Heart Spring, Upper Geyser Basin, temperature > 190 degrees Fahrenheit
Belgian Pool, Upper Geyser Basin, temperature ~ >150 degrees Fahrenheit
Did you know that the colors of the beautiful hot springs you see at Yellowstone National Park indicate the water temperature? Make no mistake, you do NOT want to soak in any of these after a long day hiking. Rule of thumb: the bluer the H2O, the hotter it is. And the orange, yellow, and brown colors you see ringing the springs and leading away from them are thermophilic (heat loving) bacteria.
Copyright Rebecca L. Latson, all rights reserved.
Where The Trails Take You Photography 
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