Ikaho Onsen Ishidan-no-Yu

The stone steps and the golden water

Ikaho's symbol, the 365-step stone stairway, dates from 1576, when Takeda Katsuyori ordered a planned spa town built to nurse soldiers wounded at the Battle of Nagashino — one of Japan's oldest examples of hot-spring town planning. Beneath the steps the spring still flows through distribution channels called 'komaguchi', visible through glass panels. Ishidan-no-yu is a Shibukawa municipal bath about 94 steps up, its storehouse-style façade blending into the streetscape. It uses the historic 'Kogane-no-yu' (golden water), one of Ikaho's two sources: rich in iron, it emerges clear, oxidises to rust-brown and carries a faint metallic scent. Celebrated in the Man'yōshū anthology and loved by the artist Takehisa Yumeji and the novelist Tokutomi Roka, it warms to the core and has long been prized by women as a 'fertility bath'. There is no open-air pool, but with proper washing stations, showers and an upstairs tatami hall it is the most practical place to try the genuine golden water in the middle of a stroll up the steps.

Practical notes & how it compares with Ikaho Rotenburo

• Shampoo and body wash provided; towels sold (bring your own). Free lockers, hair dryers.
• The water is a mild 40°C or so, good for a long soak. The colour varies day to day and can be almost clear on lighter days.
• Iron stains white towels brown — bring an old one.
• The upstairs tatami hall is free to use; check the notices on bringing in food and drink.
• As a municipal bath there is no explicit tattoo ban, but be considerate.
• Busiest 2–5 pm on weekends and holidays; weekday mornings and after 6 pm are quiet.
• Ten minutes' walk beyond the top of the steps (Ikaho Shrine) is Ikaho Rotenburo at the source itself (¥600, open-air only, no washing stations, closed 1st & 3rd Thursdays), where the golden water is at its strongest. Wash and soak at Ishidan-no-yu, or soak in the concentrated water outdoors at the Rotenburo — connoisseurs do both.
• Near the top of the steps are the free 'Tatsu-no-yu' foot bath and a drinking fountain (the golden water tastes of iron).

Access and surroundings

From Shibukawa Station (JR Jōetsu/Agatsuma lines) the Kan-etsu Kōtsū bus to Ikaho Onsen takes about 25 minutes; alight at the Ikaho Onsen terminal at the foot of the steps or at 'Sekisho-mae', then climb 2–5 minutes. From Tokyo take the Jōetsu Shinkansen to Takasaki and change (about 25 min to Shibukawa), or the 'Jōshū Yumeguri' highway bus from Shinjuku/Ikebukuro, about 2.5 hours. By car it is 20 minutes from Shibukawa-Ikaho IC; with only 10 spaces at the bath, use the paid municipal car parks around the steps. Along the steps are Shōgetsudō, birthplace of the onsen manjū bun, old-style shooting galleries, the Ikaho checkpoint museum, the Takehisa Yumeji Memorial Museum (5 min by car), a ropeway, and Kajika Bridge (15 min walk), famous for illuminated autumn leaves.