Old Faithful Geyser is a cone geyser located in Wyoming, in Yellowstone National Park in the United States. Video probes were lowered to a maximum depth of 42 feet (13 m) to observe the conduit formation and the processes occurring within the conduit. Eruptions of Old Faithful Geyser can shoot 3,700 to 8,400 U.S. gallons (14–32 kL) of boiling water to a height of 106–185 feet (30–56 m) lasting from 1.5 to 5 minutes. The average height of an eruption is 145 feet (44 m). The highest recorded eruption was 185 feet (56 m) high. Eruptions often occur about 90 minutes apart, but this interval can range from 45 to 125 minutes on occasion. More than 137,000 eruptions have been recorded for Old Faithful Geyser.
