Tamagawa

The Tamagawa is a tributary of the Arakawa, flowing cold and clear through a steep gorge carved into the Iide mountain range. Narrow and enclosed by rock walls, the river feels remote and confined, with limited opportunities to exit once committed to the gorge. It is considered an upper-level run requiring solid technical skills and sound judgment.

Set within a traditional rural landscape of rice fields and forested mountains, the Tamagawa offers a striking contrast between cultivated valleys and rugged canyon terrain. In spring, the surrounding hillsides bloom with native flowers. Although there are signs of human presence upstream, development largely disappears once you enter the gorge.

Flows are highly variable and can be difficult to time. Rainstorms or heavy snowmelt can quickly raise levels to runnable flows, but for much of the year the river is too low. The run is best attempted at moderate flows. High water significantly increases the difficulty, and at elevated levels only expert paddlers should consider launching. Rescue is inherently challenging in the gorge due to high rock walls and limited access. A unique feature of this run is the hot spring bath at the inn overlooking the upper section — a rare opportunity to soak while watching the river below.

Top Section (Kawairiso Inn to Low Head Dam, 2 km, IV+)

This short section packs in three major drops. The first begins immediately at the put-in, where the river bends sharply to the right. A hole forms across much of the channel, but it can be skirted on river left. After a short recovery pool, the river spreads into a rock garden rapid, often with spectators watching from the bathhouse above.

The next major rapid starts just upstream of a footbridge, which can be used for scouting before your run. The river squeezes through a narrow bedrock canyon with exploding waves along the right. It then makes another sharp right-hand bend into a short recovery pool

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