An Iris class vessel, she was built by Marine Ironworks and Shipbuilding Corporation in Duluth, Minnesota.

After changing hands several times, she ended up being transferred to the Northeastern Maritime Historical Foundation, who evaluated her and determined their best use of the ship was to sell her, or parts of her, to raise money to support their other projects.

Spar's main engines, generators, and other equipment were removed and sold to re-power another vessel.

The hull was prepared and sunk in June 2004 in 100 feet of water, 30 miles (48 km) off Morehead City, North Carolina, where she now serves as an artificial reef.

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