the joint advice and approval of Heritage Victoria and the NSW Heritage Office. Bethanga Bridge comprises riveted steel Pratt through trusses on multiple reinforced concrete piers and reinforced concrete "waffle slab" deck on steel beams. There are nine identical principle spans of arched upper cord giving a truss variable depth. This form is also known as "Hog-backed" Camel-back" and "Parker" truss in the USA. There are overhead diagonally braced frames and under deck diagonal "X" bracing between riveted plate cross girder beams. The short approach span on the NSW side has RSJ beams with straight transverse cross-braces. The main truss spans have ten bays with nine vertical compression chords and eight diagonal tension chords. The Murray River boundary between New South Wales and Victoria is on the southern bank of the river. All structures of the river are considered to be in New South Wales. Because of its unique location, over the waters of a dam with the border running down the centre of the body of water, the Bethanga Bridge is the only built structure shared by both New South Wales and Victoria and listed on both the New South Wales State Heritage Register and the Victorian Heritage Database. Condition The road deck was initially timber but was replaced in 1961 with a concrete waffle slab deck. In 1961 the bridge deck and truss structure was also raised by in response to the upgrading of Hume Dam and works to increase the storage capacity of the dam. In 2005 the waffle slab decking was replaced to raise the load capacity, new guard rails were installed and the NSW approach to the bridge was widened for safety reasons. These 2005 works were undertaken with the joint advice and approval of Heritage Victoria and the NSW Heritage Office. The Pratt truss was an American style bridge truss that began the tide of change from British to American bridge technology in the nineteenth century. The Bethanga example comes from a period when Pratt trusses were an established design alternative, favoured by railways but generally shunned in Victorian road bridge design. It is a type of truss in which vertical web members are in compression and diagonal web members in tension. Many possible configurations include pitched, flat, or camelback top chords. It may be recognised by diagonal members which appear to form a "V" shape toward the centre of the truss when viewed