The Tuoshan Dam, at the foot of Tuoshan Mountain of Yinjiang Town, Yinxian County, is listed as one of the four largest irrigation projects of ancient China (the other three are: the Zhengguo Canal, the Lingqu Canal, and the Dujiang Dam) and now it is a key national project for cultural relics preservation. Originally built in the Tang (833 DC), the Dam is 134.4 m in length, 4.8 m in width, and 4.8 m in height. The top of the Dam is paved with cubes of stone and the body of the Dam is made of wood and stone. There in the Dam was found a huge trunk of plum-wood, still solid after over one thousand years, and it is called “the backbone of the Tuoshan Dam.”

In the history of ancient China’s irrigation construction, the Tuoshan Dam created several miracles in its body’s gradient, its structure of macadam and clay, its layout of the body and its use of multistage protection and ditch check systems. Of these technologies, the first two were used for the first time in ancient China’s dam building and over 200 years than before than other countries. After more than 1160 years of use, the Dam is still in good condition and plays its functions of blocking salt, storing water and draining flood.

Other relics around the Tuoshan Dam are Huisha (Sand Drainage) Sluice Gate， the dipstick, the Tuoshan Temple and the tablet “Fragrant Stone.”