Overview
Kanogawa Dam is a 61-meter-high concrete gravity dam built on the Hiji River in Ozu City, Ehime Prefecture. As a multipurpose dam under Japan's national river authority, it serves both flood control and hydroelectric power generation, with a crest length of roughly 168 meters. The reservoir it creates, Lake Kanogawa, spreads through a quiet valley, and the contrast between the calm water surface and the massive concrete wall gives the site a striking, industrial-yet-serene character. The dam was born from the need to tame the notoriously flood-prone Hiji River.
Highlights
- ●Massive concrete gravity dam, 61 m tall and about 168 m long
- ●Lake Kanogawa, a still reservoir tucked into a mountain valley
- ●A working multipurpose dam for flood control and power
- ●Dreamlike morning mists typical of the Hiji River valley
History
Construction of Kanogawa Dam began in 1953 and was completed in 1958. Its catchment area covers 513 square kilometers, and when full the reservoir floods about 232 hectares of land and holds roughly 48.2 million cubic meters of water. More than half a century after completion, a major renovation was carried out in 2018 to strengthen its flood-control capability. The dam reflects a long local history of struggle against the river's repeated flooding, reshaped over the decades to meet the changing needs of the region.
Access
The dam sits in a mountainous stretch of the middle Hiji River in Ozu City, Ehime Prefecture. Most visitors arrive by car from Matsuyama or central Ozu via national routes such as Route 197, with viewpoints of the dam wall and Lake Kanogawa found along the lakeside roads. Public transport in the area is limited, so a private car or rental car is the practical choice. Because the surrounding roads wind through the hills, it is wise to check current road conditions and whether facility tours are available through official sources before visiting.
Best season
The site changes character through the seasons, but it feels especially beautiful in early summer, when fresh greenery frames the lake, and in autumn, when the hillsides take on warm color. The Hiji River valley is also known for its morning mists, and on chilly mornings you may encounter fog drifting dreamily over the water. During rainy periods, water releases and rising levels can dramatically alter the scenery, so it is best to check the weather before your trip.
Map
33.4503, 132.6856 · Wikidata
Suggested itinerary
- 1Drive upriver along the Hiji from central Ozu to the dam
- 2Take in the 61-meter scale from a viewpoint of the dam wall
- 3Gaze over Lake Kanogawa and the surrounding ridges from the lakeside road
- 4Head back downstream toward Ozu to explore the riverside town
Did you know?
💡 The Hiji River held back by Kanogawa Dam is a river with real personality, famous downstream near Ozu and Nagahama for the Hijikawa-arashi, a cold wind that comes rushing down the river valley. Lake Kanogawa is one of the key points where the river's upstream waters are gathered and controlled. Seen from below as a wall spanning a mountain valley, the 61-meter dam is more imposing than its numbers alone suggest.
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