Minamiaiki Dam

The Minamiaiki Dam is a concrete gravity dam located on the Minamiaiki River in Minamiaiki Village, Nagano Prefecture, Japan. Completed in 1969, the dam was constructed primarily for flood control and hydroelectric power generation. Standing at 70 meters in height with a crest length of 260 meters, it creates the Minamiaiki Reservoir, which has become an integral part of the region's water management infrastructure. The dam was built by the Japan Water Agency as part of broader development efforts in the Chikuma River system.

The surrounding area offers visitors a tranquil escape into the Japanese Alps, with the reservoir providing scenic views throughout the changing seasons. The dam site is particularly attractive during autumn when the mountainous landscape displays vibrant foliage reflected in the calm reservoir waters. Cherry blossoms in spring also draw visitors to the area. The region around Minamiaiki Village is known for its highland climate and pristine natural environment, making it a pleasant destination for those seeking mountain scenery and rural Japanese landscapes.

Visitors can view the dam structure from observation areas and walk across the dam crest, which offers panoramic views of both the reservoir and the valley below. The surrounding area features walking trails and parks suitable for picnicking and nature observation. The reservoir itself is not typically used for water sports or fishing, maintaining its focus as an infrastructure and scenic viewing location. Photography enthusiasts appreciate the dramatic engineering against the mountain backdrop.

Access to Minamiaiki Dam requires private transportation as public transit options are limited. The dam is approximately 20 kilometers from Koumi Station on the JR Koumi Line, taking roughly 30 minutes by car. From Saku city, the drive takes about 40 minutes via Route 299. Parking facilities are available near the dam site. There is no admission fee to view the dam or access the observation areas, making it a cost-free attraction for travelers exploring the highland regions of Nagano Prefecture.