| Kanna Dam | |
| Name Official: | 漢那ダム |
| Coordinates: | 26.4822°N 127.9494°W |
| Country: | Japan |
| Location: | Ginoza, Okinawa |
| Status: | O |
| Construction Began: | 1982 |
| Opening: | 1992[1] |
| Dam Type: | Concrete gravity |
| Dam Height: | 450NaN0 |
| Dam Length: | 1850NaN0 |
| Dam Volume: | 720000NaN0 |
| Dam Elevation Crest: | 330NaN0 |
| Dam Crosses: | Kanna River |
| Res Capacity Total: | 82000000NaN0 |
| Res Capacity Active: | 78000000NaN0 |
| Res Catchment: | 80NaN0 |
| Res Surface: | 10NaN0[2] |
The is a concrete gravity dam on the Kanna River in Ginoza, Okinawa Prefecture, Japan. The purpose of the dam is water supply and flood control. After studies were carried out in the 1970s(starting in 1973 and ending in 1978), construction on the dam began in 1982 and it was completed in 1992.[1] The dam is 450NaN0 tall and 1850NaN0 long. In order to retain the reservoir, a 370NaN0 tall and 5000NaN0 long saddle dam was constructed directly northeast of the dam.[2] A fish ladder was installed on the dam during construction to assist the migration of fish, shrimp and crabs. Mangroves downstream of the dam were restored after construction and the area is a tourist destination along with a habitat for water fowl.[3]