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Chubu-Sangaku NP, Toyama
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At an 80m fractured-rock zone in the access tunnel, 4°C groundwater and debris burst out at up to 660 liters a second. Breaking through took 7 months; the spot is still marked inside the tunnel.
The ancestor of today’s dam curry was workers’ camp curry: crews returning from a tunnel flooded with 4°C water looked forward to it about once a week. After construction, it became “arch curry” in Omachi.
After a dam collapse in southern France, World Bank experts recommended lowering Kurobe from 186m to 150m. Engineers airlifted a French plate jack to test the rock; after 2 years of talks, the 186m plan stood.
Before the supply tunnel opened, people and horses carried construction materials over Tateyama from Toyama. That high-mountain crossing helped get work started in a gorge with no road access.
Kurobe’s spectacular water release is not just for visitors: more than 10 tons of water per second are let out to help preserve the scenery of Kurobe Gorge. Sunlight can turn the spray into a rainbow.
The powerhouse is not inside the dam: water travels about 10km downstream through the mountain to Kurobe No. 4 Power Station. Its facilities were placed underground to protect national-park scenery and avoid winter snow damage.
At peak construction, two cable cranes carried 9m³ concrete buckets across the gorge as many as 960 times in a day. Crews placed 8,653m³ of concrete in a single day.
The broad side “wings” are structural, not decorative: weaker rock high on the valley sides led engineers to use gravity-style sections there. The final design was settled when the dam was nearly two-thirds built.
Surveys and construction claimed 171 lives. Beside Kurobe Dam, a memorial of six human figures bears the names of those lost and a dedicatory inscription—a solemn detail amid the spectacle.
The breakthrough inspired the 1964 nonfiction novel “Kurobe no Taiyo” and a 1968 film starring Yujiro Ishihara and Toshiro Mifune. The movie’s realistic tunnel was built as a set at a factory in Toyokawa.
