Situated on the bank of the Firehole River, Riverside Geyser is one of the most picturesque and predictable geysers in the park. Because of Riverside's location away from many other geysers, Geologists believe its system is more stable than those geysers that share a water system.

During its 20-minute eruptions, a 75 foot (23m) column of water arches gracefully over the river. Eruptions are about 5.5 to 6.5 hours apart. There is water runoff over the edge of Riverside's cone for an hour or two before each eruption. Many geysers have similar "indicators" that they are about to erupt. Depending on the time of day, you may be lucky enough to see a rainbow over the Firehole River during an eruption.

During the summer, you can find eruption predictions for six major geyers, including Riverside Geyser, in the Old Faithful Visitor Education Center. Remember, the predicted eruption times are the best estimates available. These natural features are not on a schedule.

Information provided by the National Park Service.