Guide
Honemonike Dam (Honemonike Entei) is located in Onohara-cho, Kanonji City, Kagawa Prefecture. It is the oldest existing stone-masonry multiple-arch dam in Japan. Due to its unique shape, it possesses a majestic presence reminiscent of a medieval European castle, harmonizing beautifully with the surrounding natural landscape. Designated as a National Important Cultural Property (Structure), it is a precious site that tells the history of Japan's modern civil engineering. The area is developed as the "Honemonike Reservoir Park," allowing visitors to enjoy peaceful strolls while immersing themselves in history and nature.
This dam represents a significant technical achievement from the Taisho to early Showa eras. Construction began in 1926 (Taisho 15) and was completed in 1930 (Showa 5). The project was a massive community effort, involving approximately 150,000 people, primarily driven by local cooperatives. The name "Honemonike" was bestowed by Minister of Finance Chuzo Mido during his inspection of the site in 1929. The structure features a multiple-arch design with five arches and six buttresses, reflecting the advanced American engineering philosophies of that era. In 2006, its immense historical value was officially recognized with its designation as an Important Cultural Property.
The greatest attraction is the aesthetic beauty of the dam's unique arch structure. The fusion of concrete and stone masonry creates a heavy, dignified atmosphere that sets it apart from standard modern dams. A major highlight is the water discharge seen during specific seasons. Particularly during the "Yurunuki" event held from mid-to-late July, you can witness the overwhelming power of water cascading from a height of 30 meters. Within the surrounding park, visitors can also enjoy the seasonal flora and the serene scenery of the lakeside.
The best time to visit is July, when the dynamic water discharge occurs. This is a rare opportunity to experience the raw power of the water alongside the historical beauty of the dam, providing a refreshing escape from the summer heat. The lush greenery of summer enhances the scenic beauty of the waterfront. For photography, daytime hours are ideal, as bright natural light allows for the clearest observation of the intricate stone masonry and the dam's structural details.
At the adjacent Honemonike Reservoir Park, visitors can enjoy walking through nature. It is a perfect spot for a relaxing stroll while admiring the historic architecture or practicing landscape photography. The water discharge period offers a particularly high-energy experience. Additionally, the surrounding area is a thriving agricultural zone, allowing you to observe the unique landscape where traditional Japanese rural scenery meets the monumental dam structure.
The area around the dam features the scenic landscapes of Onohara, characterized by rich nature and intensive agriculture. Depending on the season, you can enjoy beautiful views of the rice paddies. The dam is also conveniently located for access to other sightseeing spots in Kanonji City and the beautiful Seto Inland Sea coastline, making it an excellent destination for road trips or scenic drives.
While the area is developed as a park, it is a natural environment, so we recommend wearing comfortable walking shoes. If visiting during the summer or during water discharge events, please bring a hat and plenty of water to stay hydrated. As this is a National Important Cultural Property, please do not enter restricted areas or touch the historical structures. Respect the site by taking your trash home with you.