"Castle Geyser has a unique, large, tall geyserite cone structure that may be reminiscent of a castle. This large structure is possibly due to trees growing in the area years prior that became coated in sinter and allowed the height to build up. Layers of geyserite cascade in step-like terraces from the geyser vent and continues to cover the surrounding area. Due to this amount of fragile sinter and the height of the cone, the water is inaccessible for scientific measurements. The western side of Castle Geyser appears smoother than the sinter steps on the east side.