Three Gorges Dam

located in China.
Height of 185 meters
Length of 2,309 thousand meters

The cost of project is 25 billion dollars. During the building of the largest in the world dam perished more than 100 people, 1,3 mln. people were resettled from the subsequently flooded territories. For building of weir left 27 mln. cubic meters of concrete.

wikipedia

The Three Gorges Dam (simplified Chinese: 长江三峡大坝; traditional Chinese: 長江三峽大壩; pinyin: Chángjiāng Sānxiá Dà Bà) is a hydroelectric river dam that spans the Yangtze River in Sandouping, Yichang, Hubei, China. It is the largest hydro-electric power station in the world. Except the ship lift, all the original plan of the project was completed on Oct. 30, 2008, when the 26th generator was brought to commerical operation.^[1] Six additional generators in the underground power plant are being installed, with the dam thus not expected to become fully operational until about 2012. The total electric generating capacity of the dam will reach 22,500 MW.^[2]

As with many dams, there is a debate over costs and benefits. Although there are economic benefits such as flood control, clean hydroelectricity and navigation, there are also concerns about the relocation of people, siltation, loss of archaeological and cultural sites and the impact on regional ecosystem.^[3]