There are two rivers around Sha River and Hugong River of Gongchuan Ancient Town, one is from south to north, the other one is from west to east. They are meeting at the south gate of Gongchuan. At the end of Hugong River, there is building an ancient bridge that are connected with Gong Fort and Wu Gorge. When it is the rainy season, the river water of Hugong River is muddy, but Sha River is clear.

The length of the bridge is 41m, width is 7m and the deck is 8.1m high. There are wooden houses on the bridge that form gallery type walkway. There are eleven bridge houses and fifty-six stakes. And both ends of the bridge have gatehouses and the middle part has bridge pavilion. Th bridge pavilion is single eaves gable and hip roof.