Clough completed the design and construction contract for the Mount Henry Bridge, located in the southwest of Perth. 

The project involved the design of a 688m long, 28.8m wide bridge to accommodate six lanes of traffic, with the provision of pedestrian walkways and cycleways cantilevered from the lower flanges of the superstructure. 
The project construction involved of nine continuous spans of precast double-cell single box post-tensioned concrete segments, supported by sculptured reinforced concrete piers.

The project also involved a 500 tonne steel falsework truss, which was floated into position on barges, was suspended from the end of the previously completed stage of the superstructure to the next pier and cantilevered forward to the end of this stage. The truss was cable stayed for additional support from a 34m high tower on the previous pier. The tower was guyed with back-stay cables that were tightened with hydraulic jacks as the weight of the precast deck was added to the truss.

Clough’s work on the Mt Henry Bridge won the Company the Institution of Engineers of Australia “Western Australian Engineering Award” for 1981.