Hanbara, Aikawa, Aiko District, Kanagawa 243-0307
- www.miyagase.or.jp (Japanese)
This dam is situated in the northwestern part of the prefecture, near Higashitanzawa and is the largest gravitational concrete dam in the Greater Tokyo Area. There is a 6 minute long release of water from April through November, every Wednesday, the second and fourth Friday of the month, and every second Sunday of the month. It is done at 11 o'clock and 2 o'clock past noon.