Churn Geyser

Churn Geyser is a small fountain-type geyser in the Upper Geyser Basin. It is a part of the Sawmill Complex with Sawmill, Penta, and Spasmodic geysers.

Eruption Pattern
Churn can erupt in a series, with as many as 9 eruptions in a row recorded in recent years. These eruptions occur about 15 minutes apart and each lasts about 90 seconds.

History
In 1884, Churn Geyser was known to have eruptions of approximately 10 ft, though most of its activity was limited to agitation on the surface of the pool (hence its name).

After a large earthquake in 1959, Churn's pool was observed to roil and overflow more, but no modern eruptions were recorded until 1971.

For periods in 1996 and 1997, Churn dominated the Sawmill complex. At these times, Sawmill was seen infrequently and Penta was seen even less.

When Sawmill Geyser became dormant in 2017, Churn Geyser appeared to become more active.

Current Activity
Churn Geyser is active as of August 2019. Eruptions in the summer of 2019 often lasted 1-2 minutes and occurred at intervals ranging from 10 hrs to 10 days.