Overview
Kozogawa Dam is a water-supply dam in Tano-cho, Mito City, Ibaraki Prefecture. This gravity dam on the Kozogawa, a right tributary of the Tano River in the Nakagawa River system, rises 35 meters high with a 364-meter-long crest and serves as a reservoir supplying drinking water. With a catchment area of just 0.3 square kilometers, it sits amid a calm water surface and surrounding greenery.
Highlights
- ●35-meter-high gravity dam structure
- ●Reservoir of about 20 hectares when full
- ●Rare role as a dedicated water-supply dam
- ●Nature along the Kozogawa tributary of the Tano River
History
Construction began in 1980 and was completed in 1985. When full, the reservoir spreads across about 20 hectares and holds roughly 1,970,000 cubic meters of water. It was built exclusively as a dedicated water-supply dam.
Access
Located in Tano-cho, Mito City, Ibaraki Prefecture, the dam lies in the hilly terrain of the Nakagawa River system, so access is mainly by car. Please check maps and official information for detailed routes.
Best season
Spring to early summer, when the greenery is vivid, and the autumn foliage season make for pleasant strolls. Viewing the calm water during bright daytime hours is especially recommended.
Map
36.4208, 140.3947 · Wikidata
Suggested itinerary
- 1Drive from central Mito to Kozogawa Dam
- 2Enjoy views of the dam body and reservoir
- 3Take a leisurely stroll through the surrounding greenery
- 4Return to central Mito for further sightseeing
Did you know?
💡 Built solely to supply drinking water, the dam has an unusually small catchment area of only 0.3 square kilometers. Dams dedicated purely to water supply are relatively rare in Japan.
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