In Yellowstone National Park, it impossible to find a spa facility where uses the mineral water.
However, in a nearby town, there is a publicly owned bathhouse at no fee.
Hot Springs State Park
It is two and a half hours' drive from one of the most popular national parks, Yellowstone National Park to a small town, Thermopolis.
Hot Springs State Park is located at the edge of the town.
![Black Sulfur Spring 01](https://hotspringers.net/ja/wp-content/uploads/sites/3/2021/10/hot-springs-state-park03.jpg)
First I saw large mineral deposits.
![Teepee Fountain 01](https://hotspringers.net/ja/wp-content/uploads/sites/3/2021/10/hot-springs-state-park06.jpg)
The Tepee Fountain was established in 1909, in order to vent steam from hot mineral water that was piped throughout the park.
The must-see sight in the park would be the far more giant travertine, named Rainbow Terrace.
![Rainbow Terraces 01](https://hotspringers.net/ja/wp-content/uploads/sites/3/2021/10/hot-springs-state-park01.jpg)
The bank of the Bighorn River is coated with mineral deposits on a broad scale.
![The Big Spring 02](https://hotspringers.net/ja/wp-content/uploads/sites/3/2021/10/hot-springs-state-park05.jpg)
The source of the spring is right behind it.
![The Big Spring 01](https://hotspringers.net/ja/wp-content/uploads/sites/3/2021/10/hot-springs-state-park02.jpg)
The Big Spring provides extremely hot (135 degrees F) water, looking mystic in the deep emerald green.
The water is piped to three walk-in facilities and two lodging facilities in the park, and the rest is discarded to the river.
![Rainbow Terraces 02](https://hotspringers.net/ja/wp-content/uploads/sites/3/2021/10/hot-springs-state-park04.jpg)
Walking a path on Rainbow Terrace, I found a pool fed by turquoise blue water.
Complimentary bathhouse
![From the Rainbow Terrace 01](https://hotspringers.net/ja/wp-content/uploads/sites/3/2021/10/hot-springs-state-park-bath-house02.jpg)
The beautiful building looks like a café is actually a public bathhouse; anybody can use it at no fee.
Writing down my name and the entering time, I listened to the instruction.
![](https://hotspringers.net/ja/wp-content/uploads/sites/3/2021/10/hot-springs-state-park-bath-house01.jpg)
According to it, I had to exit here in 20 minutes, and two hours were required if I would re-enter the facility.
![Reception 01](https://hotspringers.net/ja/wp-content/uploads/sites/3/2021/10/hot-springs-state-park-bath-house06.jpg)
This rule might be for preventing congestion.
![Changing Room 01](https://hotspringers.net/ja/wp-content/uploads/sites/3/2021/10/hot-springs-state-park-bath-house07.jpg)
The gender-segregated changing rooms were super clean.
![Indoor Pool 02](https://hotspringers.net/ja/wp-content/uploads/sites/3/2021/10/hot-springs-state-park-bath-house08.jpg)
On the other hand, the 20-minute time limit seemed too short considering I had to wear and take off a swimsuit.
![Indoor Pool 01](https://hotspringers.net/ja/wp-content/uploads/sites/3/2021/10/hot-springs-state-park-bath-house09.jpg)
Inside the well-lit indoor bath, the opaque water accompanied with sulfur smell.
In the backside of the building, I found the roofed outdoor pool.
![Outdoor Pool 02](https://hotspringers.net/ja/wp-content/uploads/sites/3/2021/10/hot-springs-state-park-bath-house04.jpg)
The component change due to oxidation makes different colors per pool.
The water temp in the outdoor pool is around 104 degrees F; the rich contained materials helped me feel hotter.
![Outdoor Pool 01](https://hotspringers.net/ja/wp-content/uploads/sites/3/2021/10/hot-springs-state-park-bath-house05.jpg)
In the meantime, I run out the time and had to fade away.
I wished I could pay the fee and stay a bit longer.
![Soaking 01](https://hotspringers.net/ja/wp-content/uploads/sites/3/2021/10/hot-springs-state-park-bath-house11.jpg)
Summary
Hot Springs State Park Bath House, Thermopolis, Wyoming, U.S.
My rating
Type: Walk-in (free of charge)
Rule: Clothing required
Chemical use: Not detected
Water temp: Up to 135 degrees F