YNP Thermal Feature: Grand Geyser

Thermal Map; Firehole River Drainage (Map) -> Upper Geyser Basin (Map) -> Grand Group -> Grand Geyser


Enlarge		Credit: NPS

Approximate Location of Grand Geyser:

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Grand Geyser
YNP Thermal Inventory ID: UGrG001
Lat: 44.4666527
Lon: -110.8368901
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An eruption of Grand Geyser, the tallest predictable geyser in the world, occurs every 7 - 15 hours. A classic fountain geyser, Grand erupts from a large pool with powerful bursts rather than a steady column like Old Faithful. An average eruption lasts 9 - 12 minutes and consists of 1 - 4 bursts, sometimes reaching 200 feet (60m).

*Adapted from the NPS Old Faithful Area Trail Guide and the Old Faithful Area Interactive Map

Data Available:

YNP Thermal Inventory Data

Date	Description	pH	Temp (°C)	Vent Temp (°C)	Conductance (µmhos/cm)
03/08/1999	vent T 83, well established sinter, 10 x 10m, Turban Geyser on north side, shallow pool, deep vent, rhyolite flow NW, runoff channel 6m wide, orange growth	8.82	62.5	83	2200

*Indicates an unofficial name

Note: The YNP RCN is working closely with the YNP Spatial Analysis Center to provide the most accurate and up-to-date information on geothermal features, however, errors do exist. Any questions or concerns regarding features found on this site should be directed to the YNP RCN before contacting the Spatial Analysis Center.