It has two timber truss spans, each of . There is a single timber approach span at one end and none at the other giving the bridge an overall length of . The super structure is supported by timber trestles and provides a single-lane carriage way with a minimum width of . The guard rail is of timber post and rail construction and extends the full length of the bridge. The bridge was reported to be in good condition as at 15 June 2005. Completed in 1898, the Vacy bridge is an early example of an Allan type timber truss road bridge, and in 1998 was in good condition. As a timber truss road bridge, it has many associational links with important historical events, trends, and people, including the expansion of the road network and economic activity throughout NSW, and Percy Allan, the designer of this type of truss. Allan trusses were third in the five-stage design evolution of NSW timber truss bridges, and were a major improvement over the McDonald trusses which preceded them. Allan trusses were 20% cheaper to build than McDonald trusses, could carry 50% more load, and were easier to maintain. The Vacy bridge is located in the Hunter Region, which has 15 historic bridges each constructed before 1905, and it gains heritage significance from its proximity to the high concentration of other historic bridges in the area. In 1998 there were 38 surviving Allan trusses in NSW of the 105 built, and 82 timber truss road bridges survive from the over 400 built. The Vacy bridge is a representative example of Allan timber truss road bridges, and is assessed as being State significant, primarily on the basis of its technical and historical significance. The Vacy Bridge over Paterson River was listed on the New South Wales State Heritage Register on 20 June 2000 having satisfied the following criteria. The place is important in demonstrating the course, or pattern, of cultural or natural history in New South Wales. Through the bridge's association with the expansion of the NSW road network, its ability to demonstrate historically important concepts such as the gradual acceptance of NSW people of American design ideas, and its association with Percy Allan, it has historical significance. The place is important in demonstrating aesthetic characteristics and/or a high degree of creative or technical achievement in New South Wales. The bridge exhibits the technical excellence of its design, as all of the structural detail is clearly visible. In the context of its landscape it is visually attractive. As such, the bridge has a small amount of aesthetic significance. The place has a strong or special association with a particular community or cultural group in New South Wales for social, cultural or spiritual reasons.