Nakaiwa Dam is a gravity dam located in Tochigi prefecture in Japan.

The dam is used for power production.

The dam impounds about 12 ha of land when full and can store 1488 thousand cubic meters of water.

The construction of the dam was started on 1922 and completed in 1924.

This article about a dam or floodgate in Kantō region of Honshu, Japan is a stub.