GOSA (The Geyser Observation and Study Association)


Geysers and Pools

in the

Lower Geyser Basin


[ Predicted Geyser ]

[ Fountain Group - Map ] [ Firehole Lake Drive - Map ]

Fountain Group: - Map

The Fountain Group is a fascinating area. In this small area you can easily see good examples of most of the types of thermal features found in Yellowstone. The group contains fine examples of mud pots, The Fountain Paint Pots, some pretty hot springs, fumaroles and some very active geysers. There is usually at least one geyser erupting in the Fountain Group at all times.

"Bearclaw" Geyser: [Map]

Bearclaw is a small geyser located directly between the boardwalk and Twig Geyser.

Celestine Pool: [Map]

Tragically, Celestine Pool is one of the thermal features in Yellowstone that has taken a human life. A misguided visitor dove into the near boiling water of Celestine Pool in a vain attempt to save a friends dog. Horrifically, the man was still conscious when he was puled from the pool. He died a few hours later.

This story is a good lesson for those visiting the thermal areas. Yellowstone is dangerous and the thermal features can kill you. Always be cautious in the thermal areas and don't take risks. Lee Whittlesey, in the first chapter of his book, Death in Yellowstone, details the thermal deaths in Yellowstone. The stories are heart wrenching and graphic but should be read by anyone planning to explore the thermal areas. The pictures that Whittlesey conjures up, will keep you cautious.

Celestine Pool periodically acts as a geyser. These periods of activity are few and far between with years often passing between periods of activity. When active, Celestine has small widely spaced eruptions to about four feet.

Clepsydra Geyser: [Picture] [Map]

[Clepsydra Geyser Description provided by Graham Meech.]

If you arrive at the Fountain group and there is no geyser erupting, you are seeing an unusual sight. Clepsydra has been erupting almost continuously since the 1959 earthquake so you should not have to rush to get a picture before it stops. Prior to the earthquake Clepsydra erupted with great regularity every 3 minutes. Since the earthquake the only thing that can cause it to stop sometimes is an eruption of Fountain geyser. During a pause in its activity you can see the beautiful yellow, orange and pink colors around Clepsydra's vents. The absence of any geyser activity and the associated quiet does not last long before Clepsydra resumes its activity having been quiet for only a few minutes.

What to look for:

With Clepsydra the unusual thing to see is when it has a pause in its eruption. If you are present during an eruption of Fountain you should listen to see if the sound from Clepsydra changes. One of its vents can enter a steam phase and it starts to roar loudly. This is usually required for Clepsydra to have a chance of pausing although it will not pause every time it roars. If it is going to pause, it will usually pause within 20 minutes of the end of a Fountain eruption.

Fountain Geyser by Haynes

Fountain Geyser: [Picture] [Map]

[Fountain Geyser Description provided by Graham Meech.]

Fountain is a spectacular geyser that, most of the time, dominates the activity of the group. Only when Morning is active does Fountain get overshadowed.

Close to the boardwalk is a large steep sided crater surrounded by a large sinter terrace. Most of the time the crater is partially filled with water which is very calm, slowly rising and falling. As its name implies, Fountain is a classic fountain-type geyser with bursts of water erupting through its large pool. The boardwalk is close enough to the geyser for