The Grand Prismatic Spring is the largest hot spring in Yellowstone and the third largest in the world (after Frying Pan Lake in New Zealand and Boiling Lake in Dominica). The spring was first observed by geologists in 1871 and was named for its striking coloration, matching most of the colors seen in light dispersed by an optical prism: red, orange, yellow, green, and blue.
We first view the spring from a viewpoint at the Midway Geyser Basin, along the Fairy Falls Trail, then head over to walk on the boardwalk through the spring itself.
Fairy Falls Trailhead
Looking over at the Grand Prismatic Spring
We park along the road at the Grand Prismatic Spring (parking lots are full) and walk over to the boardwalks that loop through the area.
Approaching the spring
The bright, vivid colors in the spring are the result of sunlight being scattered by mineral particles in the water. The spring often appears to have a blue haze hovering over it, caused by the steam reflecting from the blue of the water. Bright orange heat-loving bacteria known as thermophiles populate the run-off channels. These microbes contain colorful pigments that allow them to make energy from sunlight and thrive in the hot conditions of the spring.
Walking across the spring
Opal Pool
Turquoise Pool
What an incredible sight!
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