Guide
Jozankei Dam is a multi-purpose dam situated within the rich natural environment of Sapporo. It serves three vital roles: flood control, securing water supply, and hydroelectric power generation. Standing at a height of 117.5m, it is one of the largest gravity concrete dams in Hokkaido, offering an awe-inspiring sight where massive engineering meets untouched nature. The area features the 'Jozankei Dam Downstream Park' and the 'Jozankei Dam Museum,' providing excellent facilities to learn about dam mechanisms and the local ecosystem.
The dam was constructed to mitigate the devastating floods experienced in the mid-1970s and to secure a second water source for the rapidly growing population of Sapporo. Completed in 1989, it remains a crucial piece of infrastructure for the city. The Dam Museum showcases the history of its construction through detailed dioramas and panels explaining the local environment, helping visitors understand the intersection of human technology and regional nature.
There are several ways to enjoy the scale of Jozankei Dam. First, the 'Jozankei Dam Museum' offers an educational experience with dioramas and video displays explaining water supply and power generation. Second, the 'No. 1 Observatory' provides a stunning view of 'Lake Sapporo' and the dam's massive structure from the rear. For a unique experience, you can walk through the 'Cross Gallery' (an inspection gallery inside the dam), which allows you to feel the immense scale of the structure from the inside.
The scenery around Jozankei Dam changes beautifully with the seasons. Spring brings cherry blossoms, while autumn offers vibrant foliage. The downstream park is designed with undulating terrain, allowing for various viewing angles of the dam. Additionally, when hydroelectric power generation is not active, you may see water being released through the gates near the 'Keiryu Bridge' (near the 2nd parking lot). Keep an eye out for rainbows that often appear in the mist during water releases.
Learning about dam engineering is a highlight, whether through the museum exhibits or the 'Cross Gallery.' The gallery is a part of the dam's inspection corridor opened to the public; it maintains a cool, constant temperature of about 10°C year-round. Another popular activity is collecting the 'Dam Card.' These can be obtained at the Jozankei Dam Management Office or the Dam Museum reception (please check the official website for specific distribution conditions and times).
The 'Jozankei Lake Line' is a popular scenic driving route passing near the dam. Along this route, you can find several observatories overlooking Lake Sapporo. If you travel slightly further south, you can visit the Hohei-kyo Dam to see a different type of dam structure. The downstream park also serves as a trailhead for Mt. Kotengu (elevation 764.7m), perfect for hikers and nature lovers.
Because the Cross Gallery inside the dam remains at a constant low temperature, we recommend bringing a light jacket or layers. Since you will be walking on paths, stairs, and potentially uneven surfaces, comfortable walking shoes are highly recommended. Note that the walkway next to the museum involves 402 steps up and 58 steps down, so please watch your step. Please note that no food, camping, or fires are allowed in the downstream park. As there are no vending machines or trash cans on-site, please bring your own drinks and ensure you carry all your trash back with you.