Photo Spot · Okutama

Shiromaru Dam Fish Ladder 白丸ダム魚道

Okutama dam with Japan's longest fish ladder (about 330 m), a spiralling concrete passage you can walk down inside the dam.

HoursApr-Nov, mainly weekends and holidays (daily Jul-Aug)

ClosedDecember to March; weekdays outside summer

PriceFree

Getting thereShiromaru Station (JR Ome Line), about 10 min

Time needed30-60 min

Best timeAutumn leaves in November

AddressTanazawa, Okutama, Nishitama District, Tokyo 198-0107

About

Shiromaru Dam on the Tama River has what GO TOKYO calls the longest fish ladder in Japan, about 330 m, built so trout can migrate upstream. Visitors descend a spiral staircase inside a tower to walk alongside the stepped channels, a strikingly geometric photo subject. It is a short hike from Hatonosu Gorge.

Highlights

Japan's longest fish ladder
Spiral staircase into the dam
Geometric concrete channels
Near Hatonosu Gorge

Tips

Open April to November, mainly weekends and holidays (daily in July-August)
Walk from Hatonosu or Shiromaru Station on the JR Ome Line
Free

Open in Google Maps · Info checked 2026-10-11

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Shiromaru Dam Fish Ladder 白丸ダム魚道

About

Highlights

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