Aigawa Dam Aigawa Dam Management Office Seiho-chiuchi, Ibaraki City, Osaka Prefecture Aigawa Dam Management Office from 11:30 AM to 4:30 PM Restroom available at the management office Dam card automatic vending machine in front of the management office, available 24 hours a day, 365 days a year Kaze no Oka Zone: 56 parking spaces (including 2 for disabled users) Aigawa Dam Management Office: 9 parking spaces (including 1 for disabled users) Fee: Free After more than thirty years since the project began in 1988, completion is aimed for 2022 Aigawa Dam in March 2021 Aigawa Dam is a rock-fill dam constructed on the Aigawa River, which is part of the Yodo River system. A rock-fill dam is built by piling up rocks and soil, and its appearance and structure are quite different from that of a concrete gravity dam. Aigawa Dam also has the appearance of stones stacked on a slope. According to the Ministry of Land, Infrastructure, Transport and Tourism, the total project cost for the construction of Aigawa Dam is approximately 131.4 billion yen (verification materials), while other sources estimate it at around 135.6 to 153.6 billion yen.