Kurobe Dam, Japan’s tallest dam at 186 metres, was built through one of the country’s most demanding postwar construction projects, driving a tunnel through unstable, high-pressure rock to reach the remote gorge site. Today the dam is best known for its dramatic summer water discharge, when huge volumes of water are released down the dam face, often accompanied by a visible rainbow in the spray, set against a backdrop of Northern Japan Alps peaks reached as part of the Tateyama Kurobe Alpine Route.
🗓️ At a Glance
| Location | Tateyama Kurobe Alpine Route, Toyama/Nagano border |
| Hours | Late June–mid October for the water discharge |
| Admission | Included in Tateyama Kurobe Alpine Route fare |
| Time needed | 1–2 hours at the dam |
| Best time | Late June–October, midday for the rainbow effect |
What to See
- The dramatic summer water discharge down the dam face.
- Japan’s tallest dam at 186 metres.
- A visible rainbow effect in the spray, weather permitting.
- Alpine views across the Northern Japan Alps.
Combine Your Visit
- Combine with the Tateyama Snow Corridor further along the route.
- Pair with the full Tateyama Kurobe Alpine Route journey.
- Read our Toyama overview .
Getting There
- By train + cable car: from Toyama Station via the alpine route, or from the Nagano side via Ogizawa.
- By car: park at either end terminus, as private cars cannot cross the route itself.
Tips
The dramatic water discharge only runs from late June through mid-October, so time your visit accordingly if it’s the main draw. Midday visits offer the best chance of seeing a rainbow in the spray, weather and sun angle permitting.
