Hokkaido Official Tourism Site HOKKAIDO LOVE!

Located about 7 km upstream from Jozankei Onsen, Hoheikyo Dam is a premier scenic destination where the awe-inspiring scale of a massive arch dam meets the ever-changing beauty of nature. Standing 102.5 meters tall and spanning 305 meters, this impressive arch structure offers a breathtaking experience for every visitor.

From the observation deck, you can take in sweeping views of the dam and its serene reservoir set deep within a forested valley. During selected periods, controlled sightseeing water discharge offers a dramatic spectacle as torrents of water cascade down with a thunderous roar. Recognized among Japan’s “100 Forests for Water Sources” and “100 Selected Dam Lakes,” the Toyohira River remains an essential lifeline, supporting about 98% of Sapporo’s water needs. The name Sapporo itself stems from the Ainu words “Sat Poro Pet,” meaning “large, dry river,” adding a layer of cultural depth to the landscape.

To protect this pristine environment, private vehicles are prohibited beyond the Reisui Tunnel. Visitors complete the final leg of the journey via eco-friendly electric buses, a sustainable initiative in place since 1976. This quiet ride through the canyon allows you to fully immerse yourself in the fresh air and lush surroundings, reflecting a long-standing commitment to balancing tourism with nature conservation.