A Giant Dam in the Northern Alps
Takase Dam is located within the Chubu-Sangaku National Park, surrounded by the rugged mountains of the Northern Alps. Because the area is environmentally sensitive, private vehicles are not permitted beyond the designated access point.
Visitors must approach the dam either on foot or by authorized taxi. This restriction helps protect the mountain environment while also making the journey to Takase Dam feel like an adventure into a remote alpine valley.
The History of Hydroelectric Power on the Takase River
The Takase River originates in the Hida Mountains and flows through one of Japan’s snowiest regions. Its steep gradient and abundant water made it an attractive location for hydroelectric power generation from an early stage.
During the Taisho period, Toshin Electric constructed the Takase River No. 1 Power Station, followed by additional hydroelectric facilities. After World War II, increasing electricity demand in the Tokyo metropolitan area led to plans to further develop the river’s considerable hydroelectric potential.
The original plans envisioned a large dam system combined with several power stations. As thermal power generation became more widespread, however, the project was redesigned around a pumped-storage hydroelectric system using Takase Dam and nearby Nanakura Dam.
A 10-Year Construction Project
Construction of the project began in 1969 and took approximately ten years to complete. Takase Dam was finally completed in 1979.
The resulting system makes use of electricity when demand is low. During periods of lower electricity consumption, water is pumped from the lower reservoir at Nanakura Dam up to Takase Dam. When electricity demand rises, the stored water is released downhill through turbines to generate power.
This system allows electricity to be stored in the form of elevated water and then generated when needed, making Takase Dam an important part of large-scale electricity management.
Shin-Takasegawa Hydroelectric Power Station
The Shin-Takasegawa Power Station operates as a pumped-storage hydroelectric facility, with Takase Dam serving as the upper reservoir and Nanakura Dam as the lower reservoir.
The facility has a maximum generating capacity of approximately 1.28 million kilowatts and is equipped with four turbine-generator units, each in the 300,000-kilowatt class.
Much of the power station is located underground. The enormous underground facilities demonstrate the scale of the infrastructure hidden beneath the mountains.
A visitor facility known as the Takasegawa TEPCO Museum once offered tours of the dam and power station, but it closed following the Great East Japan Earthquake in 2011.
How to Reach Takase Dam
From Nanakura Sanso
The journey to Takase Dam begins at the gate near Nanakura Sanso. From Shinano-Omachi Station, the journey to Nanakura Sanso takes approximately 30 minutes by taxi.
Beyond the gate, ordinary private vehicles are prohibited. From approximately late April through early November, visitors can use designated authorized taxis. Alternatively, it is possible to walk to the dam, although the one-way journey takes approximately 1.5 to 2 hours.
The restricted access is an important part of preserving this remote mountain environment. Travelers should also be prepared for changing alpine weather and conditions before setting out on foot.
Autumn Colors in Takase Gorge
Takase Dam lies within Takase Gorge, one of Nagano Prefecture’s most spectacular autumn foliage destinations. In fall, the steep mountain slopes surrounding the reservoir turn brilliant shades of red, orange, and gold.
The view from the top of the dam is particularly impressive. Looking across the reservoir and surrounding mountains, visitors can experience the dramatic contrast between the enormous man-made structure and the colorful alpine landscape.
The main autumn foliage season is generally around mid to late October, although the timing varies depending on weather and altitude.
Mountain Views and Scenic Walks
Several scenic spots can be found around the dam and along the approach through Takase Gorge. Yarimidai Observatory, located near the dam embankment, offers views toward the mountains and, on clear days, a glimpse of the summit of Mount Yari.
The Fudosawa Suspension Bridge and Nigorigosawa Waterfall are other popular places to explore. Nigorigosawa Waterfall is especially striking when surrounded by autumn foliage, creating an impressive combination of rushing water, colorful forests, and steep mountain terrain.
Yumata Onsen and Alpine Hiking
Beyond Takase Dam lies Yumata Onsen, a remote hot spring area deep in the mountains. The journey from Takase Dam takes approximately 2.5 hours on foot.
Yumata Onsen is also used as a base for mountain routes toward Mount Yari and Mount Noguchigoro. This makes the area especially appealing to travelers interested in combining alpine hiking with the traditional Japanese hot spring experience.
For those prepared for a longer mountain journey, the route offers a remarkable combination of hydroelectric engineering, rugged wilderness, alpine scenery, and secluded hot springs.
The Emerald Waters of Takase Dam
One of the most memorable features of Takase Dam is the color of its reservoir. Depending on sunlight and weather conditions, the water can appear a vivid emerald green, contrasting beautifully with the surrounding mountains.
The appearance of the reservoir changes throughout the year. Snow-covered peaks and forests create a dramatic winter landscape, fresh greenery surrounds the lake in spring and summer, and autumn brings brilliant colors to the mountainsides.
Where Engineering Meets Mountain Nature
Takase Dam is more than a huge piece of infrastructure. It is a place where Japan’s advanced hydroelectric technology meets the powerful natural landscape of the Northern Alps.
Its 176-meter-high rock-fill structure, vast pumped-storage power system, emerald-green reservoir, and dramatic mountain surroundings make it an unusual destination for travelers interested in both engineering and nature.
At the same time, the surrounding Takase Gorge offers beautiful autumn foliage, mountain viewpoints, waterfalls, suspension bridges, and access to the remote Yumata Onsen area.
For travelers exploring the mountain region around Omachi, a visit to Takase Dam provides an opportunity to see a different side of the Northern Alps—one where enormous engineering works, hydroelectric power, deep valleys, forests, and mountain hot springs exist side by side.