The Jinnai-kami-ike Dam (陣内上池ダム) is an earth-fill dam situated in Higashikagawa City, Kagawa Prefecture, Japan. Its primary function is to serve as an irrigation reservoir, supplying water for agricultural purposes in the local area.
Completed in 1969, the dam stands at a height of 18.0 meters (59 feet) and has a crest length of 120.0 meters (394 feet). The reservoir behind the dam boasts a total storage capacity of approximately 227,000 cubic meters (7.9 million cubic feet). As a vital piece of water management infrastructure, Jinnai-kami-ike Dam plays a role in supporting the agricultural economy of Higashikagawa City by ensuring a stable water supply for crop cultivation. It is representative of the numerous smaller dams and irrigation ponds (known as tameike) that are prevalent across Japan, especially in regions with historically challenging water access for farming.