 1982 triggered substantial landslides along the grade, resulting in a complete 24-hour closure and resident evacuations.
Location: California
Official opening: 1937
GPS coordinates: 37.84300,-122.48600
Latest update: March 9, 2025 12:18
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