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Kelly Warm Springs in Grand Teton National Park. The Springs lie along a fault line on the east side of Jackson Hole. The water enters the aquifer high in the Gros Ventre Mountains and flows down the strata until it get deep below the Jackson Hole valley floor. During its trip, the water is heated by the natural geothermal heat. It then rises to the surface along faults and forms the Kelly Warm Spring, with water temps around 85°F. Yay #geology!!
Unique fact - the spring has been the target for illegal dumping of tropicsl aquarium fish for decades, including swordtails, convict cichlids, guppies, goldfish, and tadpole madtoms. These nonnative species are harmful to native fish, so the NPS is considering ecologically safe ways to remove them. at Kelly, Wyoming