Like Grotto Geyser
a little way south, Rocket Geyser
also has a substantial, raised cone around its vent (three feet high, eight feet across), and the two erupt at the same time. Rocket is generally less spectacular, however, its water and steam reaching heights of only ten feet. On very rare occasions the eruption can be much more forceful, when Rocket seems to capture some of the water usually destined for Grotto.
Back to map of the Upper Geyser Basin