Riverside Hot Springs Inn & Spa, Idaho: Adults-Only Soaking

What Makes This Hotel Different

The soaking happens on site, indoors, in private rooms fed by a continuous geothermal flow. That arrangement is the whole appeal: you reserve a slot, close the door and soak without an audience. The trade-off is that sessions are timed, so a long lazy afternoon in the water is not the format here; you book your half hours and build the rest of the day around them.

Location matters as much as the water. The inn stands one block off Main Street, so dinner, shops and the town's public pools are walkable. Guests who want more soaking time than their private sessions allow can walk roughly 0.2 miles to the Lava Hot Springs Foundation pools and buy access there.

The Water

The geothermal source reaches the surface at 112°F and is cooled to a soaking range of 102 to 106°F. Water flows continuously through the soaking rooms and is not chemically treated, and the mineral water is odorless rather than sulfurous. Ease into a session, test the temperature before you commit, and keep your head above the waterline in untreated geothermal water.

The Soaking Rooms

There are three private indoor soaking rooms plus one outdoor soaking barrel. The indoor rooms are clothing optional; the outdoor barrel requires swimwear. Because the rooms and barrel run by appointment, every guest reserves a session in advance in 30-minute slots, so decide how many soaks you want before you arrive: walk-in soaking isn't an option here.

No attendant is present during a session, so the room is yours to manage. If the water feels hotter than you expected on arrival, give the room a few minutes to settle or adjust the overflow, and treat the 30-minute limit as the house standard rather than a suggestion.

Who Can Visit

The hotel is adults only: guests must be 20 years of age or older, and children under 20 are not permitted. Hot spring access is reserved exclusively for overnight guests, with no day-use or public access to the soaking rooms. That means a room booking is the only route to the water here — you cannot stop in for a soak on a road trip through town.

Getting There

The address is 255 East Portneuf Street in downtown Lava Hot Springs, on the bank of the Portneuf River. From Pocatello, take I-15 South to exit 47 for US-30 East and follow US-30 into town; the drive runs about 35 to 40 minutes. From Salt Lake City, the route north on I-15 and east on US-30 takes roughly two and a half hours.

On-site parking is available for hotel guests, and the property is staffed around the clock. Once you park, the town is compact enough to leave the car: the Foundation pools, shops and restaurants are all within walking distance.

The Hotel

The inn has 18 individually decorated guest rooms, an on-site spa with massage therapy available by appointment, meeting space and a lobby cafe. The building dates to 1914 and carries the physical character of that age, including older stairways and narrow corridors, so pack accordingly if you haul heavy luggage. Exterior doors lock after 11pm and guests use room keys to get back in.

Emergency services for Lava Hot Springs come through Bannock County, and the nearest hospital with emergency services is in Pocatello, about 35 miles away. The inn is staffed 24 hours a day, so there is someone on hand if a question comes up during your stay.

Eating On Site

The Portneuf Grille and Lounge serves dinner nightly, with late-night food on Fridays and Saturdays, so you can eat a full dinner without leaving the property after a soak. The Cafe and A'more in the lobby opens each morning for breakfast. Both are open to the public as well as hotel guests, which means the dining room draws in town traffic alongside overnighters.

Pets and Accessibility

The inn is pet-friendly for dogs and cats in guest rooms, with size limitations, so confirm your animal's size when you book rather than at the front desk. Accessible parking and entry details are worth a phone call before booking: the property is listed as not wheelchair accessible because of its historic 1914 structure, and guests with mobility needs should ask which areas of the building they can use.

How It Compares

This is a privacy-first soak: a private room, a scheduled 30-minute session, clothing optional indoors and no chemicals in the water. The Lava Hot Springs Foundation World Famous Hot Pools, a short walk away, offer the opposite experience with large public pools and open soaking time. Many guests use both — a private session at the inn and an afternoon at the public pools.

The quiet comes with a schedule, and that is the central trade-off. If your idea of a hot spring day is drifting between pools for hours, the public side of town fits better; if you want a booked half hour with the door closed and dinner downstairs afterward, the inn delivers it.

Crowds and Timing

Lava Hot Springs fills up in summer, when river tubing on the Portneuf is popular and the town's pools draw day crowds. The inn's 18 rooms and appointment-only soaking rooms keep the property itself intimate even when Main Street is busy. A stay outside peak summer trades tubing weather for a quieter downtown and easier walk-up dining.

Book your soaking slots when you reserve the room, especially for a summer weekend, because the three indoor rooms and one barrel are the entire supply. Tubing the Portneuf is a separate activity with its own river conditions, so plan it as its own outing rather than an extension of a soak.

Combining Soaks

Lava Hot Springs sits in southeastern Idaho, which makes it a natural stop on a longer circuit through the state's hot springs in Idaho. A Sawtooth road trip links Frenchman's Bend near Ketchum, where rock-walled pools sit along Warm Springs Creek, with Basin Creek's primitive pools on the Salmon River near Stanley and Sawtooth Lodge at the edge of the wilderness. Pair the inn's private soaking and full dinner with those wilder, hike-in soaks for a trip that covers both ends of the spectrum.

Closer to the interstate, Miracle Hot Springs and Banbury Hot Springs near Buhl and Heise Hot Springs outside Idaho Falls make easier add-ons if you are driving between Pocatello and the Snake River Plain. Farther northwest, Burgdorf Hot Springs in Payette National Forest rewards a longer detour with a remote mountain setting. Pick one or two of these rather than stacking them all into a single day.

Who This Suits

Couples, solo travelers and adult groups get the most from this property: a historic building, private soaking, a restaurant downstairs and a walkable town. Families with children under 20 should book elsewhere in Lava Hot Springs, since the age policy applies to the whole property. Anyone who needs step-free access should call before booking to talk through the historic building's limits.

Plan Your Stay

Book a room, then book your soaking sessions at the same time: three indoor rooms and one outdoor barrel are all the hot water the inn has, and each session runs 30 minutes. The property phone line and website take both, and the staff can answer questions about pets, access and timing before you commit. Guests must be 20 or older, and the pools are for overnight guests only.

Come for the privacy and the 1914 building, stay for dinner at the Portneuf Grille, and walk to the public pools when you want more water time. Confirm current conditions and availability with the inn before you travel.