How much does it cost?

Name: Yoshioka Rivertopia
Address: 1989 Urushibara, Yoshioka, Kitagunma District, Gunma 370-3601, Yoshioka, Gunma, JP
Telephone: +81279-55-4126
Rating: 3.7

Right Onsen › Gunma › Yoshioka

Yoshioka Rivertopia

3.7★ · 848 Google ratings · Yoshioka, Gunma · リバートピア吉岡

Open in Google Maps Official site (Japanese)

✓ Private day-use bath✓ Natural hot-spring water✓ Free-flowing source water✓ Outdoor bath✓ Rest area✓ Restaurant

Before you go

Can you bathe here?

Price

¥600Current adult admission is 600 yen, up from 400 yen some years ago per a longtime regular.stated by 4 visitors · Mar 2026 – Jul 2026

Hours

10:00–21:00from the facility listing

Bathing arrangement

Men and women separateMen's and women's baths are separate, referenced independently by different reviewers.stated by 2 visitors · Jun 2026

Tattoos

Not known · call aheadno policy stated in the 24 recent reviews we read or on the facility's website

How we know this

Watch out

Hair dryer

Hair dryers cost 100 yen per 5 minutes; bringing your own dryer to use a free outlet is possible.

stated by 3 visitors · Apr 2026 – Jul 2026

The bath

What you’ll find

A cheap, popular roadside-station day-spa (michi-no-eki) with brown iron-tinged water, a spacious open-air bath with two uchase-yu cascade jets, sauna and cold bath, though the outdoor view is plain and hair dryers now cost extra.

Outdoor bath

✓ YesA spacious, open outdoor bath area is a highlight, mentioned across many reviews.stated by 6 visitors · Apr 2026 – Jul 2026

Sauna

✓ YesHas a sauna, though regulars often occupy it.stated by 2 visitors · Jun 2026 – Aug 2026

Cold bath

✓ YesA cold plunge bath exists next to the sauna, though it's often occupied by regulars.stated by 2 visitors · Jun 2026 – Aug 2026

Restaurant

✓ YesAn on-site restaurant serves food including motsuni stew, soba and set meals with the bath.stated by 4 visitors · Apr 2026 – Aug 2026

The water

Spring type

Iron-rich, brown-coloredWater is consistently described as brownish, likely iron-rich.stated by 4 visitors · Mar 2026 – Jul 2026

Practical

What to bring

Lockers

✓ FreeShoe lockers and lockable changing-room lockers are free, no coin deposit needed.stated by 2 visitors · Apr 2026 – Jul 2026

Hair dryer

PaidHair dryers cost 100 yen per 5 minutes; bringing your own dryer to use a free outlet is possible.stated by 3 visitors · Apr 2026 – Jul 2026

Guide

What visitors add

Outdoor bath & sauna

The open-air bath is large and open to the sky — at least five reviewers call it wide/open (one notes the view itself is bleak, wishing the river were visible; one says there are two outdoor baths). Utase-yu (cascade massage streams) are mentioned by at least four reviewers, one specifying two streams at different heights with the left one stronger.

stated by 8 visitors · Mar 2026 – Jul 2026

Price

Admission is 600 yen, confirmed by four reviewers (2026), including on Saturdays; one long-time visitor notes it used to be 400 yen. One reviewer describes a 1,450-yen set that includes a 1,000-yen meal voucher, and another describes a stamp card that earns a free visit when full, with double-stamp days.

stated by 6 visitors · Mar 2026 – Jul 2026

Day-use visits

This is a day-use onsen adjacent to a roadside station (michi-no-eki); monthly closure days are published online per one reviewer who checked before visiting. Crowding reports conflict: one says it is relatively quiet even on weekends and another had a quiet weekday afternoon, while two others found it crowded (one saying it was busy from morning to night).

stated by 5 visitors · Mar 2026 – Jul 2026

The water

The spring water is brown-tinted — four reviewers describe brown water, one guessing it looks iron-rich — and reviewers like the quality: one says skin becomes smooth, two others say the water quality is good enough to make them regulars. On temperature, one reviewer found it not too hot (pleasant), and another (early March) found the outdoor bath lukewarm compared with the indoor bath.

stated by 5 visitors · Mar 2026 – Jul 2026

Price

Hair dryers cost 100 yen per 5 minutes (three reviewers, one noting they are Dyson dryers); one reviewer says an outlet for a dryer you bring yourself is free, and another notes the paid dryer switch was a recent change.

stated by 3 visitors · Apr 2026 – Jul 2026

Outdoor bath & sauna

There is a sauna and a cold plunge bath (three reviewers), but two reviewers report regulars monopolizing them — one says regulars occupy the women's sauna and cold bath even on weekdays, and another could hardly get into the cold bath.

stated by 3 visitors · Jun 2026 – Aug 2026

Timing