• Mammoth Hot Springs, Yellowstone - Yellowstone National Park, Wyoming

      Photo by Peter Thody
      The beautiful terraced structures of Mammoth Hot Springs (formed by calcium carbonate dissolved from the limestone rock, which solidifies as travertine), are among the most instantly recognizable features of Yellowstone National Park. Early visitors used to clamber onto the terraces to have their photographs taken, others would bathe in the waters. Today there are boardwalks leading visitors safely through the different levels. As the deposits build and grow 'in some places at a rate of 3 feet a year' so the course of the water changes, occasionally dramatically and within a matter of hours, creating an ever evolving natural sculpture.


      Grand Loop Road
      US Highway 89
      Yellowstone National Park, Wyoming 82190 USA

      Mailing address:
      P.O. Box 168
      Yellowstone National Park, WY 82190-0168

      Phone Numbers:

      Road Conditions (recording)
      +1 (307) 344-2117

      Visitor Information (recording)
      +1 (307) 344-7381

      Information for the Hearing Impaired (TDD)
      +1 (307) 344-2386