Water flows in crisscrossing patterns down a steep ridge where colorful thermophiles create a changing palette dominated by hues of orange and brown.
A network of fractures and fissures form the plumbing system that allows hot water from underground to reach the surface at Mammoth Hot Springs. Small earthquakes may keep the plumbing open. The water comes from rain and snow falling on surrounding mountains and seeping deep into the earth where it is heated. The volcanic heat source for Mammoth Hot Springs remains somewhat of a mystery. Scientists have proposed two sources: the large magma chamber underlying the Yellowstone Caldera or a smaller heat source closer to Mammoth.
For hundreds of years, Shoshone and Bannock people collected minerals from the Mammoth Hot Springs terraces for white paint.
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