Thermopolis Geothermal Terraces | Thermopolis

Information

Landmark: Thermopolis Geothermal Terraces
City: Thermopolis
Country: USA Wyoming
Continent: North America

Thermopolis Geothermal Terraces, Thermopolis, USA Wyoming, North America

The Thermopolis Geothermal Terraces are a series of mineral formations created by hot springs located in Thermopolis, Wyoming, USA.

These terraces are a significant geological feature within Hot Springs State Park.

Visual Characteristics

The terraces are composed of travertine, a form of calcium carbonate deposited by mineral springs. The formations exhibit a range of colors, primarily white, cream, and pale orange, due to mineral content and microbial activity. They are characterized by their tiered, stepped appearance, with water flowing over the edges to create new layers. The area features numerous hot springs and pools, some of which are actively steaming.

Location & Access Logistics

The Thermopolis Geothermal Terraces are situated within Hot Springs State Park, approximately 1 mile north of the town center of Thermopolis, Wyoming. Access is via State Highway 20. The park provides ample paved parking areas adjacent to the main terrace viewing sites. Public transport is not available directly to the terraces; visitors typically arrive by private vehicle.

Historical & Ecological Origin

The terraces are formed by the precipitation of calcium carbonate from the mineral-rich waters of the Big Spring, the largest hot spring in the park. The water originates from deep within the earth, heated geothermally and carrying dissolved minerals. The continuous flow and evaporation of this water over thousands of years have built the intricate travertine structures. The ecological system is supported by thermophilic (heat-loving) microorganisms that contribute to the coloration of the formations.

Key Highlights & Activities

Visitors can walk along designated boardwalks that provide close-up views of the terraces and active hot springs. Photography of the formations is a primary activity. Bathing in the state bath house, fed by the hot spring waters, is available. Hiking trails within Hot Springs State Park offer further exploration of the surrounding landscape.

Infrastructure & Amenities

Restrooms are available at the park entrance and near the bath house. Shaded areas are limited, primarily provided by park structures and natural rock formations. Cell phone signal (4G/5G) is generally available within the park. Food vendors are not present within the immediate terrace viewing areas, but are available in the town of Thermopolis.

Best Time to Visit

For photography, early morning or late afternoon light provides optimal illumination of the terrace colors. The best months for visiting are generally from May through October, when weather conditions are most favorable. The terraces are accessible year-round, but winter conditions may impact accessibility to some trails.

Facts & Legends

The Big Spring, which feeds the terraces, discharges approximately 8.5 million gallons of water per day at a constant temperature of 135°F (57°C). Local Native American tribes, including the Shoshone and Arapaho, have historically considered the hot springs to be sacred and a place of healing.