| Unbong Dam/Yunfeng Dam | |
| Name Official: | 운봉댐,운봉수력발전소,云峰水电站 |
| Location Map: | China |
| Coordinates: | 41.3808°N 126.5144°W |
| Country: | China/North Korea |
| Location: | Ji'an/Chasŏng |
| Status: | O |
| Construction Began: | 1959 |
| Opening: | 1965 |
| Dam Type: | Concrete gravity |
| Dam Height: | 113.750NaN0 |
| Dam Length: | 8280NaN0 |
| Dam Elevation Crest: | 321.750NaN0 |
| Dam Crosses: | Yalu River |
| Spillway Type: | Overflow, 21 gates |
| Spillway Capacity: | 219000NaN0 |
| Res Capacity Total: | 3895000000m2 |
| Res Capacity Active: | 2662000000m2 |
| Res Catchment: | 175720NaN0 |
| Res Elevation: | 318.750NaN0 |
| Plant Hydraulic Head: | 890NaN0 (design) |
| Plant Commission: | 1965-67 |
| Plant Turbines: | 4 x 100 MW Francis-type |
| Plant Capacity: | 400 MW |
The Unbong Dam, or Yunfeng Dam, is a concrete gravity dam on the Yalu River which borders China and North Korea. It is located 330NaN0 northeast of Ji'an in Jilin Province, China and Chasŏng in Chagang Province, North Korea. The primary purpose of the dam is hydroelectric power generation and it supports a 400 MW power station. Construction of the dam had initially began in August 1942 but was halted in 1945 after the surrender of Japan ending World War II.[1] In October 1959, construction on the dam recommenced and in September 1965, the first of the four 100 MW Francis turbine-generators was operational. The last generator was operational on 4 April 1967. The 113.750NaN0 tall dam creates a reservoir with a storage capacity of 3895000000m2. The dam's spillway is an overflow type with 21 floodgates and has a maximum discharge of 219000NaN0. The dam is located before a bend in the river and its power station is located on the other side of a ridge that meets the dam's right abutment. Water is delivered to the power station via two tunnels, 7750NaN0 and 7590NaN0 long. Generators 1 and 3 deliver power to China while 2 and 4 deliver to North Korea.[2] [3]