| Longjiang Dam | |
| Location Map: | China |
| Coordinates: | 24.2404°N 98.1112°W |
| Country: | China |
| Location: | Mangshi, Dehong Prefecture, Yunnan Province |
| Purpose: | Power, flood control, irrigation |
| Status: | O |
| Construction Began: | 2006 |
| Dam Crosses: | Long River |
| Dam Length: | 472m (1,549feet) |
| Dam Height: | 110m (360feet) |
| Dam Elevation Crest: | 875m (2,871feet) |
| Dam Width Base: | 23.76m (77.95feet) |
| Res Capacity Total: | 1217000000m2 |
| Res Elevation: | 872m (2,861feet) |
| Plant Name: | Longjiang Hydropower Plant |
| Plant Commission: | 2010 |
| Plant Type: | Conventional |
| Plant Turbines: | 3 x 80 MW Francis-type |
| Plant Capacity: | 240 MW |
The Longjiang Dam is an arch dam on the Long River (upper of Shweli River) near Mangshi in Dehong Prefecture of Yunnan Province, China. It is a multiple-purpose project aimed at flood control, irrigation and hydroelectric power generation. Its reservoir has a storage capacity of 1217000000m2, of which 679000000m2 is reserved for river these purposes. The dam's power station is located on its left bank and contains three 80 MW Francis turbine-generators for a total installed capacity if 240 MW.[1] [2] Construction on the project began on 28 November 2006 and all generators were commissioned in 2010.[3]