Each tower has two columns, joined by an elliptically arched crossbeam above traffic height. As described by The Kangaroo Valley Times of April 1896, "These towers will be about high, built on concrete blocks resting on the present sandstone formation, the masonry to towers being . Each pair of towers will be connected by a wall containing an arched doorway high, and as the top sides of the centre walls and heads of towers will be finished with battlement tops, the whole will present the appearance of a structure similar to the famous "Traitor's" gate of the Tower of London...". In section, the towers are formed by a solid mass concrete core and finished with sandstone blocks. They sit on mass concrete which in turn was cast onto excavations to solid sandstone. Immediately below the roller saddle bearings supporting the cables, the mass concrete is surmounted by bedstones composed of the rarely found hard trachyte weighing 3 tonnes and quarried at Mount Gibraltar at Bowral. The cables enter the towers through openings close to the battlement height of the cross wall, and each tower is then topped with an enlarged battlement. The finish of the sandstone is a combination of smooth ashlar battlement details and rock-faced finish on the main column faces. The original design incorporated drainage gratings in the floor of the upper battlements. Extending out from the base of each tower are sandstone parapet walls framing the approaches to the bridge. These are rubble filled, and topped with footpaths, kerbs and drainage grates on each side of the roadway. The parapet walls connect the towers to the cable anchorage structures. These consist of a shaft sunk some 25 ft into sound sandstone. At the bottom of each shaft is an enlarged chamber where riveted steel beams transfer the tensile forces from the cables to upthrust in the sandstone above. At the surface there are cast iron shoulder castings which turn the cables from inclined to vertical. The thrust forces from these are transferred into the sandstone bedrock via further 5 ton trachyte thrust blocks set in concrete. Each anchor pit is surmounted by a small crenelated turret, with an access cover adjacent. This allows access to the bottom of the pit via a full height access ladder. One of the significant construction tasks was the excavation of drainage tunnels for the pit. On the Nowra side, the main