Nanutarra Bridge No. 878 is located on the North West Coastal Highway over the Ashburton River, in the Pilbara region of Western Australia, and is owned and controlled by MRWA. The bridge consists of 10 equal spans of 24.4m, with steel I-beams made continuous by bolted splice joints supporting a composite reinforced concrete deck slab. The substructure comprises RC wall-type piers founded on spread footings on rock.

A detailed inspection of all structural elements was carried out to assess the structural integrity, safety, performance and current condition of the bridge and to make recommendations for a future management strategy.

A review of previous reports was also undertaken. The MRWA underbridge inspection unit was utilised to gain access to all parts of the bridge. Cracks to the underside of the deck slab were mapped and photographed.