Soda Springs Geyser - The Only Captive Geyser in the World

Tucked away in the small town of Soda Springs, Idaho, you'll find one of the most unique geothermal wonders on the planet - the world's only captive geyser.

Unlike natural geysers that erupt unpredictably, this one is carefully controlled by a man-made valve.

It all started in 1937 when drillers searching for a hot water source accidentally tapped into a pressurized chamber of carbonated water deep underground.

The sudden release created a roaring column of water, shooting over 100 feet into the air. To protect the town from flooding, the flow was capped, turning the geyser into a rare, human-controlled marvel.

Today, the Soda Springs Geyser erupts on demand every hour, delighting visitors with a plume of steaming water that dances high against the Idaho sky.

The eruption lasts several minutes, and the experience is made even better by the surrounding park, which offers picnic tables, grassy areas, and interpretive signs explaining the science and history of the geyser.

The constant presence of naturally carbonated mineral water in the region also explains the town's name, as "Soda Springs" refers to the abundance of fizzy springs bubbling from the ground.

The geyser sits along the scenic Oregon Trail route, making it a fun and educational stop for road-trippers, history buffs, and families.

Soda Springs Geyser History

Long before the geyser was discovered, the region's naturally carbonated springs drew Native Americans and early settlers, who believed the waters had healing properties.

The Soda Springs Geyser's story began in 1937, when workers drilling for a swimming pool accidentally tapped into an underground chamber of pressurized carbon dioxide.

The gas, trapped beneath layers of rock, forced water to surge upward in a powerful, unexpected eruption. Rather than sealing it, the town installed a timed release valve, turning this geological surprise into a controlled attraction that erupts every hour on the hour.

Over the decades, it has become a proud symbol of Soda Springs, drawing visitors from around the world to witness the only captive geyser of its kind.

What Does an Eruption Feel Like?

About a minute before it blows, you'll hear a deep gurgling sound like a coffee pot on overdrive. Then, whoosh! a towering jet of water rockets upward, mist drifting down like warm rain. On sunny days, tiny rainbows form in the spray.

It's strangely satisfying knowing the exact minute the magic will happen - kind of like counting down to New Year's Eve, but with more steam.

Fun Facts About Soda Springs Geyser

It's the only geyser in the world operated by a timer.
The eruption is free to watch, and there's no entrance fee.
The water has a faint soda-water tang due to dissolved CO₂.
The geyser can run continuously for hours if the valve is left open.
In winter, the spray freezes into dazzling ice formations.

Tips for Your Visit

Arrive a few minutes before the hour so you don't miss it.

Bring a camera - rainbows in the mist make for epic shots.

Bundle up in winter; the steam is warm, but the Idaho air can be icy.

Try the local mineral water at Hooper Springs. It's bubbly and naturally flavored.

The Soda Springs area offers plenty more to explore. Lava Hot Springs, 22 miles north, is a year-round destination famous for its soothing natural mineral pools.

You'll find everything from cozy soaking tubs to large outdoor pools with mountain views - perfect for relaxing after a day of sightseeing.

The Lava Hot Springs World Famous Hot Pools are just a short walk away, offering five pools with varying temperatures for the perfect soak.

The Portneuf River runs through town - rent a tube and float the river, or try fishing and kayaking.

The Lava Hot Springs Olympic Swimming Complex features indoor and outdoor pools, water slides, and family fun.