Specifications: Displacement 2,690 t.; Length 282'; Beam 43'; Draft 17'; Speed 12 kts.; Complement 195; Armament four 4", two machine guns and one "Y" gun.

Click On Image For Full Size Image	Size	Image Description		Source
Steam Yacht Niagara
	111k	.		Jim Rogers
	53k	Photograph taken prior to her World War I Navy service. It is printed on a postal card. U.S. Navy photo NH 102908		Naval Historical Center
USS Niagara (PY 9)
	89k	At anchor, circa 1920, probably in Guantanamo Bay, Cuba. Collection of Gustave Maurer, ex-Chief Photographer, 1921. U.S. Navy photo NH 2232		Naval Historical Center
	73k	In Guantanamo Bay, Cuba, circa 1920. Two battleships are in the background. Collection of Gustave Maurer, ex-Chief Photographer, 1921. U.S. Navy photo NH 44823		Naval Historical Center
	94k	At anchor, probably while assigned to surveying duty during the 1920s. U.S. Navy photo NH 1094		Naval Historical Center
	92k	In port, during the early 1920s. Collection of Captain Frederick R. Naile, USN. U.S. Navy photo NH 102937		Naval Historical Center
	70k	In a Caribbean-area port while on surveying duty, circa the 1920s. Courtesy of Donald M. McPherson, 1969. U.S. Navy photo NH 68340		Naval Historical Center
	94k	At the Philadelphia Navy Yard, Pennsylvania, circa 1931-1933, while being stripped for sale. Courtesy of the Philadelphia "Inquirer," 1936. U.S. Navy photo NH 46458		Naval Historical Center
	106k	Sailor working on the ship's eagle figurehead, while she was being stripped for sale at the Philadelphia Navy Yard, Pennsylvania, circa 1931-1933. Courtesy of the Philadelphia "Inquirer," 1936. U.S. Navy photo NH 46460		Naval Historical Center

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Niagara departed New York 21 May as escort for a merchant convoy bound for Bermuda and the Azores. She arrived at Ponta Delgada, Azores, 12 August and departed 10 days later to join the American Patrol Detachment at Grassy Bay, Bermuda. On 5 September she stood out of the latter port to rescue and tow in the merchant sloop Gauntlet adrift after her sails had been carried away in a storm. On 14 September the patrol yacht sailed for Martinique, West Indies, to escort the French cable ship Pouyer Quertier, arriving Fort-de-France on the 19th. The two ships operated in the West Indies, visiting Trinidad, Barbados, Martinique, and Puerto Rico, until Niagara stood out from Port of Spain, Trinidad, 13 December for Charleston, S.C. She entered the New York Navy Yard 13 May 1919 for repairs before training out of New London and New York.

Niagara departed New York 25 September for Key West, then cruised off the coast of Mexico and between ports in Texas, Louisiana, and Florida. Other missions took her off Honduras, Guatemala, and Cuba. Reclassified PY-9 on 17 July 1920, she continued patrols in the Caribbean Sea as a unit of the special service squadron until decommissioning at Philadelphia 21 April 1922.

Niagara recommissioned 24 June 1924, Comdr. Paul P. Blackburn in command. She sailed 3 November to survey in the Caribbean under the direction of the Navy Hydrographic Office. She operated most of the next 8 years charting the Gulf of Venezuela and the coast of Central America.

Her last survey cruise ended when she returned to Philadelphia 17 October 1930. Niagara decommissioned 3 March 1931; and her name was struck from the Navy List 10 December 1931. She was sold for scrapping 13 September 1933 to the Northern Metal Co., Philadelphia, Pa.