Located within the Wolong Lake, extends from the Huxin Island on the east lakeshore to the West Malian River's lake inlet. It is about 7.88km long. The embankment divides the Wolong Lake into two functional areas, the southern area and the northern area, and control the southern water level by 3 connection valves. The northern part of the lake has become a deep water area, which is used for flood control, water storage, fishery and sightseeing . The southern area will become wetlands, to restore the biodiversity, and provide suitable habitats for birds.
As one of the limits of the protected zone, the dam is the passage of birds between marsh and other parts of the lake. This dam should not be opened to public, and only authorized maintenance agents of the park can use it.