Big Spring Source Pool | Thermopolis

Information

Landmark: Big Spring Source Pool
City: Thermopolis
Country: USA Wyoming
Continent: North America

Big Spring Source Pool, Thermopolis, USA Wyoming, North America

The Big Spring Source Pool is a natural hot spring located in Thermopolis, Wyoming, USA.

It is the primary source of the hot mineral water that feeds the Hot Springs State Park.

Visual Characteristics

The pool itself is a large, shallow basin with a diameter of approximately 50 meters. The water exhibits a milky turquoise coloration due to dissolved minerals. The edges are lined with travertine deposits, forming layered, off-white formations. Surrounding vegetation consists of sparse desert grasses and hardy shrubs.

Location & Access Logistics

The Big Spring Source Pool is situated within Hot Springs State Park, directly adjacent to the town of Thermopolis. Access is via State Highway 20, which runs through the park. Parking is available at designated lots near the park entrance and the bathhouse facilities. Public transport to Thermopolis is limited; the nearest major airport is in Cody (COD), approximately 80km East.

Historical & Ecological Origin

The Big Spring Source Pool is a geothermal feature, formed by the upward movement of heated groundwater through fault lines in the Earth's crust. The water is heated by the Earth's internal temperature and dissolves minerals as it travels to the surface. The travertine deposits are a result of the precipitation of dissolved calcium carbonate from the mineral-rich water.

Key Highlights & Activities

Observation of the spring's outflow is the primary activity. Visitors can walk along the paved pathways surrounding the pool. Bathing is permitted in designated areas downstream at the state bathhouse, which utilizes the spring water. Fishing is permitted in the Bighorn River, which flows adjacent to the park.

Infrastructure & Amenities

Restrooms are available at the Hot Springs State Park bathhouse and visitor center. Shaded picnic areas are located throughout the park. Cell phone signal (4G/5G) is generally available within the park boundaries. Food vendors are not present within the immediate vicinity of the spring; dining options are available in Thermopolis.

Best Time to Visit

For photography, early morning or late afternoon provides optimal lighting conditions, minimizing glare on the water's surface. The best months for weather are May through September, with average daytime temperatures ranging from 20-30 degrees Celsius. The spring's flow is consistent year-round and is not affected by tides.

Facts & Legends

Local Native American tribes, including the Shoshone and Arapaho, have historically utilized the hot springs for their perceived medicinal properties. A specific legend recounts that the waters possess restorative powers, capable of healing ailments.