Volcanic Springs

Geysers, Hot Springs,
Mud Pots, and Fumaroles

Fountain Flat Drive, Lower River Group - east side of Firehole River

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The River Group is one of the thermal areas you can easily reach from the parking lot at Fountain Flat Drive. Just follow the hiking trail farther south until it crosses Firehole River on a steel bridge. On the right (west) side Ojo Caliente hot spring comes into view, on the left side two small paths branch into the River Group. The one in front of the steel bridge follows the east bank of the river, the one after the bridge the west bank. Both give access to different features of the group, since there is no further bridge a long way upstream until Fairy Falls Trailhead at Rabbit Creek. Please note, the River Group is a backcountry setting, lacking safeguarding equipment such as designated trails or warning signs. Given the low number of visitors, the group features comparatively many hot spring accidents and fatalities. So you should only enter the area if you are experienced with safety rules and regulations for backcountry thermal areas. This is also seasonally closed bear management area.

(Edit: Since end of June 2017 the entire River Group is closed to public access because of yet another hot spring accident. In the falling night of June 13th, 2017 a 21-year-old Xanterra Parks and Resorts employee from North Carolina strolled around the River Group with seven other people when he fell waist-deep into a by now unidentified hot spring. He suffered 3rd degree burns on the lower 40 % of his body.)

Although Ojo Caliente is located across Fountain Flat Drive at some distance to the other members, it is regarded as part of River Group. This spring shows superheated boiling, but otherwise no geyser activity. Featuring temperatures around 93 °C (200 °F), Ojo Caliente is one of the hottest springs in the park. In June 1958 the spring was the scene of a tragic accident, when a 6-year-old boy from Minnesota slipped into the boiling water. For a short moment he was submerged up to his head, what sentenced him to death. Two days later the doctors lost the fight for his life.

Ojo Caliente:

Ojo Caliente Yellowstone

Ojo Caliente, Danny Lewis, Yellowstone
From Ojo Caliente firstly we follow the east bank of Firehole River. On the left side, embedded in the slope of a hill, a mud pot called Grotto Spring attracts attention with widely audible gurgling and splashing.

Grotto Spring:

Grotto Spring Yellowstone

Grotto Spring Yellowstone
In close distance to Grotto Spring, directly on the bank of Firehole River, Baby Bathtub Spring lives up to its name (only by appearance, not in terms of functionality, of course!).

Baby Bathtub Spring:

Baby Bathtub Spring Yellowstone

Baby Bathtub Spring Yellowstone
At Baby Bathtub Spring the river curves to the west. Northeast of the river bend a huge number of unnamed hot pools is scattered over the area, which merges into Pocket Basin. The next photos show the three pools closest to the river, identified by their designations from the RCN database.

Hot Pool LRNN067, close to Baby Bathtub Spring (Mound Geyser is erupting in background):

Hot Pool Spring LRNN067 Yellowstone

Hot Pool LRNN128:

Hot Pool Spring LRNN128 Yellowstone

Hot Pool LRNN127, LRNN128 in background:

Hot Pool Spring LRNN127 Yellowstone

Proceeding south at some distance to the river, you come across numerous hot springs until you reach Azure Spring. LRNN109, LRNN110, and LRNN113 belong to the more striking ones.

Hot Spring LRNN109:

Hot Pool Spring LRNN109 Yellowstone

Hot Spring LRNN110, showing a distinct internal current of hot water:

Hot Pool Spring LRNN110 Yellowstone

Hot Spring LRNN113. Its jagged edges suggest an explosive origin:

Hot Pool Spring LRNN113 Yellowstone

Azure Spring, not far away to the southeast, is usually an intermittent spring, but weak spouting activity has also been observed on rare occasions. Farther to the east the Pocket Basin Mud Pots adjoin, Yellowstones largest collection of mud pots.

Azure Spring:

Azure Spring Yellowstone

Azure Spring Yellowstone


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