Spar deck

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Same as the upper deck.
Sometimes a light deck fitted over the upper deck.
(Naut.) the upper deck of a vessel; especially, in a frigate, the deck which is continued in a straight line from the quarter-deck to the forecastle, and on which spare spars are usually placed. See under Deck.

See also: Deck, Deck, Spar

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
This restoration replaced the spar deck to reintroduce the camber and curve into her top deck and to restore her upper sides to her 1812 appearance.
The major work planned is the replacement of the spar deck, or "top deck," of the ship.
As you wander the open spar deck, workers pull copper pins that might date to the 18th century; nearby, huge hull planks are steamed and bent to match the tuck in the frigate's stern.