01 / Stone weir
A gravity-arch stone weir,9 m high and 27.5 m long.

The former Ominato water-source waterworks were built from 1902 to 1910 (Meiji 35 to 43), and the Agency for Cultural Affairs calls them the first modern waterworks built in the Tohoku region. The settling-basin weir is a gravity-arch stone weir 27.5 m long and 9 m high; the Shimokita Geopark site says it was made with rock from Mt. Kamafuse. It became an Important Cultural Property in 2009.
- 27.5 m long, 9 m high
- Built 1902 to 1910
- Important Cultural Property, 2009
