| Ainumanai Dam | |
| Location: | Hokkaido Prefecture, Japan |
| Dam Length: | 90.9m |
| Dam Height: | 25.3m |
| Opening: | 1930 |
| Res Capacity Total: | 758 thousand cubic meters |
| Res Catchment: | 22.1 sq. km |
| Res Surface: | 27 hectares |
| Coordinates: | 42.1006°N 140.1339°W |
| Location Map: | Japan |
Ainumanai Dam is a gravity dam located in Hokkaido Prefecture in Japan. The dam is used for power production. The catchment area of the dam is 22.1 km2. The dam impounds about 27 ha of land when full and can store 758 thousand cubic meters of water. The construction of the dam was completed in 1930.[1]