[The description of Spindle was provided by Steve Gryc.]
Spindle Geyser occupies a beautiful site on the bank of White Creek about a half mile southeast of the Surprise Pool parking area. It is a very small geyser, but there is usually only a one to three minute interval between eruptions. Before an eruption Spindle's pool rises and begins to overflow, spilling its boiling water into White Creek. The eruption itself lasts for only a few seconds. Sometimes the eruption is no more than lazy boiling, sometimes the boiling is vigorous and the water domes up a bit, and sometimes water is thrown up 1 to 3 feet. Spindle has been known to erupt to a height of 10 feet, but such eruptions have not been seen since 1985. Spindle Geyser is also known for its deep subterranean thumps which can be felt if you are standing in the right place. Since the geyser erupts so frequently, you should stay to view a series of eruptions to sense the rhythm of Spindle's activity and to see eruptions of different magnitudes.