bulkhead—A structure of wood, stone, or concrete erected along shores of water bodies to arrest wave action or along steep embankments to control erosion. Also, a partition wall or structure in a mine.

bulkhead line— A line in a harbor or navigable waters defining the channelward limit of solid fills or bulkheads.  Such lines are usually established by the Secretary of the Defense Department; however, state or municipal authorities under their police powers may establish bulkhead lines shoreward of those established by the Secretary of Defense.

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Source: NSPS “Definitions of Surveying and Related Terms“, used with permission.

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