Historic California Posts, Camps, Stations and Airfields
Harbor Defenses of Los Angeles: Anti-Motor Torpedo Boat Battery Terminal Island
90mm gun on an M3 fixed mount (Coast Defense Study Group)
US Army Corps of Engineers Los Angeles District History (14 February 1990)
The site identified as the former Anti-Motor Torpedo Boat Battery Terminal Island, Harbor Defenses of Los Angeles (HDLA) was located on the Southeast portion of Reservation Point, Terminal Island, six miles Southwest of Long Beach.
The War Department obtained two Use Permits from the Department of the Navy. One contained "no area" and was issued on 2 January 1943 for gun emplacement sites and the other
contained 0.08 of an acre issued on 6 October 1944 for an underground cable right-of-way.

The site was used for two AMTB battery emplacements as part of the harbor defenses of Los Angeles. Construction took place during 1943-1944. In addition to two fixed emplacements mounting 90mm guns om M3 mounts and two temporary sites on portable M1 mounts.

A Declaration of Excess was filed on 25 April 1955 and Letter Permit No. LA-457 (no area) was relinquished to the Department of the Navy on 21 May 1951. The permit dated 6 October 1944 was relinquished to the Department of Navy on 14 May 1956. The property is currently owned by the Los Angeles City Harbor Department.

The property is being used as residential housing for U.S. Coast Guard Base personnel.
Anti-Motor Torpedo Boat Batteries, Harbor Defenses of Los Angeles
by Justin M. Ruhge

In 1942 five batteries of AMTB guns protected the San Pedro Harbor. There were four batteries of 90-mm guns and 37-mm guns and one of only 37-mm guns. These were fast-firing weapons, which were supplemented with 50-caliber machine guns and searchlights as needed. The 90-mm batteries were four guns, two of which were permanent and two mobile. These were supplemented with two mobile 37-mm guns.

These batteries were located at the Gaffey Bulge where Gaffey Street winds around Battery Leary-Merriam; JAAN No. 1, Navy Field; JAAN No. 2, Bluff Park; and Terminal Island.

The fifth battery was designated Dolphins. This was a line of 10 37-mm guns on towers with searchlights located along the harbor breakwater - making a total of 34 guns.

Location of Anti-Motor Torpedo Boat Batteries, July 1944. Click to view a larger image (Coast Defense Study Group)
Location of Anti-Motor Torpedo Boat Searchlights, July 1944. Click to view a larger image (Coast Defense Study Group)
Site Map
Point A is the location of the gun emplacements. Point B is the underground cable right of way.
Report of Complete Works - Seacost Fortifications
Source: Coast Defense Studty Group
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Updated 23 June 2017