Old Faithful is a cone geyser in Yellowstone National Park in Wyoming, United States. It was named in 1870 during the Washburn–Langford–Doane Expedition and was the first geyser in the park to be named. It is a highly predictable geothermal feature and has erupted every 44 minutes to two hours since 2000. The geyser and the nearby Old Faithful Inn are part of the Old Faithful Historic District.
The geothermal areas of Yellowstone include several geyser basins in Yellowstone National Park as well as other geothermal features such as hot springs, mud pots, and fumaroles. The number of thermal features in Yellowstone is estimated at 10,000. A study that was completed in 2011 found that a total of 1,283 geysers have erupted in Yellowstone, 465 of which are active during an average year. These are distributed among nine geyser basins, with a few geysers found in smaller thermal areas throughout the Park. The number of geysers in each geyser basin are as follows: Upper Geyser Basin (410), Midway Geyser Basin (59), Lower Geyser Basin (283), Norris Geyser Basin (193), West Thumb Geyser Basin (84), Gibbon Geyser Basin (24), Lone Star Geyser Basin (21), Shoshone Geyser Basin (107), Heart Lake Geyser Basin (69), other areas (33). Although famous large geysers like Old Faithful are part of the total, most of Yellowstone's geysers are small, erupting to only a foot or two. The hydrothermal system that supplies the geysers with hot water sits within an ancient active caldera. Many of the thermal features in Yellowstone build up sinter, geyserite, or travertine deposits around and within them.
Castle Geyser is a cone geyser in the Upper Geyser Basin of Yellowstone National Park. It is noted for the particularly large geyserite sinter deposits, which form its cone. These deposits have been likened in appearance to a castle.
Turban Geyser is a geyser in the Upper Geyser Basin of Yellowstone National Park in the United States.
Spindle Geyser is a geyser in the Lower Geyser Basin of Yellowstone National Park in the U.S. state of Wyoming.
Botryoidal Spring is a fountain-type geyser in the Lower Geyser Basin of Yellowstone National Park in the United States.
Dilemma Geyser is a geyser in the Lower Geyser Basin of Yellowstone National Park in the United States. It is part of the Pink Cone complex. Other geysers in this group are Bead Geyser, Box Spring, Labial Geyser, Labial's Satellite Geyser, Narcissus Geyser, Pink Geyser, and Pink Cone Geyser.
Labial Geyser is a fountain-type geyser in the Lower Geyser Basin of Yellowstone National Park in the United States. It is part of the Pink Cone Group. Other geysers in this groups are Labial's Satellite Geyser, Bead Geyser, Box Spring, Dilemma Geyser, Narcissus Geyser, Pink Geyser, and Pink Cone Geyser.
Narcissus Geyser is a geyser in the Lower Geyser Basin of Yellowstone National Park in the United States. Narcissus Geyser is part of the Pink Cone Group. Other geysers in this group are Bead Geyser, Box Spring, Dilemma Geyser, Labial Geyser, Labial's Satellite Geyser, Pink Geyser, and Pink Cone Geyser.
Pink Geyser is a fountain-type geyser in the Lower Geyser Basin of Yellowstone National Park in the United States.
Pink Cone Geyser is a cone-type geyser in the Lower Geyser Basin of Yellowstone National Park in the United States. It is part of the Pink Cone Group. Other geysers in this groups include Bead Geyser, Box Spring, Dilemma Geyser, Labial Geyser, Labial's Satellite Geyser, Narcissus Geyser, and Pink Geyser.
Excelsior Geyser Crater, formerly known as Excelsior Geyser, is a dormant fountain-type geyser in the Midway Geyser Basin of Yellowstone National Park in the United States. Excelsior was named by the Hayden Geological Survey of 1871.
Beehive Geyser is a geyser in the Upper Geyser Basin of Yellowstone National Park in the United States. The 4-foot (1.2 m) tall cone resembles a straw beehive. Beehive's Indicator is a small, jagged cone-type geyser located about 10 feet (3.0 m) from Beehive.
Fountain Geyser is a geyser in the Lower Geyser Basin of Yellowstone National Park in the United States.
Jet Geyser is a geyser in the Lower Geyser Basin of Yellowstone National Park in the United States. Jet Geyser is in the Fountain Group that includes Fountain Geyser, Morning Geyser, Red Spouter and Silex Spring.
White Dome Geyser is a geyser located in the Lower Geyser Basin in Yellowstone National Park in the United States.
Lone Star Geyser is a cone type geyser located in the Lone Star Geyser Basin of Yellowstone National Park. The basin is a backcountry geyser basin located 3 miles (4.8 km) southeast of Old Faithful Geyser and the Upper Geyser Basin. The geyser is reached via an old service road open to hikers and biking with the trailhead near Kepler Cascades on the Grand Loop Road.
Giantess Geyser is a fountain-type geyser in the Upper Geyser Basin of Yellowstone National Park. It is known for its violent and infrequent eruptions of multiple water bursts that reach from 100 to 200 feet. Eruptions generally occur 2 to 6 times a year. The surrounding area may shake from underground steam explosions just before the initial water and/or steam eruptions. Eruptions may occur twice hourly, experience a tremendous steam phase, and continue activity for 4 to 48 hours. The Geyser last erupted on August 26, 2020 after a six year, 210 day hiatus. A follow up eruption occurred 15 days later on 10 September 2020. Another eruption occurred on 11 August 2021
Shoshone Lake is a U.S. backcountry lake with an area of 8,050 acres with an elevation of 7,795 feet (2,376 m) in the southwest section of Yellowstone National Park, Wyoming. It lies at the headwaters of the Lewis River, a tributary of the Snake River. The U.S. Fish and Wildlife Service believes that Shoshone Lake is the largest backcountry lake in the lower 48 states that cannot be reached by a road. The Yellowstone Caldera is located within the lake.
Opal Pool is a hot spring in the Midway Geyser Basin of Yellowstone National Park, Wyoming. Opal Pool usually has a temperature of approximately 132 °F (56 °C). Though usually active as a hot spring, Opal Pool is considered a fountain-type geyser.
