The USS Poseidon (ARL-12) was one of 39 Achelous-class

USS Achelous (ARL-1)

USS Achelous was one of 39 tank landing ships converted into landing craft repair ships for service in the United States Navy during World War II. The lead ship in her class, she was named for the Greek god Achelous, the only U.S...

 landing craft

Landing craft

Landing craft are boats and seagoing vessels used to convey a landing force from the sea to the shore during an amphibious assault. Most renowned are those used to storm the beaches of Normandy, the Mediterranean, and many Pacific islands during WWII...

 repair ships built for the United States Navy

United States Navy

The United States Navy is the naval warfare service branch of the United States Armed Forces and one of the seven uniformed services of the United States. The U.S. Navy is the largest in the world; its battle fleet tonnage is greater than that of the next 13 largest navies combined. The U.S...

 during World War II

World War II

World War II, or the Second World War , was a global conflict lasting from 1939 to 1945, involving most of the world's nations—including all of the great powers—eventually forming two opposing military alliances: the Allies and the Axis...

. Named for Poseidon

Poseidon

Poseidon was the god of the sea, and, as "Earth-Shaker," of the earthquakes in Greek mythology. The name of the sea-god Nethuns in Etruscan was adopted in Latin for Neptune in Roman mythology: both were sea gods analogous to Poseidon...

 (the Greek god of the sea), she was the only ship U.S. Naval vessel to bear the name.

Her keel was laid down as LST-1037 by the Boston Navy Yard

Boston Navy Yard

The Boston Navy Yard, originally called the Charlestown Navy Yard and later Boston Naval Shipyard, was one of the oldest shipbuilding facilities in the United States Navy. Established in 1801, it was officially closed as an active naval installation on July 1, 1974, and the property was...

 in Boston, Massachusetts, on 10 July 1944. She was renamed Poseidon and given hull classification symbol

Hull classification symbol

The United States Navy, United States Coast Guard, and United States National Oceanic and Atmospheric Administration use hull classification symbols to identify their ship types and each individual ship within each type...

 ARL-12 on 12 June 1944; launched

Ship naming and launching

The ceremonies involved in naming and launching naval ships are based in traditions thousands of years old.-Methods of launch:There are three principal methods of conveying a new ship from building site to water, only two of which are called "launching." The oldest, most familiar, and most widely...

 on 24 August 1944; sponsored by Mrs. Nora T. Twomey; and placed in reduced commission on 22 September 1944. Following initial commissioning, Poseidon steamed south to Baltimore, Maryland, where she decommissioned and completed conversion to a landing craft repair ship. Commissioned

Ship commissioning

Ship commissioning is the act or ceremony of placing a ship in active service, and may be regarded as a particular application of the general concepts and practices of project commissioning. The term is most commonly applied to the placing of a warship in active duty with its country's military...

 in full 13 February 1945, she completed shakedown in Chesapeake Bay

Chesapeake Bay

The Chesapeake Bay is the largest estuary in the United States. It lies off the Atlantic Ocean, surrounded by Maryland and Virginia. The Chesapeake Bay's drainage basin covers in the District of Columbia and parts of six states: New York, Pennsylvania, Delaware, Maryland, Virginia, and West...

 and, assigned to ServRon 10, sailed for Ulithi

Ulithi

Ulithi is an atoll in the Caroline Islands of the western Pacific Ocean, about 191 km east of Yap. It consists of 40 islets totalling , surrounding a lagoon about long and up to wide—at one of the largest in the world. It is administered by the state of Yap in the Federated States of...

, thence, in early June, to Okinawa. There, at Kerama Retto

Kerama Retto

The are a group of 22 islands located southwest of Okinawa Island in Japan. Four of the islands are inhabited:,., and. The islands are within Shimajiri District. The Kerama-shotō coral reef is a Ramsar Site....

 and at Buckner Bay, she repaired landing and patrol craft until the cessation of hostilities. Ordered back to the United States

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

 after World War II

World War II

World War II, or the Second World War , was a global conflict lasting from 1939 to 1945, involving most of the world's nations—including all of the great powers—eventually forming two opposing military alliances: the Allies and the Axis...

 for inactivation, she decommissioned

Ship decommissioning

To decommission a ship is to terminate her career in service in the armed forces of her nation. A somber occasion, it has little of the elaborate ceremony of ship commissioning, but carries significant tradition....

 on 30 November 1946 and was berthed with the Columbia River Group of the Pacific Reserve Fleet. She remained a unit of that group until struck from the Naval Vessel Register

Naval Vessel Register

The Naval Vessel Register is the official inventory of ships and service craft in custody of or titled by the United States Navy. It contains information on ships and service craft that make up the official inventory of the Navy from the time a vessel is authorized through its life cycle and...

 on 1 July 1961.

She was sold 3 November 1961 to the Marine Power and Equipment Company of Seattle, Washington

Seattle, Washington

Seattle is the county seat of King County, Washington. With 608,660 residents as of the 2010 Census, Seattle is the largest city in the Northwestern United States. The Seattle metropolitan area of about 3.4 million inhabitants is the 15th largest metropolitan area in the country...

. Her final fate is unknown.