The bridge carries one traffic lane in each direction and a footpath on each side. It underwent reinforcing repairs in 1938 when cracks were discovered in the Vierendeel frames of the approach areas of the bridge. The remedy was to erect two steel trusses on the deck to support the damaged area. The octagonal openings were filled in and are no longer a feature of the bridge. These repairs cost £21,800. After this point a weight limit was imposed on traffic using the bridge; even during the Second World War the large trucks used by the US Forces stationed in the camp located in the Domain were not allowed to drive over Grafton Bridge. Further reinforcing was carried out in 1957.