The Coast Guard used the site as part of the 11th Naval District's Beach Patrol. The Coast Guard patrolled the beaches and inlets along the coast of the 11th Naval District in the vicinity of Newport Beach and Corona Del Mar during World War II. The patrol base was designated as Post S-12 at Balboa (Newport Beach). It is expected that the Coast Guard used existing facilities for administrative, storage, and docking requirements. It is not known if any improvements were constructed by the Coast Guard or Navy during World War II.
On 28 December 1945, following the end of World War II, the Coast Guard ceased to be under the command of the Navy. The Coast Guard remained at the site following World War II and
continues to use the 3.68-acre site for its station. It is not known what improvements, if any, remain from the World War II era, however, all existing improvements are currently in use by the Coast Guard or other entities that use the site, including the Harbor Master/Orange County Sheriff's Department and the California State Parks and Recreation Department.
