# Semi Centennial Geyser, Wyoming

Semi Centennial Geyser in Wyoming. 198°F (92°C). Roadside · Public Land. Gallatin County.

- Page: https://www.soakingsprings.com/hot-springs/wyoming/semi-centennial-geyser
- Source: Soaking Springs, researched and maintained by Armen Suny
- Updated: 2026-09-14

## Can you soak at Semi Centennial Geyser?

No. The water at Semi Centennial Geyser reaches 198°F, hot enough to scald.

## Key facts

| Fact | Value |
|---|---|
| Source water temperature | 198°F (92°C) (USGS record; developed pools are often cooled) |
| pH | 6.0 (Slightly Acidic) |
| Elevation | 7,540 ft |
| Access | Roadside · Public Land, 113 ft from the nearest road (Grand Loop Road) |
| Land | Yellowstone National Park, National Park Service |
| County | Gallatin County |
| Nearest town | West Yellowstone |
| Coordinates | 44.78600, -110.74000 |
| Best months to soak | December, January, February (largest gap between water and average air temperature) |
| Nearest campground | Indian Creek Campground (WY), 7.0 mi |

## Soaking safety

**Geyser: Not a Soaking Spring.** Semi Centennial Geyser is a geyser, not a traditional hot spring. These geothermal features can be extremely dangerous. Boiling water, toxic gases, and unstable ground are common hazards. Do not attempt to soak.

## About Semi Centennial Geyser

Semi Centennial Geyser is a roadside geyser in Yellowstone, about a hundred feet off the Grand Loop Road. Near-boiling water on record, with a USGS site number and a chemistry sample from 2007. Gallatin County, Park Service land, open. West Yellowstone is the town on file as nearest. A geyser, so it is there to be watched.

Pull off the Grand Loop Road and it is right there, a hundred-odd feet away. Elevation around 7,500 feet. Cold climate on record, an annual average of 35, and snow running close to eleven and a half feet. Precipitation moderate. Protected national park land. Nothing is on file about the geyser's eruption pattern.

A USGS site record exists for this geyser, with water chemistry sampled in September 2007.

Near-boiling. Keep back from the vent and any runoff. The best months listed are the dead of winter, so confirm the Grand Loop Road is open before driving to it. Indian Creek Campground, seven miles off, is the closest camp on record. No fee listed.

## Water chemistry

Lab sample from 2007-09-18 (Water Quality Portal).

| Measure | Value |
|---|---|
| pH | 6 |
| Calcium | 4.9 mg/L |
| Magnesium | 0.6 mg/L |
| Sodium | 5.49 mg/L |
| Sulfate | 1.5 mg/L |
| Chloride | 0.5 mg/L |

## Nearby

- Nearest city page: [Hot springs near Cody](https://www.soakingsprings.com/hot-springs/near/wyoming/cody), 79 mi away
- State page: [Hot springs in Wyoming](https://www.soakingsprings.com/hot-springs/wyoming)
- [Steam Vents At Roaring Mountain, WY](https://www.soakingsprings.com/hot-springs/wyoming/steam-vents-at-roaring-mountain): Hot, pH 6.0, Short Walk, near West Yellowstone, Gallatin County
- [Amphitheater Springs, WY](https://www.soakingsprings.com/hot-springs/wyoming/amphitheater-springs): 196°F source, pH 6.0, Short Walk, near West Yellowstone, Gallatin County
- [Bijah Spring, WY](https://www.soakingsprings.com/hot-springs/wyoming/bijah-spring): 198°F source, pH 5.4, Roadside, near West Yellowstone, Gallatin County
- [Whiterock Springs, WY](https://www.soakingsprings.com/hot-springs/wyoming/whiterock-springs): 144°F source, pH 6.7, Hike, near West Yellowstone, Gallatin County
- [Roadside Springs, Frying Pan Spring, WY](https://www.soakingsprings.com/hot-springs/wyoming/roadside-springs-frying-pan-spring): 158°F source, pH 4.7, Roadside, near West Yellowstone, Gallatin County
- [Gas Vent, WY](https://www.soakingsprings.com/hot-springs/wyoming/gas-vent-2): Hot, pH 4.7, Roadside, near West Yellowstone, Gallatin County

## Questions

**What is the water temperature at Semi Centennial Geyser?**
Semi Centennial Geyser has a water temperature of 198°F (92°C). This is considered a hot spring, well above body temperature.

**Where is Semi Centennial Geyser located?**
Semi Centennial Geyser is located in Gallatin County, Wyoming at 7,540 feet elevation, near West Yellowstone. Coordinates: 44.7860°N, 110.7400°W.

**How do I get to Semi Centennial Geyser?**
Semi Centennial Geyser has Roadside road access, with the nearest road being Grand Loop Road (113 ft from the road).

**Is Semi Centennial Geyser free to visit?**
Semi Centennial Geyser has Open access. It is managed by National Park Service.

**Can I camp near Semi Centennial Geyser?**
Yes, Indian Creek Campground (Wy) is located nearby (7.0 miles away).

**What minerals are in the water at Semi Centennial Geyser?**
Water chemistry analysis shows the presence of pH, Calcium, Magnesium, Sodium, Sulfate, Chloride. The pH is 6.0 (slightly acidic).

**Is it safe to soak at Semi Centennial Geyser?**
No, not at the source. The water at Semi Centennial Geyser reaches 198°F, which can cause severe burns within seconds. Look for cooled side pools or downstream stretches, and test with a hand before anything else.

## Sources

- USGS thermal springs records, Water Quality Portal lab analyses, OpenStreetMap, Wikipedia/Wikidata, NOAA climate normals