Koyama Dam
| Orderer | Ibaraki Prefecture |
|---|---|
| Completion | 2005 |
| Structure and scale | Gravity concrete dam, dam height: 65m; crest length: 462m; dam voltage: 531,000m³; reservoir water volume: 16,600,000m³ |
| Location | Ibaraki Prefecture |
| Application | Multi-purpose dam |
Koyama Dam was completed in 2006, and is the newest dam in Ibaraki Prefecture. It is also the largest dam in Ibaraki Prefecture. (As of 2018)