Volcanic Springs

Geysers, Hot Springs,
Mud Pots, and Fumaroles

Upper Geyser Basin, Myriad Group

Myriad Group got its name from the vast number of features concentrated on a small thermal field. It comprises also many geysers, but change is frequent, and so only a few are active at the same period of time. Due to the high number of vents the ground within the group is very dangerous. For that reason it is closed to public entry, but it can be observed from the roads and buildings west of Old Faithful Inn.

One of the most active members of Myriad Group is White Geyser, erupting every few minutes. It is located near the south edge of the group, beyond a large blue pool, called Many Spring Pond.

White Geyser:

White Geyser, Myriad Group, Yellowstone

White Geyser Yellowstone
As the name implies, Many Spring Pond is a cluster of merging hot springs. It gives good orientation to find the spot with the largest concentration of geysers, occupying the geyserite mounds beyond (west of) the pool. Besides White Geyser these are for example Spectacle Geyser, Myriad Geyser, and Round Geyser, the largest geyser ever observed in the Myriad Group with an eruption height of 45 m (150 feet).

Many Spring Pond:

Many Spring Pond, Myriad Group, Yellowstone

Many Spring Pond Yellowstone
North of Many Spring Pond, not far away from the road, some mud pots are scattered over the area.

Myriad Group mud pots. The leftmost is called Pink Cistern:

Mud Pots, Myriad Group, Yellowstone

Myriad Group Mud Pots Yellowstone

Mud Pots, Myriad Group, Yellowstone

Myriad Group Mud Pots Yellowstone
Another group of features can be seen from the access road to the Yellowstone Park Service Stations. Three Sisters Springs is the most eye-catching among them, and accordingly the road is named Three Sisters Road. The three connected pools comprise at least four geysers. One of them, Mugwump Geyser, is located close to the north rim of the northernmost pool, so its vent is quite easy to spot. Two further geysers, Three Crater Geyser and UNNG-MYR-1, are also to be found within the northernmost pool. Mugwump Geyser and Three Crater Geyser have been the most active geysers of the cluster, even if that means only a few times per year.

Three Sisters Springs, seen from north. The vent of Mugwump Geyser is on the right side.

Three Sisters Springs, Myriad Group, Yellowstone

Three Sisters Spring, Myriad Group Yellowstone
Little Brother Geyser adjoins Three Sisters Springs to the east. Its activity varies considerably over the years.

Little Brother Geyser, seen from north:

Little Brother Geyser, Myriad Group, Yellowstone

Little Brother Geyser, Myriad Group Yellowstone
Basin Spring, marking the northwestern corner of the group, shows similarily erratic periods of activity than Little Brother Geyser. However, eruptions are only some feet tall and not very noticeable due to the distance to the road.

Basin Spring:

Basin Spring, Myriad Group, Yellowstone

Basin Spring, Myriad Group Yellowstone

 Back to top



Content and photos on this homepage are protected by law. You may save photos on your Computer, but it is not allowed to use them in any other case without permission of the author. If you want to use photos originated by the author, please ask. Please respect licence conditions of photos of third parties on this homepage.