Mammoth Hot Springs

Mammoth Hot Springs  Although it rained all morning, as we stopped for lunch outside Mammoth Hot Springs, the clouds began to part and beautiful rays of sun provided a picture perfect view as we dined.  Mammoth Hot Springs, in the northwestern part of Yellowstone NP, is a large complex of hot springs on a mound of travertine, a form of limestone, created over thousands of years as hot water from the spring cooled and deposited calcium carbonate.  The spring’s energy  comes from the same magmatic system that fuels other Yellowstone geothermal areas.  The hot water that feeds Mammoth comes from Norris Geyser Basin after traveling underground via a fault line.  The water temperature at the spring hovers at about 170 °F (80 °C).  Algae living in the warm pools have tinted the travertine shades of brown, orange, red, and green.