Clough (FKA J O Clough and Son Pty. Ltd.), in joint venture with Christiani & Nielsen A.S. of Denmark, completed the construction of a five span continuous prestressed concrete bridge crossing the Swan River in Perth. 

The bridge was comprised of five spans with an approximate length of 335 metres overall (comprising a centre span of 97.6m, two flanking of 70m, and two of 48.8m). The superstructure consists of eight rows of I beams, made up of precast segments 2.97m long and of varying depth, weighing up to 20 tonnes each.

The bridge was post-tensioned longitudinally using the Gifford Udall stressing system, employing 19 wire 17.5mm diameter strand system, developed specifically for the project.

The bridge was completed in September 1959 and officially opened by the Governor, Sir Charles Gairdner on 13 November 1959. At the time of its opening, the Narrows Bridge was the largest precast prestressed continuous beam bridge in Australia.