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See Devil's Slide Bunkers, California
Devil's Slide is a coastal promontory in California, United States. It lies on the San Mateo County coast between Pacifica and Montara. Its name comes from the rocky edges prone to accident.
Devil's Slide was the location of a military triangulation station and observation site used during World War II as part of the harbor defense of San Francisco. Prior to the advent of radar, military personnel used binoculars and compasses to search for ships at sea and relay their coordinates to a central post. By combining information from multiple observation posts, a ship's precise location could be determined by triangulation. There were six military structures at the Devil's Slide: three concrete and steel observation pill-boxes, two concrete-and-earth bunkers, and a reinforced steel observation tower. The pill-boxes were used as hardened observation posts, and one of the bunkers was used as a communications and command post. The southernmost bunker site was sold to a private owner in 1983, but some of the exposed structure remains.
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