Bijou Geyser

Grotto Geyser is a fountain-type geyser located in the Upper Geyser Basin in Yellowstone National Park in the United States. Grotto Geyser is the namesake for the group of geysers that includes Grotto Fountain Geyser, South Grotto Fountain Geyser, Indicator Spring, Spa Geyser, Startling Geyser, and Rocket Geyser.

Chromatic Spring is a hot spring in the Upper Geyser Basin of Yellowstone National Park in the United States. It is connected to the nearby Beauty Pool. When the water level in one of the two pools rises and overflows, the water level in the other decreases. These fluctuations in water level take place over periods ranging from a few weeks to several years. During this energy shift, the temperatures can change about 10 °F (5.6 °C). Its temperature ranges from 164 to 175 °F (73 to 79 °C).

Beauty Pool is a hot spring in the Upper Geyser Basin of Yellowstone National Park in the United States. It is connected to the nearby Chromatic Spring. When the water level in one of the two pools rises and overflows, the water level in the other decreases. These fluctuations in water level take place over periods ranging from a few weeks to several years. During this energy shift, the temperatures can change about 10 °F. Its temperature ranges from 164 to 175 °F (73 to 79 °C)

Fan and Mortar Geysers are two geysers in the Upper Geyser Basin in Yellowstone National Park. For the past several decades, they have erupted in concert with one another and are generally talked about together. The records detailing these geysers' known eruptive history shows that they have been infrequent and irregular performers.

Comet Geyser is a geyser in the Upper Geyser Basin of Yellowstone National Park in the United States. Comet Geyser is part of the Daisy Group which includes Daisy Geyser, Splendid Geyser and Brilliant Pool. As opposed to the other features in this group, Comet erupts almost continuously. Every few minutes it surges to a height of 6 feet (1.8 m). This constant eruption has led to it having the biggest sinter cone of any of the geysers in this group.Comet might be interconnected with Daisy and Splendid Geysers, albeit to a lesser degree than Brilliant Pool. After an eruption of Splendid and sometimes after Daisy, the action of Comet slows but quickly returns to its normal level.Comet Geyser was named by the Hague Party in 1904.

Brilliant Pool is a hot spring in the Upper Geyser Basin of Yellowstone National Park in the United States. Brilliant Pool is part of the Daisy Group and is interconnected with the Daisy and Splendid Geysers. Prior to an eruption by Daisy or Splendid, the pool is filled.When Daisy erupts, the water level in Brilliant Pool drops a few inches then is refilled as Daisy refills. A Splendid eruption has a larger effect on Brilliant Pool, dropping the level lower than a Daisy eruption. On occasion, Splendid will have a series of eruptions, preventing Brilliant Pool from refilling completely before the next eruption. In the event of a sustained series of Splendid eruptions or a dual Daisy/Splendid eruption, the water level in Brilliant Pool may drop low enough that it will have its own eruptions. These eruptions are short, usually lasting a few seconds, spaced a few minutes apart. The size of the fountain can reach as much as 15 feet but usually just breaks the surface of the pool. Most of the time, the two geysers influence the behavior of the pool. On occasion, however, the pool can have an effect on a geyser. In the early 1950s, Brilliant Pool experienced a phase where it was overflowing. During this time, Daisy was dormant until the pool returned to its normal behavior.

Splendid Geyser is a geyser in the Upper Geyser Basin of Yellowstone National Park in the United States. Splendid Geyser is part of the Daisy Group. Its eruptions are infrequent and unpredictable, unless it is active. When it does erupt, its fountain can reach a height of 200 feet (60 m). Eruptions are more likely if a storm front reduces barometric pressure and lowers the boiling point of water around the geyser. Splendid’s eruptions are very rare with intervals between eruptions lasting decades. In the early to mid 1970s, the geyser was very active. Splendid came alive again in 1992. Splendid Geyser was last active in 1998. Eruptions last between 1 and 9 minutes. Splendid Geyser is closely linked to Daisy Geyser. Most often, when Daisy is active, Splendid is inactive. In times when Daisy goes dormant, Splendid becomes very active. In rare occasions, both geysers will be active at the same time, leading to a "dual eruption". During a concert (dual) eruption Daisy and Splendid are both much stronger than usual. Then Splendid erupts to about 250 feet, The dual eruptions last from 30 to 120 minutes.Splendid Geyser has not erupted since May 13, 1998.

Economic Geyser is a geyser in the Upper Geyser Basin of Yellowstone National Park in the United States. Economic Geyser is a small, usually inactive geyser located between the Giant Geyser group and the Grand Geyser group. Economic Geyser was once a popular, frequently-erupting geyser until it became essentially dormant in the 1920s. Economic Geyser is believed to be named for its behavior during its active days. It is reported that most of the water ejected drained back into the vent after the eruption, thus making the geyser appear to conserve its water. It was most likely named by Frank Jay Haynes, the park photographer from 1883-1916. The temperature of the water in geyser pools and other geothermal features can be judged by the color of the bacteria living in the water. Changes in the size and color of bacteria mats at Economic Geyser imply that the geyser is heating up. Photographs of the geyser vent taken in the 1990s show a quiet pool very dark with algae. Photographs of the vent taken in 2006 show a pool of clear water with traces of the bacterial colors associated with higher temperatures.

Daisy Geyser is a geyser in the Upper Geyser Basin of Yellowstone National Park in the United States. Daisy Geyser is part of the Daisy Group. It was named prior to 1890 by the Hague Party. It erupts every 110 to 240 minutes for a period of 3 to 5 minutes and is one of the most predictable geysers in the park. Its fountain erupts at an angle to the ground and reaches a height of 75 feet (23 m). The interval between eruptions can be temporarily altered by an eruption of nearby Splendid Geyser. To a smaller degree, Brilliant Pool and Comet Geyser are influenced by Splendid and Daisy.Daisy Geyser was one of the Yellowstone geysers that had its eruption interval disrupted by the 2002 Denali earthquake, in Alaska. Immediately after the quake, the interval rapidly decreased but returned to previous intervals over the course of a few weeks.

Vent Geyser is a geyser in the Upper Geyser Basin of Yellowstone National Park in the United States. Vent Geyser belongs to the Grand Group (or Grand Geyser Complex), and its eruption is tied to Grand Geyser. Normally, it erupts immediately after Grand and continues to erupt intermittently for about an hour afterward along with Turban Geyser. On rare occasions, it has erupted before Grand or completely by itself. Its fountain reaches a height of 75 feet (23 m) initially then subsides to 20 to 40 feet (6–12 m). At times, it is not possible to see Vent erupting through the steam and spray of Grand Geyser.

Bulger Geyser is located in the Upper Geyser Basin of Yellowstone National Park, Wyoming. Bulger Geyser is 200 feet (61 m) south of Grand Geyser. It erupts frequently, with both major and minor eruptions. As with most geysers, the minor eruptions are the most common. They have a duration of seconds. Major eruptions are infrequent, but they have durations as long as 12 minutes. Either way, the play consists of somewhat vigorous bursting 1–12 feet high.

Belgian Pool is a hot spring in the Upper Geyser Basin of Yellowstone National Park, Wyoming. Originally named Oyster Spring, it was renamed after a visitor from Belgium fell into it in 1929 with fatal results. The spring is less hot than other features in the area, at about 180 °F (82 °C), but still sufficiently hot for severe thermal burns. References to a "Belgian Geyser" in the 1930s may refer to this feature.