The USS Emerald (SP-177) was a steam yacht constructed in 1906 by Pusey and Jones in Wilmington, Delaware. Originally named Emrose, she was built for A. W. Rose of New York City. Subsequently, the vessel became the property of Maxwell Wyeth of Philadelphia, Pennsylvania, and was renamed Emerald. The yacht featured a steam-powered propulsion system typical of luxury yachts of the early 20th century, though specific dimensions and technical specifications are not provided in the available source. In July 1917, during World War I, the U.S. Navy acquired the vessel from Wyeth for naval service. She was placed into service on July 23, 1917, designated as USS Emerald (SP-177). The exact nature of her commissioning status remains uncertain, with sources differing on whether she was officially commissioned or served in a non-commissioned patrol capacity. As a patrol vessel, Emerald was assigned to the 4th Naval District, which covers the Delaware Bay area. Emerald's primary role during her naval service was harbor entrance patrol duty within Delaware Bay, where she contributed to maritime security efforts during the war. Her duties likely involved monitoring for enemy submarines, thwarting potential sabotage, and ensuring the safety of vital shipping lanes and harbor facilities. Her service was relatively brief, ending in December 1918, shortly after the conclusion of World War I, when she was decommissioned and returned to her previous owner, Maxwell Wyeth. The USS Emerald (SP-177) exemplifies the common practice of the U.S. Navy repurposing private yachts for wartime patrol duties, leveraging their speed and maneuverability in coastal and harbor defense operations. Her service, though not marked by notable battles, contributed to the broader maritime security efforts of the United States during a critical period in naval history.

This description has been generated using GPT-4.1-NANO based on the Vessel's wikidata information and then modified by ShipIndex.org staff.