United States UGB - Crested Pool

2 images 2 contributors

Lewis Kemper

About this spot
Chromatic Pool is one of the most beautiful springs in the Upper Geyser Basin. It is a very hot spring with water temperature around 200º F (93.3º C). The spring is 25x30 feet (7.64 x 9.14 m) with a depth of 42 feet (12.8 m). It is this deep depth that makes it appear so blue in color. The whole rim of the pool is covered with an upward angled crust of gray sinter, giving the pool its name. The bright orange color is cyanobacteria that grow in the water, as it cools from the center of the pool. In general, the cooler the temperature of the water, the deeper the color of the cyanobacteria.

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