Embodiments of a modular flotation section include a utility trough molded into an upper end of the modular flotation section that extends an entire end-to-end distance of the modular flotation section. The utility trough has an open top end level with a top surface of the modular flotation section, opposing sidewalls that extend downward from the top surface, a closed bottom end, and two opposing open side ends. A depth and width of the utility trough is less than, respectively, a total height and width of the modular flotation section. Electrical cables, water lines, or a combination of the two may be placed within the trough, thereby isolation the cables and lines from the dock frame.