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Kurobe Dam
Kurobe Dam
Kurobe Dam
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The Kurobe Dam (黒部ダム), or Kuroyon Dam (黒四ダム), is a 186 m (610 ft) high variable-radius arch dam on the Kurobe River in Toyama Prefecture, Japan. The tallest dam in Japan,[1] it supports the 335 MW Kurobe No. 4 Hydropower Plant and is owned by Kansai Electric Power Company. It was constructed between 1956 and 1963 at a cost of 51.3 billion yen. The project had taken the lives of 171 people by its completion.[2]

Key Information

History

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Concrete bucket used during construction

In 1951, the Kansai Electric Power Company was formed to provide electric power for the Kansai region of Japan. Shortly after their formation, the area suffered from drought, which caused power rationing. The drought, along with the rapid growth of post–World War II Japan, pushed the company to increase their generating capacity. After a series of geological and hydrological studies of the Kurobe River and Gorge, it was announced in late 1955 that the Kurobe Dam would be constructed.[1]

In July 1956, construction on the dam began.[1] Problems quickly arose while transporting material to the construction site as only one small railway existed through the narrow gorge.[3] Kansai decided to construct the 5.4 km (3.4 mi) Kanden Tunnel under Mount Akazawa that could efficiently bring supplies from Ōmachi eastward towards the construction site. The tunnel's construction proved an arduous task, as a large fracture zone in the rock was encountered, which took seven months to repair. In September 1959, the first concrete for the dam was placed and by October next year, the reservoir had begun to fill.[1]

The Kurobe No. 4 power station was built completely underground to protect it from the avalanches common in the gorge and also for nature-conservation purposes. By January 1961, two of Kurobe No. 4's Pelton turbines had begun operation at an initial capacity of 154 MW. In August 1962, the third turbine was in operation, and by June 1963, the dam was complete at a final cost of ¥ 51.3 billion ($142.5 million (1963)). In 1973, a fourth turbine was installed and became operational, bringing the power station's production capacity to 335 MW. The fourth turbine cost ¥ 1.4 billion yen ($5 million (1973)). The first two turbines were manufactured by Voith and the last two by Japan's Hitachi. The dam initiated the development of Japan's first 275kV transmission system as well, which allowed the transfer of electricity over greater distances.[1]

Specifications

[edit]
Lake Kurobe

The Kurobe Dam is a 492 m (1,614 ft) long, 186 m (610 ft) high, variable-radius (dome) arch dam. The dam is 39.7 m (130 ft) wide at its base, 8.1 m (27 ft) wide at its crest, and contains 1,582,845 m3 (2,070,283 yd3) of concrete. The dam is flanked and supported by two "wing" dams which form the abutments; the one on the left bank is 69 m (226 ft) long and the right is 56 m (184 ft). The dam withholds a reservoir with a capacity of 199,285,175 m3 (260,655,168 yd3) of which 148,843,000 m3 (194,679,000 yd3) is live (active or "useful") storage. The reservoir also has a catchment area of 188.5 km2 (72.8 sq mi) and surface area of 3.49 km2 (1.35 sq mi).[4] The dam's spillway is on its crest and contains 10 11.5 m (38 ft) wide uncontrolled openings with a maximum discharge capacity of 906 m3/s (32,000 cu ft/s). Three other openings exist in the dam's orifice, which consist of 1.5 m (4.9 ft) diameter pipes, two of which can discharge a maximum of 88 m3/s (3,100 cu ft/s) each and the third 44 m3/s (1,600 cu ft/s). The dam's crest elevation is 1,454 m (4,770 ft) above sea level, while the reservoir's normal operating level is 1,448 m (4,751 ft) and low level is considered 1,338 m (4,390 ft).[5]

The dam's power station, Kurobe No. 4, is located underground and contains four generators which are powered by Pelton turbines for a total installed capacity of 335 MW and average annual generation of 1 billion kWh.[1][6] The power station is 22 m (72 ft) wide, 33 m (108 ft) high, and 117 m (384 ft) long. The penstock serving water to the power station is 10,909.6 m (35,793 ft) long and utilizes a maximum effective hydraulic head of 545.5 m (1,790 ft) while transferring a maximum of 72 m3/s (2,500 cu ft/s) to the turbines. The plant's surge chamber is 145.6 m (478 ft) long and 5 m (16 ft) high.[5]

Access

[edit]
Visitors at Kurobe Dam

The Kurobe Dam is the most popular hydropower site in Japan[1] and, between late June and mid-October, water is released from its spillway for onlookers. The surrounding Kurobe Gorge is popular as well and is accessible by the Tateyama Kurobe Alpine Route.

Starting from Toyama Station, visitors can take a combination of trains, cable cars, buses, and walking to access the dam. The whole trip from Toyama Station takes roughly four hours to complete one-way, and costs around 10,000 yen ($66.68 USD) in transportation fees.[7] Various accommodations are available in Murodo area as well as near Tateyama Station, for those too tired to make the trip back down into Toyama City.

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The novel The Sun of Kurobe (黒部の太陽; Kurobe no Taiyō) dramatizes the construction of the dam. It was adapted into the 1968 film The Sands of Kurobe, which focuses on the perils that the construction of the dam and Kanden Tunnel entailed and other circumstances that took a high toll on human life.[1][6]

The television series Project X: Chôsensha tachi (2000–2005) was also based on the dam's construction.[1]

The final arc of the 2004 Tetsujin 28-go anime, which takes place in a fictionalized 1950s Japan, heavily involves the construction of the Kurobe Dam.

The 1961 kaiju film Mothra includes an action sequence filmed at the dam before its completion. Mothra's attack causes the dam to break.

Kurobe dam can be seen in the 1964 film Ghidorah, the Three-Headed Monster.

Kurobe Dam features prominently in the opening scene of the 1966 film Gamera vs. Barugon, in which Gamera attacks the facility's hydroelectric plant to obtain energy in the form of fire. The dam itself then bursts after Gamera collides with it twice while flying away.

The 2000 action thriller Whiteout was shot in and around Kurobe Dam, renamed Okutowa Dam in the film.

The mecha anime television series Kuromukuro (2016) is mainly set in a UN research facility located around the lake.

See also

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References

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[edit]
Revisions and contributorsEdit on WikipediaRead on Wikipedia

Kurobe Dam

View on Grokipedia
from Grokipedia
The Kurobe Dam is a dome-type arch concrete dam situated on the upper reaches of the Kurobe River in the Kurobe Gorge, , . At 186 meters in height and 492 meters in crest length, it stands as the tallest dam in and creates a with a maximum capacity of 199 million cubic meters. Completed in 1963, the structure serves as the main intake for the Kurobe No. 4 Plant, which has a generating capacity of 335 megawatts and is owned and operated by , Inc. Construction of the began in 1956 as part of a larger effort to alleviate severe shortages in Japan's following , enabling industrial expansion and improved living standards. The project, dubbed the "construction of the century," spanned seven years and demanded 10 million man-days of labor at a total cost of ¥51.3 billion (equivalent to about $142.5 million in 1963 U.S. dollars), partially financed by a $37 million loan from the World Bank. Engineers faced formidable challenges in the rugged Northern Alps terrain, including heavy snowfall, V-shaped valleys, subterranean water flows, and frequent landslides, which contributed to the tragic loss of 171 workers' lives during the build. The dam's design incorporated innovative features for its era, such as an underground powerhouse excavated to 150 meters depth to mitigate risks and preserve the surrounding Chubu Sangaku National Park environment. Upon completion, it boosted the Kurobe River basin's total output from 273 megawatts across 12 plants to 608 megawatts across 13, while pioneering 275-kilovolt long-distance transmission over 350 kilometers to distant urban centers. Today, the site holds historical significance as a to engineering resilience, with a honoring the deceased workers, and serves as a key attraction along the , where seasonal water discharges of up to 15 cubic meters per second draw visitors from to October.

Location and Geography

Geological Setting

The Kurobe Gorge, where the Kurobe Dam is situated, is a steep and narrow V-shaped carved through the Northern Japan Alps by the erosive action of the Kurobe River on tectonically uplifted terrain associated with the Tateyama Mountain Range. This formation reflects a combination of tectonic uplift during the Period and fluvial , with contributions from past glacial activity that shaped the broader alpine landscape through ice movement and meltwater incision. The gorge's dramatic relief, descending over 1 kilometer in elevation across just 5 kilometers horizontally, underscores the rapid topographic evolution driven by these processes. Geologically, the site consists primarily of granitic and metamorphic rocks from the Hida Mountain Range, including Permian metamorphic complexes intruded by younger plutons such as the Quaternary Kurobegawa Granite, one of the world's youngest exposed granites at approximately 0.8 million years old. These rocks form the stable yet fractured foundation of the gorge, with the Kurobegawa Granite intruding into older metamorphic units along contacts that highlight the region's prolonged magmatic and metamorphic history. The area lies west of the active Itoigawa–Shizuoka Tectonic Line, a major fault zone contributing to high seismic activity, as evidenced by micro-earthquakes recorded near the site since the early 1960s. Topographically, the dam site sits at an elevation of about 1,500 meters above , nestled amid surrounding peaks in the Northern Alps that exceed 2,500 meters, creating a confined with sheer cliffs and limited alluvial flats. This high-relief setting amplifies geological hazards, including landslide-prone slopes due to the steep gradients and weathered rock faces, as well as subterranean water flows through faulted zones that channel from higher elevations into the river system. These features influenced the site's selection for dam construction, providing natural containment for the reservoir while necessitating adaptations for stability in a seismically active environment.

Regional Context

The Kurobe Dam is located on the upper reaches of the Kurobe River in the Tateyama mountain range of , central . This site places it within the expansive Chubu Sangaku , a spanning 174,323 hectares across four prefectures and protecting diverse alpine ecosystems, including steep gorges and high peaks. The dam's position in the , part of the Northern Alps on the Sea side, underscores its integration into one of 's most rugged and scenic landscapes, where the Tateyama range rises dramatically from surrounding valleys. Geographically, the dam lies in the southern mountainous region of Toyama Prefecture, southeast of Toyama City—the prefectural capital—and near the border with Nagano Prefecture, facilitating connectivity through the Tateyama Kurobe Alpine Route that links the two areas via tunnels and transport links. This route, including a 5.4 km tunnel from the dam site to Omachi in Nagano, highlights the dam's role as a pivotal infrastructure point bridging coastal and inland regions. The remote setting, amid dense forests and alpine terrain, positions the dam approximately 70-80 km from urban centers like Toyama City, emphasizing its isolation yet strategic placement for regional access. In the post-World War II era, the Kurobe Dam project was driven by acute energy shortages in the , where rapid industrialization strained power supplies amid national reconstruction efforts. Constructed between 1956 and 1963, it addressed the need for reliable hydroelectric resources to support economic recovery. Economically, the dam integrates into Japan's broader energy framework by generating power primarily for the (KEPCO), which distributes electricity to major industrial hubs such as and , fueling manufacturing and urban growth in one of the country's most populous economic corridors. This hydropower contribution has been vital for the 's post-war development, providing stable, to sustain heavy industries and household demands.

History and Construction

Planning and Initiation

Following , faced severe energy challenges, including widespread droughts in the 1940s and acute coal shortages due to war-damaged infrastructure and depleted resources, which severely limited thermal power generation and prompted a national push for hydroelectric expansion to support economic reconstruction. Planning for the Kurobe Dam was announced in autumn 1955 by President Shiro Ohtagaki, which identified the need for large-scale to meet surging demand in the , particularly around . The project received formal approval and construction began in July 1956, aligning with broader national energy policies aimed at rapid industrialization and power self-sufficiency. The initiative prioritized the Kurobe River site for its advantageous hydrological features, including a steep topographic drop of 1/40 and high annual of 3,800 mm that promised high-efficiency power generation. Initial feasibility studies confirmed the site's geological suitability for an design, with stable rock formations in the Kurobe Gorge supporting the proposed structure. The project was projected to cost ¥51.3 billion, reflecting the scale of engineering required in the rugged terrain. Funding was secured through a combination of government loans from the Japan Development Bank and bond issuances by the , supplemented by international support including a World Bank loan equivalent to approximately $37 million for foreign exchange components.

Construction Challenges and Timeline

Construction of the Kurobe Dam began in July 1956, initiated by the to address severe postwar energy shortages exacerbated by a 1951 drought. The project, part of the larger Kurobegawa No. 4 development, spanned seven years and culminated in completion in June 1963. Key milestones included the arduous excavation of the 5.4 km Kanden Tunnel, which provided essential access for workers and materials; despite delays from a major rock fracture zone, it was finished by September 1959, allowing the first concrete placement for the dam foundation. Partial reservoir filling started in October 1960, followed by initial power generation in January 1961 with two Pelton turbines, and the project reached full operational capacity by mid-1963 after installing additional turbines. The construction faced immense engineering and environmental challenges in the rugged Kurobe Gorge, located within Chubu-Sangaku National Park, where steep topography, heavy snowfall, and frequent avalanches complicated logistics and safety. A critical obstacle emerged in during tunnel boring when workers encountered a crush zone, causing cold subterranean water, earth, and sand to gush at rates up to 660 liters per second, halting progress for seven months until innovative grouting and drainage techniques were applied. Landslides and avalanches further endangered the site, contributing to numerous fatalities amid the harsh alpine conditions. The dam required 1,583,000 cubic meters of , poured under these adverse circumstances, marking it as Japan's first large-scale constructed in the postwar era. The project demanded a cumulative 10 million man-days of labor, involving a rotating that navigated the remote via the newly built Kanden Tunnel and temporary haul roads for transporting heavy equipment over distances exceeding 5 km. Tragically, these efforts resulted in 171 worker deaths from accidents, , and related hazards, underscoring the human cost of this ambitious endeavor. Despite the toll, the construction exemplified Japanese resilience, with innovations like the underground power facilities and efficient material systems enabling completion at a total cost of ¥51.3 billion.

Completion and Early Operations

The Kurobe Dam reached completion in June 1963, marking the culmination of a seven-year construction effort that had begun in 1956. The project, undertaken by the , involved a cumulative 10 million man-days of labor and was celebrated as one of Japan's most ambitious feats of the . Upon finalization, the dam stood at 186 meters high, forming the core of the Kurobe River No. 4 Hydropower Plant system, with the beginning partial filling as early as October 1960 to support initial testing and operations. Early operations commenced ahead of full dam completion, with the first two Pelton turbines at the Kurobe No. 4 Power Plant becoming operational in January 1961, delivering an initial capacity of 154 MW to address pressing postwar power shortages in the . A third turbine followed in August 1962, and by 1963, the system was fully integrated, enabling stable water flow management through the , which reached operational fullness by 1964. Initial post-completion activities focused on resolving transitional challenges, including the stabilization of reservoir inflows amid seasonal variations and rigorous testing of the gates to ensure safe discharge during high-water periods; these efforts confirmed the structure's integrity against geological stresses observed during filling. The 's capacity of 199 million cubic meters allowed for controlled releases, mitigating flood risks while optimizing output. By the early , the facility expanded further with the addition of a fourth in June 1973, boosting total capacity to 335 MW and enabling annual generation of approximately 1 billion kWh, sufficient to power hundreds of thousands of households. This output played a pivotal role in Japan's , supplying reliable electricity to fuel industrial growth in the Kansai area during a period of rapid and expansion from the late through the . The dam's early contributions helped alleviate chronic energy deficits that had hampered recovery efforts, supporting the nation's transition to a modern economy.

Engineering and Specifications

Dam Structure

The Kurobe Dam is a variable-radius thin arch concrete , recognized as Japan's tallest of its type at 186 in height and featuring a crest length of 492 . The dam's base measures 39.7 thick, tapering to 8.1 at the crest, allowing for an efficient structural profile that minimizes material use while maximizing stability in the narrow Kurobe Canyon. Constructed primarily from 1,582,000 cubic meters of reinforced with , the employs an arch configuration to transfer hydrostatic loads horizontally to the abutments rather than relying on vertical mass, a principle that optimizes resistance to water pressure in steep valleys. Foundation grouting was applied to seal underlying geological faults, ensuring a secure bond with the and preventing seepage. The spillway system consists of a crest overflow with 10 openings, each 11.5 meters wide, capable of a maximum discharge of 906 cubic meters per second, supplemented by three orifice pipes for additional controlled release (two at 88 m³/s and one at 44 m³/s). This setup handles events effectively while integrating with the dam's overall seismic-resistant design, which accounts for regional tectonic activity through reinforced support and flexible jointing.

Power Generation System

The power generation system of the Kurobe Dam primarily consists of the underground Kurobegawa No. 4 , which serves as the main facility with an installed capacity of 335 MW across its four generating units. This station integrates with two auxiliary underground power facilities in the Kurobe River system, contributing to the overall hydroelectric output while handling local operational needs. The design leverages the dam's strategic location to harness high for efficient energy conversion. The core mechanical components include four vertical-shaft Pelton turbines, each equipped with six nozzles to optimize performance under high-head conditions. These turbines, supplied by manufacturers such as and , drive synchronous generators rated at 95 MVA each, enabling a maximum power discharge of 72 m³/s. The effective head measures 545.5 m, derived from the elevation difference between the reservoir surface at EL 1,448 m and the intake, which the dam's 186 m height significantly contributes to. The system utilizes the Kurobe Reservoir's total storage volume of approximately 199 million m³, with active storage of 149 million m³, to support power production, yielding an annual output of roughly 1 billion kWh under typical hydrological conditions. This volume, corresponding to an effective depth of 60 m, allows for sustained generation during periods in the . Electricity from the station is transmitted through Japan's pioneering 275 kV oil-filled cable system, spanning over 350 km to integrate with the Kansai Electric Power grid. The substantial elevation drop facilitates transmission efficiencies exceeding 90%, minimizing losses and enabling reliable supply to urban centers like and . Series capacitor banks further enhance line capacity by about 28%, underscoring the system's engineering advancements in long-distance power delivery.

Reservoir Features

The reservoir impounded by the Kurobe Dam, known as Lake Kurobe, was formed beginning in 1963 upon the structure's completion, submerging several narrow valleys in the upper Kurobe River basin and creating an within the rugged terrain of the . This impoundment transformed the steep Kurobe Canyon, shaped by orogenic movements and glacial , into a storage basin that now serves as a key component of the regional system. Lake Kurobe covers a surface area of 3.49 km² and holds a total capacity of 199 million m³ when filled to its normal elevation of 1,448 m. The reservoir's spans 188.5 km², receiving inflows primarily from the Kurobe River, which delivers an annual volume of approximately 700 million m³ driven by heavy averaging 4,000 mm per year in the basin. ation in the Kurobe River basin occurs at a rate of about 1.4 million m³ annually due to the river's high load from mountainous , while remains minimal given the high-altitude, cool . Ecologically, the reservoir integrates with the surrounding Chubu Sangaku National Park, supporting alpine flora and fauna including and ptarmigan. is actively maintained to ensure suitability for downstream irrigation and municipal uses, with monitoring focused on preventing buildup and preserving the clear, oligotrophic conditions typical of high-mountain lakes.

Operations and Management

Hydropower Production

The Kurobe Dam supports the Kurobe No. 4 Hydropower Plant, which operates primarily as a reservoir-controlled facility capable of run-of-river generation supplemented by peaking operations to address fluctuating electricity demands in the . Daily operations involve regulated water releases from Lake Kurobe, enabling the plant to adjust output for load-following and peak power needs, with turbines responding to grid requirements from the (KEPCO). The facility achieves an average annual utilization of approximately 2,700 hours, reflecting efficient management of seasonal water inflows in the steep Kurobe River basin. Annual electricity output from the plant averages 900 million kWh, sufficient to power around 300,000 households (based on average Japanese household consumption of approximately 3,000 kWh/year), though production varies with precipitation levels and peaks at up to 1.2 billion kWh in years of high rainfall. This generation contributes to KEPCO's broader portfolio, which accounted for about 14% of the company's total power sources in 2023, forming a key component of its mix amid efforts toward carbon neutrality. The plant's 335 MW installed capacity integrates with KEPCO's regional grid, providing stable baseload support while enabling peaking to balance intermittent renewables. Maintenance activities include periodic turbine overhauls to ensure reliability and , such as recent refurbishments at nearby Kurobegawa facilities that upgraded unit capacities by up to 1.1 MW through modernized components. These efforts extend equipment lifespan and incorporate advanced inspection techniques, like underwater drones for assessments, minimizing downtime. The plant also coordinates with KEPCO's pumped-storage systems, such as the Okutataragi facility, to optimize overall dispatch and across the network. In July 2025, the at the Kurobe River No. 4 Power Plant was modernized to enhance safety and . Economically, the Kurobe No. 4 plant generates substantial revenue for KEPCO through electricity sales, estimated at ¥10-15 billion annually based on output volumes and regional wholesale rates, supporting the company's investments in renewable totaling ¥12.7 billion for in 2023. This output underscores the dam's role in delivering cost-effective, low-carbon energy to the Kansai grid.

Water Management and Flood Control

The Kurobe Dam serves a vital function in flood control for the Kurobe basin, regulating peak inflows that can reach up to 1,000 m³/s during intense rainfall or events to prevent downstream inundation in . By storing excess water in its reservoir, which has a total capacity of approximately 199 million m³, the dam attenuates these peaks and has substantially mitigated flooding risks since its completion in 1963, enabling stable land use on the river's . This regulation is particularly important in a region prone to typhoons and heavy seasonal precipitation, where uncontrolled flows historically caused significant damage to communities and . Beyond flood mitigation, the dam supports for in , channeling stored reservoir water into canals to sustain crop production and local farming economies. These allocations help address during dry periods, promoting sustainable agricultural practices in the fertile lowlands downstream. The structure's multi-purpose design ensures that non-power generation needs, such as , are integrated into overall operations without compromising flood safety. Management protocols at the Kurobe Dam emphasize proactive control through seasonal water releases, typically conducted during summer flood seasons from to August to flush and maintain functionality. Real-time monitoring relies on gauges, rainfall systems, and seismic sensors to detect potential risks from earthquakes or , allowing operators to adjust releases dynamically for optimal balance between storage and outflow. In response to post-2000 climate shifts, including a documented increase in rainfall intensity and a transition from snow-dominated to rain-dominated patterns, operational adjustments have incorporated advanced to enhance and allocation resilience. These adaptations help counteract rising probabilities, which have increased from about 20% to over 40% in recent decades due to warmer temperatures reducing storage. A 2025 study examined the long-term impact of operations on bottom and macrobenthic communities in the Kurobe Coast, informing ongoing environmental management.

Access and Tourism

Tateyama Kurobe Alpine Route

The Tateyama Kurobe Alpine Route is a 90-kilometer mountain sightseeing path connecting Tateyama in Toyama Prefecture to Ogizawa in Nagano Prefecture, traversing the Northern Japan Alps with an elevation change of up to 1,975 meters. Opened on June 1, 1971, the route incorporates diverse transportation modes, including cable cars, a ropeway, highland buses, trolley buses, and tunnel electric buses, allowing visitors to navigate steep terrain and long tunnels without private vehicles. Access to the Kurobe Dam is facilitated through the route's central segments, where travelers arrive at Kurobedaira Station after the ropeway from Murodo. From there, a short underground cable car ride descends to Kurobeko Station near the dam's base, followed by a walking path along the and an ascent to the dam crest, providing direct views of the structure. The full journey from Toyama Station, including a local train to Tateyama Station and subsequent route segments, typically takes about four hours one way to reach the dam. Round-trip fares for the route, depending on the starting point and segments used, range from ¥16,000 to ¥21,000 for adults as of 2025, covering transportation from Toyama or Nagano sides back to the origin for dam-focused trips. The route operates seasonally from mid-April to late November, closing during winter due to heavy snowfall that can exceed 10 meters in the highlands. Historically, the route's was developed in parallel with the Kurobe Dam's construction from to , serving as a vital corridor for transporting materials and workers across the challenging alpine terrain via tunnels and cable systems that were later adapted for public use. Following the dam's completion, the full route opened to tourists in 1971, shifting its primary role from industrial access to a premier scenic attraction highlighting the region's natural and engineering features.

Visitor Experiences and Recent Developments

Visitors to the Kurobe Dam can walk across the 492-meter-long dam deck, offering panoramic views of the surrounding Japanese Alps and Kurobe Lake. From the observation deck, accessible via a 15-minute stair climb, tourists witness the dramatic water discharges, where over 10 tons of water per second are released through the spillways, creating a powerful mist and roar that draws crowds daily. These discharges occur from late June to mid-October, with the 2025 season running from June 26 to October 15. The dam attracts more than one million visitors annually, making it one of Japan's premier hydropower tourism sites. Guided tours enhance the experience, including options through nearby Kurobe Gorge and educational walks that highlight the dam's amid alpine landscapes. Safety protocols are in place for high winds and crowds, with recommendations for windproof , sturdy , and early arrivals to avoid peak times; the site closes sections if weather conditions worsen. In 2024, Nippon Otis Elevator Company completed modernization of the elevator at the adjacent Kurobe River No. 4 Power Plant, upgrading the control system and fixtures to improve reliability for operational and tourist access. The planned Kurobe Unazuki Canyon Route, intended to link the dam directly to the Kurobe Gorge Railway via underground trains and cable cars, faced delays and is now slated for opening in 2026 or later. The annual water discharge event commenced on June 26, 2025, as scheduled, allowing visitors to observe the full spectacle from the outset. Seasonally, autumn brings vibrant foliage to the 1,450-meter around the , with peak colors in late September to mid-November, framing the structure in reds and golds. En route via the , travelers encounter the snow walls, which reached up to 16 meters high in 2025, providing a striking contrast during the April-to-June viewing period.

Impact and Legacy

Environmental Considerations

The construction of Kurobe Dam resulted in significant habitat disruption within the Kurobe Gorge, primarily through the submergence of forested areas and scenic landscapes beneath the newly formed Lake Kurobe reservoir. This alteration flooded portions of the upstream river valley, leading to the loss of diverse riparian and montane forest ecosystems that were integral to the Chūbu Sangaku National Park. The dam has also altered patterns in the Kurobe River, particularly affecting amphidromous species such as ayu (Plecoglossus altivelis), a commercially important that relies on upstream access for spawning. By impounding the river and creating barriers to natural flow, the structure has fragmented habitats and reduced connectivity for migratory populations, exacerbating challenges from sediment flushing operations that further disturb aquatic environments downstream. To mitigate these impacts, the associated Kurobe No. 4 Plant was designed with an located approximately 10 kilometers downstream, substantially reducing the surface footprint and preserving the surrounding natural landscape within the . Additionally, (KEPCO) has implemented initiatives around its facilities, planting native tree species to restore vegetation and enhance ecological resilience in disturbed areas near the dam. The formation of Lake Kurobe has fostered a new , supporting including bird species common to the alpine region and introduced populations that thrive in the reservoir's clear waters. KEPCO maintains standards through ongoing monitoring and compliance with environmental regulations, ensuring the lake supports viable habitats without excessive nutrient loading or pollution. As a source of carbon-free , the Kurobe Dam contributes to offsetting , with Japan's overall generation avoiding approximately 70 million tons of CO2 annually through displacement of fossil fuel-based electricity. However, the facility faces vulnerability to , including shifts in seasonal runoff from reduced accumulation and accelerated melting of patches in the northern , potentially altering water availability and inflows.

Cultural Significance and Media Representations

The Kurobe Dam has been prominently featured in Japanese media, reflecting its status as a monumental engineering feat. The 1968 film The Sands of Kurobe, adapted from Shōtarō Ishinomori's 1964 The Sun of Kurobe, dramatizes the grueling construction process, highlighting the human sacrifices and determination involved in building the dam during the late . In the 1961 film Mothra, directed by , the larval form of the titular monster attacks the dam as part of its rampage against human exploitation, using actual footage from the site to depict the destruction. More recently, the 2016 series Kuromukuro, produced by , incorporates the dam into its narrative by setting the Kurobe Research Institute there, where an ancient artifact unearthed during construction sparks a sci-fi conflict blending and historical elements. As a , the Kurobe Dam symbolizes Japan's reconstruction and rapid industrialization, embodying national resilience after through its massive scale and the collective effort requiring 10 million man-days of labor. Completed in 1963 amid economic recovery, it represents a pivotal project that powered the nation's growth, often invoked in discussions of perseverance and technological ambition. To mark its 60th anniversary in 2023, various events were organized at the site, including guided tours and exhibits celebrating its history and legacy, drawing visitors to reflect on its enduring role in Japanese identity. The dam's legacy extends to inspiring subsequent infrastructure projects and serving as an educational hub for . Its innovative arch design and subterranean influenced later Japanese dam constructions by demonstrating advanced techniques in challenging alpine terrain, fostering a generation of civil who studied its methods. Today, it functions as a key learning site, with field trips for students exploring its construction museum and on-site exhibits that detail the project's innovations and challenges, promoting interest in civil engineering careers. Economically, the dam bolsters Toyama Prefecture's through the , generating significant local revenue via visitor attractions like water discharge spectacles and scenic walks. In recent years, the Kurobe Dam has gained international recognition through strengthened ties linked to the Corporation's heritage in the region. In 2025, leaders from Macon-Bibb County, Georgia—Kurobe City's since 1977, established via YKK's 1974 manufacturing plant in Macon—visited to reaffirm cultural and economic exchanges, highlighting shared histories in industry and innovation.

References

  1. https://search.jcold.or.jp/icold/symposium/2011/2011.24.pdf
  2. https://ethw.org/Milestones:Kurobe_River_No._4_Hydropower_Plant%2C_1956-63
  3. https://www.nippon.com/en/guide-to-japan/gu011018/
  4. https://www.japan.travel/en/spot/1422/
  5. https://www.tateyama-kurobe.com/en/area/kurobe-dam.php
  6. https://toyama-bunkaisan.jp/en/search/2640/
  7. https://www.sciencedirect.com/science/article/pii/S0012821X24002632
  8. https://hal.science/hal-04457960/document
  9. https://www.gsj.jp/data/interim-report/GSJ_DOC_INR_028_2003_2.pdf
  10. https://www.nature.com/articles/s41598-021-01562-2
  11. https://www.sciencedirect.com/science/article/abs/pii/0040195172900881
  12. https://tatekuro.jp/en/about/area.html
  13. https://www.apjjf.org/masano-atsuko/3280/article
  14. https://pubs.geoscienceworld.org/gsa/geology/article/51/2/131/619491/Eustatic-change-modulates-exhumation-in-the
  15. https://www.kepco.co.jp/corporate/profile/community/pr/kurobe/guide/en/pwr_gen_eqp.html
  16. https://www.gov-online.go.jp/eng/publicity/book/hlj/html/201908/201908_03_en.html
  17. https://www.mlit.go.jp/tagengo-db/common/001564268.pdf
  18. https://www.kepco.co.jp/corporate/profile/community/pr/kurobe/guide/en/history.html
  19. https://www.kepco.co.jp/english/energy/energy_supply/wholeheartedly/keep_vigilant.html
  20. https://www.researchgate.net/publication/267884262_The_Kurobe_No_4_Dam_Project_amid_Contending_Developmentalist_Visions_of_Post-1945_Japans_Economic_Reconstruction
  21. https://www.cirje.e.u-tokyo.ac.jp/research/dp/2012/2012cf851.pdf
  22. https://documents1.worldbank.org/curated/en/210501468752350060/pdf/multi-page.pdf
  23. https://structurae.net/en/structures/kurobe-dam
  24. https://canyon-route.jp/en/en-history/
  25. https://english.kyodonews.net/news/2023/06/65d4f9931dd8-japans-kurobe-dam-begins-water-discharge-event-delighting-tourists.html
  26. https://www.power-technology.com/data-insights/power-plant-profile-kurobegawa-4-japan/
  27. https://www.ieahydro.org/media/436de719/Annex_VIII_CaseStudy1402_KurobeNo4_Japan.pdf
  28. https://search.jcold.or.jp/icold/apgeadc/E2005.2.pdf
  29. https://www.kepco.co.jp/english/corporate/list/report/pdf/e2024_a4.pdf
  30. https://www.researchgate.net/publication/271457647_Development_of_Kurobe_River_No4_hydropower_plant_as_a_milestone_of_electrical_engineering_in_Japan
  31. https://globalenergyobservatory.org/geoid/3922
  32. https://www.otis.com/en/us/news?cn=nippon-otis-modernizes-elevator-at-kurobe-dam
  33. https://search.jcold.or.jp/icold/symposium/2012/2012.26.pdf
  34. http://damnet.or.jp/cgi-bin/binranA/enAll.cgi?db4=0848
  35. https://toyama-bunkaisan.jp/en/pickup/candidate02.php
  36. https://www.researchgate.net/publication/378570199_PRACTICAL_UTILIZATION_OF_ENSEMBLE_RAINFALL_FORECASTS_FOR_KUROBE_DAM_OPERATION_AND_IMPACT_ASSESSMENT_ON_BASINshiyongxingwokaolushitaheibudamuhenoansanburujiangyuyucenohuoyongfangfajiantaooyobishuixihen
  37. https://www.mdpi.com/2306-5338/12/7/187
  38. https://www.sciencedirect.com/science/article/abs/pii/S0301479725024387
  39. https://www.alpen-route.com/en/
  40. https://visit-toyama-japan.com/en/travel-inspiration/tateyama-kurobe-alpine-route
  41. https://www.japan-guide.com/e/e7550.html
  42. https://www.alpen-route.com/en/info/history.html
  43. https://www.alpen-route.com/en/transport/modes.html
  44. https://www.alpen-route.com/en/transport/fare.html
  45. https://www.alpen-route.com/en/transport/opening.html
  46. https://www.japan-guide.com/e/e7554.html
  47. https://www.gltjp.com/en/directory/item/16222/
  48. https://www.iwafu.com/en/events/1031831
  49. https://www.hydropower-dams.com/articles/kurobe-japans-highest-dam-enhances-tourism-in-addition-to-hydro-generation/
  50. https://www.iwafu.com/en/events/1024878
  51. https://matcha-jp.com/en/24767
  52. https://www.tan-ken.com/en/blog/r-3ptlvfu2bh
  53. https://www.japan-guide.com/news/kurobe-unazuki-canyon-route.html
  54. https://japannews.yomiuri.co.jp/features/travel-spots/20250627-266013/
  55. https://www.snowmonkeyresorts.com/news/tateyama-kurobe-alpine-route-in-october/
  56. https://www.snowmonkeyresorts.com/activities/the-snow-walls-of-tateyama-kurobe/
  57. https://www.japan-guide.com/blog/raina/250428.html
  58. https://www.researchgate.net/publication/273169164_Mountain_dream_or_the_submergence_of_fine_scenery_Japanese_contestations_over_the_Kurobe_Number_Four_Dam_1920-1970
  59. http://www.tenkara-fisher.com/p/genryu.html
  60. https://www.jstage.jst.go.jp/article/journalofjsce/13/2/13_24-16158/_article/-char/en
  61. https://www.kepco.co.jp/english/corporate/list/esg/pdf/esg2022_e_08.pdf
  62. https://www.alpen-route.com/en/seasonal-attraction/summer.html
  63. https://www.jstage.jst.go.jp/article/jmsj/82/6/82_6_1589/_pdf
  64. https://tc.copernicus.org/articles/16/1091/2022/tc-16-1091-2022.pdf
  65. https://asianwiki.com/Kurobe_no_Taiyo
  66. https://www.tohokingdom.com/reviews/galvan/mothra.html
  67. https://www.animenewsnetwork.com/encyclopedia/anime.php?id=17947
  68. https://dampedia.com/en/article
  69. https://www.jsce-int.org/pub/iacnews/118
  70. https://www.maconbibb.us/wherefriendshipbuildsthefuture2025/
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