A dock assembly is made of floats and deck supports on top of the floats. The floats have upwardly opening channels in which utility conduits may be laid from above before the channels are closed by the deck supports. Whalers attached to the sides of the floats and deck supports connect adjacent floats to each other. Decking may be attached to the deck supports. Rods extending from side to side hold the whalers in place and fasten the deck supports to the floats.