Akita · Mizusawa Onsen, Tazawako plateau
Rotenburo Mizusawa Onsen, Tazawako Kōgen
露天風呂 水沢温泉（田沢湖高原）
The representative drop-in bath of the Mizusawa spa cluster on the Tazawako plateau, on the road up to Nyūtō Onsen. Less famous than Nyūtō's hidden inns, it nonetheless runs an abundant sulphur-calcium-magnesium-sulphate-chloride spring free-flowing, and its bluish milky water is praised as 'silky and moisturising'. The standout is an open-air bath about a metre deep in which you soak standing up — one of only two such deep outdoor baths in the area. Men and women each have two indoor and two outdoor baths, and the waterfall massage runs all the time. Adults ¥900, primary-school children and under free; open 10:00–20:00 (building closes 21:00), irregular closures (open through Golden Week, Obon and New Year). Lodging is available, and it makes a good alternative when Nyūtō is crowded or a stop after Tazawako ski slopes or a climb of Mt Akita-Komagatake. About 25 minutes by Ugo Kōtsū bus for Nyūtō Onsen from JR Tazawako Station to 'Mizusawa Onsenkyō', right by the stop; 60 parking spaces.
- Price (adult)
- ¥900
- Hours
- 10:00–20:00
- Closed
- Irregular (open Golden Week, Obon & New Year)
- Access
- Ugo Kōtsū bus for Nyūtō Onsen from JR Tazawako Station (Akita Shinkansen), about 25 min to 'Mizusawa Onsenkyō' right by the stop; about 1 h 10 min by car from Morioka IC via Route 46
- Water type
- Sulfur spring
- Tattoos
- Ask ahead
- Phone
- 0187-46-2111
- Official site
- http://tsukamoto-sogyo.co.jp ↗
- Open in Google Maps
- Google Maps ↗
Essentials
Stay in this onsen town
Compare and book stays in Mizusawa Onsen, Tazawako plateau. Day bathing itself needs no booking.
Opens partner booking site (affiliate)
Why go
- Metre-deep milky open-air bath, soaked standing
- On the road to Nyūtō; alternative when crowded
- ¥900; children free
Before you go
- No official tattoo policy is published — ask at reception.
- Ryokan day-use hours are limited and may be suspended in peak season — phone the same morning.
- Last entry is 30–60 minutes before closing.
Features
Mood & scenery
Price
Convenience
Amenities
✔ Verified operating: 2026-09 ジョルダン（大人900円・10–20時 閉館21:00・不定休）／旅色（同時間・旧料金800円）
Prices and hours change. Check official sources before visiting.
More in this area
Tsurunoyu Onsen
The oldest inn in the Nyuto Onsen area, a hidden hot spring dating to the Edo period. The thatched 'Honjin' building and the large milky-white mixed rotenburo are its iconic scene. Day bathing 10:00–15:00; on Mondays the rotenburo is closed for cleaning and only indoor baths are open. Rooms sell out months ahead. From Tazawako Station take the bus, then the inn shuttle from Alpa Komakusa.
Kuroyu Onsen (Nyūtō)
The innermost of Nyūtō's seven baths — a cluster of thatched bath huts. Two separate sources feed a mixed open-air pool and gender-separated indoor/outdoor baths of milky sulfur water. Day use 9 am–4 pm, the longest window of the seven; closed mid-November to mid-April.
Nyūtō Onsen Tae-no-yu
The most polished of the seven Nyūtō inns, beside the Sendatsu stream and popular with women. Two sources — rusty 'gold' and clear 'silver' — in open-air baths above the rushing river. Day-use reception is short (10:30 am–2 pm), so come early.