A pre-cast article of manufacture and system, a deck and dock is disclosed utilizing 2 main components, beam(s) and slab(s). Only one component, the cantilever beam, is required for the invention. The preferred embodiment uses a cantilevered Z beam and other embodiments use a drop-cantilever beam and straight-cantilever beam. The cantilever beam may be any shape or size. Optional accessories are also disclosed that may be added such as hand rail(s), boat bumper(s) and water access ladder(s).