Grand Prismatic Spring

The Grand Prismatic Spring in Yellowstone National Park is the largest hot spring in the United States, and the third largest in the world, after Frying Pan Lake in New Zealand and Boiling Lake in Dominica. It is located in the Midway Geyser Basin.

Grand Prismatic Spring was noted by geologists working in the Hayden Geological Survey of 1871, and named by them for its striking coloration. Its colors match most of those seen in the rainbow dispersion of white light by an optical prism: red, orange, yellow, green, and blue.

The first records of the spring are from early European explorers and surveyors. In 1839, a group of four trappers from the American Fur Company crossed the Midway Geyser Basin and made note of a "boiling lake", most likely the Grand Prismatic Spring,[1] with a diameter of 300 feet (90 m). In 1870 the Washburn–Langford–Doane Expedition visited the spring, noting a 50-foot (15 m) geyser nearby (later named Excelsior).[2][3]

^ ""The Fire Hole": Era of the American Fur Company, 1833-1840". Colter's Hell & Jackson's Hole. National Park Service. Archived from the original on 2005-03-12. ^ "Notes". Yellowstone National Park: Its Exploration and Establishment. National Park Service. Archived from the original on 2006-02-08. ^ "Part II: Definitive Knowledge - The Washburn Party (1870)". Yellowstone National Park: Its Exploration and Establishment. National Park Service. Archived from the original on 2004-12-13.
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