It is an arch-type dam, a structure designed to push against the rock walls of the valley to maintain stability.
The reservoir, Jōzan Lake, is often listed among the best water-viewing spots in Hokkaido.
The dam is part of a strict environmental protection zone, necessitating the use of zero-emission electric buses for the final approach.
The site remains one of the most popular autumn color foliage destinations in the Sapporo vicinity.
The dam's primary function is water supply for Sapporo City alongside its hydroelectric and flood control duties.
Hōheikyō Dam is an arch-type dam situated in the Toyohira River valley, constructed primarily for flood control and hydroelectric power generation in Sapporo. The facility features a large reservoir known as Jōzan Lake, surrounded by steep, forested mountains. Visitors access the dam via a dedicated electric bus transfer from the parking area, as private vehicles are prohibited beyond a certain point to protect the local environment. The site is recognized by the Ministry of Land, Infrastructure, Transport and Tourism as one of Japan's top 100 dam lakes. An on-site museum provides information regarding the dam's engineering and the region's geological history. The dam is also a designated spot for viewing autumn foliage, drawing significant crowds during the peak color season. Water discharge demonstrations are periodically held to showcase the volume of the dam.
The observation deck overlooking the dam wall and the spillway gates.
Bring a light jacket as temperatures at the dam can be noticeably cooler than in central Sapporo.
Check the official website for current water discharge schedules if you want to see the spillway in action.
Stay on designated paths as the surrounding area is steep and heavily forested.
Attempting to hike the entire access road on foot, which is long and lacks pedestrian-friendly infrastructure compared to the electric bus service.
Closed during winter months due to heavy snow; typically reopens in late spring and closes in early November.
Stay behind safety railings at all times and do not dispose of litter in the surrounding forest area.
