Yachi River Bridge, Cable-stayed bridge in Qingzhen, Guizhou Province, China

The Yachi River Bridge is a cable-stayed bridge on the Qianxi Expressway, crossing the Yachi River between Qianxi County in Bijie and Qingzhen in Guiyang. Its main span of 800 m is carried by two H-shaped towers, 258.2 m on the north bank and 243.2 m on the south bank, with a steel truss girder in the central span and prestressed concrete box girders on the side spans. The deck is 27.9 m wide and the bridge is 1,461 m long.

The bridge was built as the controlling project of the Guiyang–Qianxi section of the Xiamen–Chengdu Expressway, at a total investment of 780 million yuan. It opened to traffic on 16 July 2016, after construction that the sources date to the early 2010s. Its 800 m steel truss main span made it the longest of its kind for a cable-stayed bridge and the longest main span of any cable-stayed bridge in a mountainous area.

The bridge's name comes from the Yachi River it crosses, a tributary of the Wu River in Guizhou. Its 800 m main span made it the world's longest steel truss cable-stayed span and the longest cable-stayed span in a mountainous area, a point local road authorities cite when describing the Qianxi Expressway. The H-shaped towers carry two planes of cables, and the deck sits about 300 m above the water of the Dongfeng Dam reservoir.

The structure carries the Qianxi Expressway across the Yachi River and connects Qianxi County in Bijie with Qingzhen in Guiyang, reducing travel time and improving regional logistics.

The deck sits about 306 m above the Dongfeng Dam reservoir, not the 440 m often quoted for the bridge; the difference comes from the water level behind the dam. Its 800 m main span is the longest of any steel truss cable-stayed bridge and the longest among cable-stayed bridges in mountainous terrain.