The members of the chord at the bottom of the bridge were flat bars, not I-beams, each bar measuring . Where a member of the chord ended at an angle block, a lug was forged at the base of the bar. This lug fit into a slot in the angle block. The angle blocks which made up the chord at the bottom of the bridge also had lugs facing inward, to which were attached (by means MacDonald did not describe) the lateral braces.