USS Niagara (SP-263)
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| Career | |
| Class: | Misc. Class Patrol Gunboat |
| Launched: | 1915 as the civilian boat Niagara |
| Commissioned: | 1 May 1917 (as Patrol Gunboat Niagara (SP-263): refitted and rechristened in 1919 as USLHT Poinsettia |
| Fate: | Sunk 27 December 1928 |
| General characteristics | |
| Length: | 50 ft (15 m) maximum |
| Beam: | 15 ft (5 m) |
| Draught: | 2.67 ft (0.8 m) |
| Displacement: | 50 tons |
USS Niagara (SP-263) was a vessel of the United States Navy during World War I.
Niagara was built in 1915 as the civilian ship Niagara. In 1917 she was taken into naval service as a section patrol boat and was renamed USS Niagara (SP-263). The navy redesignated the boat as SP-263 on April 11, 1918, dropping the name Niagara.
After the war, she was transferred to the United States Coast Guard on May 29, 1919, converted into a lighthouse ship and rechristened USLHT Poinsettia.
She was assigned to the 7th Lighthouse District in Key West, Florida. She caught fire and sank on December 27, 1928.
See USS Niagara for other ships of this name.

