Ranger Sarah views Orange Spring Mound. This spring flows from vents from its top and side. Orange Mound Spring is thermally cooler (~170˚F) than most springs in Yellowstone and at the Mammoth Hot Springs themselves, allowing the orange-tinted cyanobacteria to thrive and color the spring a darker shade of orange than the rest of the Mammoth Terraces. Depending on the nutrients that the bacteria receive, the color may change throughout the year
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