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Morning Glory Pool

  • Mammoth Hot Springs
  • Grand Prismatic
  • Morning Glory Pool
  • Handkerchief Pool
  • Hot Spring Colors
  • Unfortunately, vandalism to Morning Glory Pool began early. The spring originally had a scalloped sinter border, 6-10 inches (15-25 cm) wide and 2-5 inches (5-13 cm) high. The entire rim was dismantled by souvenir hunters. By the 1950s, people had thrown so much trash, rocks, logs, and coins into the spring that Morning Glory Pool became known informally as the "garbage can."

    Morning Glory PoolMuch of the debris became embedded in the sides and vent of the spring, affecting water circulation and decreasing the water temperature. Consequently, yellow and orange microorganisms, previously unable to live in hotter water, have spread towards the center of the pool, decreasing the area of clear blue.

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    This work is supported by

    National Science Foundation    Yellowstone Park Foundation

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