Volcanic Springs

Geysers, Hot Springs,
Mud Pots, and Fumaroles

Upper Geyser Basin, Old Faithful Group

Old Faithful Geyser is the main tourist magnet of the Upper Geyser Basin. Large parking lots lie nearby, and the geyserite mound of Old Faithful is semi-encircled by a boardwalk with several rows of benches on it to ensure comfort while waiting for the next eruption. However, almost every rebuild of the boardwalk in the past, for example in 1996, when the wooden construction was replaced by one made of plastic lumber, enlarged the distance between visitors and the geyser, and so far it is around 90 m (300 feet).
Old Faithful is indeed remarkably faithful in its intervals (the time span between the starts of two subsequent eruptions) and also in its eruption heights. Usually, the interval between eruptions of less than 2.5 minutes duration is around 1 hour, whereas the interval between eruptions lasting more than 2.5 minutes is around and 1 hour and a half. The latter case is the far more common one. It has to be noted that since the time of the geyser's first discovery in 1870 the average over both short and long interval types has increased under the impact of several earthquakes by more than 25 minutes. The height of the water column lies between 32 m and 56 m (106 feet - 185 feet), and during one eruption up to 31,000 liters (8,400 gallons) of water are released. Old Faithful is one of a few geysers with no historical reports of any dormancy. But that wasn't always the case. Yellowstone ranger-naturalist George Marler discovered that 730 +/- 200 years ago a hot spring wiped out a forest on the site of Old Faithful's cone after a long time of quietness. However, geyser activity emerged probably not earlier than 300 years ago.

Old Faithful Geyser:

Old Faithful Geyser Yellowstone

Old Faithful Geyser
At a height of 6 m (20 feet) Old Faithful's geyserite mound is taller than it may appear at first glance because it's quite flat-sloped. On a closer look (from the boardwalk, of course) it exhibits a delicate ornamentation, seeming like covered with blond grizzly fur. There are also several small collecting pools around the 90 cm (3 feet) wide orifice, arranged in cascading sequences, but they can't be spotted from the boardwalk. Unfortunately, park vistors in the late 19th and early 20th century removed quite large amounts of geyserite as souvenirs, leading to a noticeable damaging and loss in height of the cone. Even if the geyser has covered much of the damage with new geyserite crust over time, some scars as well as the altered contour line will remain. In June 1966 Old Faithful was hit by a lightning bolt and and some people were injured because the discharging electric current traveled along a cable of a monitoring device and leapt to the wet observation platform.

Old Faithful's geyserite mound and orifice, close-up:

Old Faithful Geyser Yellowstone

Old Faithful Geyser
Adjacent to Old Faithful's geyserite mound are Split Cone Geyser in the southwest and Teapot Geyser in the northwest. Both may show weak splashing. While Split Cone lies not too far away from the boardwalk, Teapot Geyser is located at even larger distance than Old Faithful. On June 27th, 2017 the Old Faithful webcam recorded a spectacular lightning strike into Split Cone, which obviously caused no damage.

Split Cone Geyser, close-up:

Split Cone Geyser Yellowstone

Split Cone Geyser
In the past century eruptions of Split Cone Geyser were a very rare sight, but that has changed. Now the interval lies in the range of some hours, and even if the splashes are only two foot high, they are often a welcome side event during the waiting period for Old Faithful.

Split Cone Geyser erupting on August 10th, 2017:

Split Cone Geyser Yellowstone

Split Cone Geyser
There are not too many true pictures around of Teapot Geyser. On location, the reasons become obvious: The geyser is erupting very rarely, the eruptions are only one or two feet high, and it is located far away from all boardwalks. If you still don't get discouraged looking for it, you see the flat cone only from the side and can't spot the orifice.

Teapot Geyser steaming (the pile of boulders just in front is a protection for a monitoring device):

Teapot Geyser Yellowstone

Teapot Geyser
Further features of the Old Faithful Group are located downslope on the bank of Firehole River. Most eye-catching among them is Blue Star Spring, which is usually quiet, but rarely some splashing has been observed.

Blue Star Spring:

Blue Star Spring Yellowstone

Blue Star Spring
A short distance downstream the boardwalk passes East Chinaman Spring. The runoff of this constantly bioling spring exhibits a lining of pastel green thermophilic bacteria, which is rather unusual.

East Chinaman Spring:

East Chinaman Spring Yellowstone

East Chinaman Spring
Chinese Spring next to East Chinaman Spring is the last member of the Old Faithful Group. It is rumored that in 1889 four Chinese, who had established al laundry tent over the feature, where blown away by an eruption. Reliable historical sources about the accident are missing, and the only true element of the story may be the fact that Chinese Spring is a rarely active geyser, capable of eruptions up to 6 m (20 feet) height. Nevertheless, the rumor was the reason for naming it Chinaman Spring and later Chinese Spring.

Chinese Spring:

Chinese Spring Yellowstone

Chinese Spring Yellowstone

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