Crystal Geyser is located on the east bank of the Green River approximately 4.5 miles (7.25 km) downstream from Green River, Utah. It is a rare example of a cold water carbon dioxide driven geyser; geothermal activity does not play a role in the activity of the geyser. The ground water near the geyser has significant quantities of dissolved carbon dioxide, along with substantial underground gas accumulations in the surrounding area. Saturation of the aquifer with CO2 creates enough pressure to force groundwater through the geyser and out on to the surface. The geyser erupts sometimes to a height of 40 meters or more. During 2005, a study of the timing of the eruptions found them to be bimodal. About 66% of eruptions in the study occurred about 8 hours after the previous eruption, and the rest about 22 hours after. The geyser erupts for an average of one hundred minutes a day, with eruptions either lasting 7/32 minutes, or 98/113 minutes. The bimodal distribution of eruptions is not a well-understood pattern, but is found in other geysers, both cold-water and otherwise.