"[Castle Geyser] plays seventy-five feet high, for a period of thirty minutes once a day. It has no indicator and starts without warning. From the height of its cone, geologists believe that it is the first geyser that ever played in this entire region. After the water is ejected from the tube of this geyser, it has a steam period lasting many minutes, the roar od which can be hard for a mile or more."