A walkway system comprising a plurality of support assemblies, each having a pair of spaced apart beam support plates on an upper side thereof, and a plurality of pairs of beams. Each pair of beams is supported by pairs of spaced apart beam support plates of at least two support assemblies. A plurality of cross members extend between lower portions of the pairs of beams. The cross members are configured to support one or more cables resting thereupon. A plurality of decking members extend between the pairs of beams. The decking members are secured to upper sides of the beams. The cross members, beams and decking members cooperate to form a partial enclosure for the cables, thereby eliminating the need for a separate cable tray.