The most distinctive feature of Grotto Geyser
is its cone, which is over six feet high , has one section missing and includes several calcified trees, giving the appearance of a ring of pinnacles surrounding the vent, all usually partly obscured by steam. The geyser was one of the first seven in the basin to be given an official name, in 1870. Eruptions of Grotto Geyser last between one hour and one day, separated by around eight hours. The height is usually not great, around ten feet, but the spectacle is made more impressive by the elegant cone. The vent is surrounded by shallow pools and intricate sinter formations.
Back to map of the Upper Geyser Basin