| Heisei Ozeki Dam | |
| Dam Crosses: | Yamakuni River |
| Location: | Kōge, Fukuoka, Japan Nakatsu, Ōita, Japan |
| Dam Length: | 218m (715feet), mobile barrage 166m (545feet) |
| Dam Height: | 3.15m (10.33feet) |
| Construction Began: | 1983 |
| Opening: | 1990 |
| Res Capacity Total: | 52000m2 |
| Res Catchment: | 521km3[1] |
| Res Surface: | 15ha |
also translated without the redundancy as Heisei-ōzeki (Heisei Great Weir or Barrage) is a mobile barrage dam on the Yamakuni River between Kōge, Fukuoka Prefecture and Nakatsu, Ōita Prefecture in Japan.[2] It was constructed in phases for flood control and water supply purposes and fully completed in 1991.[3]