Crested Pool

Overview

Crested Pool is a standout hot spring in the Upper Geyser Basin near Old Faithful. Its hallmark is an elegant, “crested” sinter rim framing intensely clear, sapphire-blue water. The pool is almost constantly boiling at around 191°F (88.4°C), and vigorous bursts can occasionally send water a few feet into the air.

What You'll See

Expect a deep, open-mouthed spring (about 42 feet/12.8 meters) with striking clarity and a thin, raised rim. The center often churns with vigorous boiling, while cooler margins can wear warm-toned microbial rings. From spots along the boardwalk, you can also take in surrounding basin scenery, including the Firehole River in the distance.

How It Works (Hot Spring, Not Geyser)

Crested Pool is a hot spring with an open underground “plumbing” system. Superheated water rises freely to the surface, circulating continuously instead of building pressure for timed eruptions. That’s why it boils fiercely yet doesn’t behave like a predictable geyser. The deep blue color comes from sunlight scattering in the clear, hot water; extreme temperatures limit microbial growth, adding to the clarity.

Visiting Info

You’ll reach Crested Pool via the Upper Geyser Basin boardwalks from the Old Faithful area. There’s no dedicated parking or restroom at the feature—use the main Old Faithful lots and facilities before you set out. It’s an easy add-on to any loop through the basin’s marquee features.

Safety

Thermal areas are dangerous if you step off-route. Stay on boardwalks, supervise kids closely, and give all hydrothermal features plenty of space. Near- or above-boiling water can cause severe burns, and hot springs can suddenly splash.

Best Time to Visit

• Early morning or late afternoon: lighter crowds on the boardwalk and easier parking in peak season.
• Midday: the sun punches up the pool’s deep-blue color for photography.
• Cool mornings: steam can add drama, though it may soften color contrast.

Wildlife Note

Large animals generally avoid these extreme environments. The most “alive” parts right at the edges are thermophile mats—colorful microbes adapted to heat. Enjoy the colors from the boardwalk and keep your distance from any wildlife elsewhere in the basin.

Make It a Loop

Pair this stop with the rest of the Upper Geyser Basin. From the Old Faithful area, you can plan a relaxed boardwalk circuit and consult the visitor center for current eruption predictions to time nearby geysers.