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Midway Geyser Basin - Yellowstone National Park

This basin is home to two of the largest geothermal features in Yellowstone: Grand Prismatic Spring & Exelsior Geyser.
Rating: 5 out of 5 by EveryTrail members
Difficulty: Easy
Length: 0.8 miles
Duration: Less than 1 hour
Family Friendly

Overview:  Midway Geyser Basin is much smaller than the other basins found alongside the Firehole River. Despite its small size, it contains two ... more »

Tips:  Hydrothermal features are fragile rarities of nature. Yellowstone preserves the largest collection of hydrothermal features on the... more »

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Points of Interest

1. Turquoise Pool

Take the right fork and proceed to Turquoise Pool, which will be on your right. The 1878 Hayden Expedition named this pool for its milky, white bottom and gem-like, blue-colored water. Suspended mineral particles in the water also add an opalescent iridescence. Turquoise has no apparent overflow channel; instead water drains through seepage. There... More

2. Opal Pool

Further to the west is Opal Pool. Opal Pool is a hot spring in the Midway Geyser Basin of Yellowstone National Park. Opal Pool usually has a temperature of approximately 132 °F. Though usually active as a hot spring, Opal Pool is considered a fountain-type geyser.

The first recorded eruption of Opal Pool was in 1947, recurring in 1949, 1952 and... More

3. Grand Prismatic Spring

Grand Prismatic Spring is the largest hot spring in Yellowstone and is considered to be the third largest hot spring in the world. New Zealand has the two largest springs. Grand Prismatic sits upon a wide, spreading mound where water flows evenly on all sides forming a series of small, stair-step terraces. The Hayden Expedition in 1871 named this ... More

4. Excelsior Geyser Crater

Excelsior Geyser was once the largest geyser in the world. However, the last known major eruptions occurred during the 1880s, when there were numerous eruptions up to 300 feet. The violent eruptions of the 1880s may have caused damage to the siliceous sinter lining, allowing gas leakage and the loss of thermal energy. No observed eruptions were... More