Unnamed Thermal Spring
Big Alcove Spring reaches 201°F in Yellowstone's Norris Geyser Basin at 7,510 feet elevation, making it one of the park's hottest features with water exceeding the local boiling point. Recent USGS analysis shows acidic pH 4.5 and extreme chloride levels of 601 mg/L, indicating deep geothermal circulation. Located 402 meters from Grand Loop Road, the spring runs 166 degrees above ambient temperature.
Big Alcove Spring sits within Norris Geyser Basin's back basin area at 7,510 feet, surrounded by barren silica platforms and sulfur-stained ground characteristic of acid-sulfate thermal features. The basin occupies a forested valley with lodgepole pine covering surrounding slopes and the Gallatin Range visible to the northwest. Annual snowfall averages 137 inches, with heavy accumulation from November through April. Thermal runoff channels drain toward the Gibbon River drainage system. The spring requires a quarter-mile walk from the nearest parking area along maintained boardwalks that protect the fragile sinter formations.
Big Alcove Spring was formally named and documented in early Yellowstone geothermal surveys, with 1996 measurements recording 198.3°F water temperature. The name likely references the spring's recessed position within a thermal alcove feature. Norris Geyser Basin has been studied intensively since the 1870s due to its extreme temperatures and dynamic hydrothermal behavior. The National Park Service maintains the spring under permanent federal protection with no development beyond visitor access infrastructure.
Visit between late May and early October when Norris boardwalks are open. Expect subfreezing temperatures and possible snow even in summer at this elevation. Stay on designated boardwalks; the acidic water and superheated steam cause severe burns, and thermal ground collapses without warning. The extreme chloride chemistry reflects deep circulation in Yellowstone's geothermal plumbing system. Indian Creek Campground, 18.5 kilometers north, provides the nearest developed camping with advance reservations required.
Is this spring worth visiting?
Best for
- Viewing dramatic geothermal features
- Overnight camping trips
- Winter soaking with dramatic temperature contrast
Not ideal for
- Swimming or soaking
The water at This spring is acidic (pH 4.5). It is notably rich in sodium (supports circulation and skin hydration) and chloride (natural antiseptic with skin health benefits).
Overview Located about eight miles (13 km) south of Mammoth Hot Springs on the road to Norris, Indian Creek Campground—elevation 7,300 feet (2225 m)—sits near the base of the Gallatin Mountains and offers breathtaking views of Electric Peak. The area offers easy access to fishing and hiking. The campground is away from the main road and provides a quieter, more primitive, experience than many other locations. For reservations at the campgrounds managed by Yellowstone National Park Lodges (Fi...