Chongqing Daning River Bridge, located on the part of the Hongzhou Lanzhou Highway (a national key highway) between Chongqing’s Wushan and Fengjie, spans the Daning River. Its main bridge is a steel truss deck arch bridge with its net span being 400 metres, which ranks second in the world and first in China among steel truss deck bridges. The main arch rib adopts three-piece equal height truss structure, and the truss height is 10 metres. The upper and lower chord members of the truss adopt box-shape sections; the upper and lower cross bracings adopt I-shape sections. The works total 12,725 tons.