USS Hyac (SP-216) was a United States Navy patrol vessel in commission from 1917 to 1918.

USS Hyac on 26 November 1917, hauled out of the water on a marine railway, probably for winter lay-up.
History
United States
NameUSS Hyac
NamesakePrevious name retained
BuilderWeckler Boat Company, Chicago, Illinois
Completed1915
Acquired1917
Commissioned5 July 1917
FateReturned to owner 26 November 1918
NotesOperated as civilian motorboat Hyac 1915-1917 and from November 1918
General characteristics
TypePatrol vessel
Displacement48 tons
Length75 ft 4 in (22.96 m)
Beam14 ft 5 in (4.39 m)
Draft5 ft (1.5 m)
Speed10 knots
Hyac on the Great Lakes as a civilian motorboat sometime between 1915 and 1917, prior to her U.S. Navy service. She flies a pennant bearing her name at her bow.

Hyac was built as a civilian motorboat of the same name in 1915 by the Weckler Boat Company at Chicago, Illinois. The U.S. Navy acquired her from her owner, W. M. Derby of Chicago, in 1917 for World War I service as a patrol vessel. She was commissioned as USS Hyac (SP-216) on 5 July 1917.

Based at Chicago and assigned to the "9th, 10th, and 11th Naval Districts"—at the time a single administrative entity made up of the 9th Naval District, 10th Naval District, and 11th Naval District -- Hyac served as a patrol boat on the Great Lakes between Chicago and Sault Ste. Marie, Michigan, during World War I.

Following the end of the war, Hyac was returned to her owner on 26 November 1918.

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