Aurum Geyser

Aurum Geyser, on Geyser Hill in Yellowstone National Park’s Upper Geyser Basin, is notable for being only intermittently predictable. Its eruption interval has been connected to moisture in the meadow behind it: when the meadow is wet, eruptions often occur every three to four hours, but when it dries in late summer and early fall, the timing can stretch irregularly to four to seven hours. Aurum also seems to follow the weekly Geyser Hill wave, with its interval changing at regular points in the week. Eruptions are brief, lasting about 90 seconds and usually reaching 15 to 25 feet, often after bubbling in two nearby vents.

Mammoth, Wyoming · United States