Abstract: A portable tween deck for a barge or the like includes a plurality of panel assemblies supported between a center support and two end supports. Each panel assembly includes a plurality of spaced pipes which are secured to a plurality of transverse collars. Deck plates are welded to the pipes to bridge the space between the pipes and connecting pins are provided for detachably securing the panel assemblies to each other and to the center support. The portable tween deck may be readily assembled and disassembled within a barge or the like to provide, when desired, a tween deck for carrying automobiles or the like.