Shin-Tamagawa Onsen, Semboku, Akita Prefecture
Shin-Tamagawa Onsen Day Bath
Choose it for the modern facilities, extensive range of baths, outdoor pool and year-round operation. It draws from the same source as Tamagawa Onsen, so decide between them by facilities and season rather than spring quality.
Check before bathing
- Opening hours
- Day use: 10:00–15:00, last admission 14:30. Adult admission is ¥1,000 and child admission ¥500. Indoor rock-bed bathing and private baths are for overnight guests only.
- Access
- Open in winter, but general vehicles cannot reach the hotel during National Route 341 restrictions. Use the route bus from Tazawako Station and confirm the current timetable.
Spring & water temperature
- Spring-source temperature
- 98°C at the shared Great Boiling Spring; this is not bath temperature.
- Bathing temperature
- Not published; spring concentration and temperature are adjusted by pool.
- Spring source
- Obuki (Great Boiling Spring), shared with Tamagawa Onsen.
- Spring classification
- Strongly acidic spring whose main component is hydrochloric acid, as described by the hotel.
- pH
- 1.2 for the shared source.
- Flow rate
- About 9,000 L/min at the shared Great Boiling Spring.
- Water handling
- Pools use different concentrations of the same source, including 100%, 50% and weaker spring water. The current hotel guide lists the outdoor bath at 30% source water. Pool-specific treatment details are not fully published.
Bathing indications
The hotel's health and bathing information is general spring-use guidance, not a guarantee of medical benefit.
Winter access depends on the route bus because general vehicles cannot reach the area during road restrictions. Day-use hours are 10:00–15:00, last entry 14:30. Tattoos policy is not confirmed.
How to read a bath profile
Spring-source temperature and actual bathing temperature are kept separate. Each score is shown independently for comparison rather than collapsed into one overall score.
