Dams, Canals Chubu Area
Iwaya Dam





Purpose | FAWIP *See more -> the functions of the dam |
---|---|
Location | Gero City, Gifu Pref. *See more |
River | Maze River, Kiso River System |
Type | Rockfill dam |
Gate | Radial gate:2 |
Dam Height(m) | 128 |
Crest Length(m) | 366 |
Total Storage (1,000m³) |
173,500 |
Completion | 1976 |
Details | Iwaya Dam has a ski jumping-type spillway. As to the design of the spillway, hydraulic model experiment was conducted and formation of water cushion was confirmed through the design calculation and the hydraulic model experiment. |

Ayu-chan
Location
- Address
- Gero City, Gifu Pref.
- Phone No.
- +81-576-35-2339
*Iwaya Dam Operation and Maintenance Office
Access
Train
Approx. 25 min. by car from Hida-Kanayama Sta. of JR Takayama Main Line
Car
Approx. 60 min. from Gujo-Hachiman IC of Tokai-Hokuriku Expressway
Approx. 60 min. from Tomikaseki IC of Tokai-Kanjo Expressway
Approx. 60 min. from Tomikaseki IC of Tokai-Kanjo Expressway
Dam Card


Tourist Spots
- Gero Hot Springs
Gero Hot Springs resort is well known as one of the three renowned hot springs in Japan and attracts many hot spring fans from all over Japan. 80 degree hot water has been pouring out from the sources and distributed to the hotels and Japanese style inns, etc. Many tourists appreciate cosy atmosphere in addition to the smooth skin they can get with hot baths bathing.
Photo by "Gero Onsen Official Website" HP
See more ->Gero Onsen Official Website- Gujo Hachiman of Gujo City and Gujo Hachiman Castle
About half an hour drive from Iwaya Dam, there is an authentic small town named Gujo Hachiman. As its English website states you can have an experience of a visit to an "off the beaten path" town. Central part of the town was is designated as an Important Preservation District for Groups of HIstoric Buildings. When you walk through the street, you will easily find many water water containers with affluent water is pouring into and water fountains directly. Gujyo Hachiman Castle is one of the must to see sites for tourists. The castle tower was reconstructed but its main structure is of woods and from there you could see the town and surrounding forest.
Photo by "Gujo Hachiman Tourism Association" HP
See more ->Gujo Hachiman Tourism Association
Gujo Tourism Federation
Gourmet Information

Iwaya Dam Curry and Rice
Served with some deep-fried chicken and a fried sweetfish
¥980 (excluding tax)
¥980 (excluding tax)
Mazegawa Hot Spring "Mikinosato"
- Address
- 1695 Mazenishimura, Gero City, Gifu Pref.
- Phone No.
- +81-576ー47-2641
- Open
- 11:00-14:30, 17:00-19:30
- Closed
- Irregular holidays

Green Dam Curry and Rice
Spinach Green Curry and Rice, symbolizing the dam reservoir environment
¥980 (excluding tax)
¥980 (excluding tax)
Hida Kanayama Hot Spring "Yuttarikan"
- Address
- 973-2 Kanayamacho-kanayama, Gero City, Gifu Pref.
- Phone No.
- +81-576ー33-2492
- Open
- 10:00-20:00(14:00-17:00 / serve only drinks on Weekdays)
- Closed
- on Tue.
*Prices and ingredients may change.
Events
- Tanokami Festival of Gero (Nationally designated important intangible folk culture asset) so-called "Hanagasa (=Flower Cap) Festival" [7 through 14 February]
This is the annual "Tanokami Festival", literally meaning Rice Paddy Deity Festival held at Moriminashi-hachiman Shrine. This is called the festival to signal the coming of spring to Hida Region of Central Japan. Four youngsters called "dancers" wearing colorful flower-decorated caps perform dancing at the shrine. That's why this festival is also called Flower Cap Festival.
This festival has been successfully inherited for generations and in 1981 this was designated as an important intangible folk culture asset.
Photo by "Gero Onsen Official Website" HP
See more ->Gero Onsen Official Website- Bonfire Fishing at clear stream Mazegawa River [End of August to Beginning of September]
Mazegawa River is well known for its pure and clean water quality. Thanks to its extra cleanness of water, the sweet fishes living in this river present surprisingly sweet and fresh taste to the local people who catch and grill the sweet fishes there. On this river fishermen take the traditional fishing method of using firing torches hung on the bamboo rods. Moving the rods with torches here and there along the river, those sweet fishes are surprised and frightened to stay away from them and get caught with the fishing net. This fishing method once died sometime ago but as this represented the traditional fishing method and the local fishermen revived it with strong enthusiasm in success in 2012.
Photo by "Southern Hida Maze River Tourist Association" HP
See more ->Southern Hida Maze River Tourist Association