The San Mateo coast during World War II

A World War II observation bunker overlooking Whale Cove (by Devil’s Slide) that never became a restaurant.

After the Japanese bombed Pearl Harbor on Dec. 7, 1941, the San Mateo Coast was very vulnerable to enemy invasion.

Patrols were immediately formed to keep track of any suspicious or military activity that was going on along the coast. There was only one main highway along the coast, so it was used extensively for the movement of military personnel to the different posts that would be established. As these positions would be facing the Pacific Ocean and be concerned with water, the Navy and the Coast Guard were the main departments that guarded the coast, although the U.S. Army’s 56th Coast Artillery pulled four 155 mm portable howitzer guns to the coast and placed them in El Granada. These howitzers would give mobility to the small force that was there at first. Foot and horse patrols on local beaches were directed from a 100-year-old building/pub and inn (Wave Crest Inn) that was on the southern skirts of Half Moon Bay. In the small community of Montara, the post office building was used for the U.S. Army officers’ quarters. South of the Montara Lighthouse, the U.S. Navy established a gunnery school and radio station with a number of station houses and offices. Air Force airplanes would fly a short distance from the shore with targets behind them and artillery fire would be directed from these facilities. In the Moss Beach area, they built a radio station as well as numerous other embedded bunkers.

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