Excelsior Geyser Crater, formerly known as Excelsior Geyser, is a hot spring in the Midway Geyser Basin of Yellowstone National Park in the United States. Excelsior was named by the Hayden Geological Survey of 1871. Possibly the only known photograph of Excelsior in full eruption was taken by Frank Jay Haynes in 1888. The Excelsior Geyser pool discharges 4,000 to 4,500 gallons (15,100–17,000 l) of 199 °F . of water per minute directly into the Firehole River.
