Monument Geyser Basin
Monument Geyser Basin emerges at 197 degrees Fahrenheit at 7,320 feet elevation, requiring a 650-meter uphill hike from Grand Loop Road. Recent USGS analysis measured 90.7 degrees Celsius with high sodium (407 mg/L) and chloride (562 mg/L) concentrations. The water runs 164 degrees above ambient.
The basin occupies a steep thermal hillside above the Gibbon River where annual snowfall reaches 123 inches and precipitation totals nearly 26 inches. Cone-shaped sinter deposits give the area its name, with weathered thermal features scattered across the slope in lodgepole pine forest.
Hike between June and September when snow clears the moderately strenuous uphill trail. Elevation gain and uneven footing require fitness and appropriate footwear. Indian Creek Campground, 22.6 kilometers away, provides the nearest base camp. Allow two hours round-trip from the trailhead.
The basin gained recognition from early Yellowstone explorers documenting the park's thermal features. The eroded cones represent dormant or dying geysers, with the area seeing minimal human development beyond trail construction. The site remains in permanent protection under National Park Service management.
The water at Monument Geyser Basin is slightly acidic (pH 6.7). It is notably rich in sodium (supports circulation and skin hydration) and chloride (natural antiseptic with skin health benefits).
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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...
Monument Geyser Basin sits at 7,320 feet above sea level, way above the mile-high mark. You may not feel the altitude strongly, but hot water still dehydrates you faster at elevation. UV is about 29% stronger than at sea level, so bring sunscreen and drink more water than you normally would.
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Monument Geyser Basin is road-accessible, so you can bring more gear. The water is dangerously hot — bring water shoes and test pools carefully. Cold air temperatures make a changing robe or warm layers essential.
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