Volcanic Springs

Geysers, Hot Springs,
Mud Pots, and Fumaroles

Sentinel Meadow Group

The Sentinel Meadows are located within the open area west of Fountain Flat Drive, where Sentinel Creek flows through partly marshy grassland towards Firehole River. A loop trail branches off from Fountain Flat Drive just south of the steel bridge near Ojo Caliente and leads back to the road 1.6 km (1 mile) farther south. To reach the thermal area along Sentinel Creek you have to hike 1.5 km (1 mile) in western direction from the steel bridge. However, just as the trail keeps some distance to Sentinel Creek to avoid the wetland, so it passes the thermal features only from far. To take a closer look on them, you have to leave the main trail and to accept wet walking boots sometimes.

Three prominent geyserite cones dominate the Sentinel Meadows. Already in 1872 members of the second Hayden Survey saw them as guards for the upper valley and thus the area and the creek got its names. On top of the easternmost cone Mound Spring shows superheated boiling. Two small geysers lie on the flank of the cone and the adjacent plain, both splashing only up to 60 cm (2 feet) high.

Mound Spring in forground, view towards Steep Cone (right) and Flat Cone (far right):

Mound Spring Yellowstone

Mound Spring Yellowstone
Farther west some trees frame a spot of bare ground, the home of Iron Pot. At an interval of 6 to 9 hours Iron Pot fills with water, erupts up to 2 m (6 feet) height for half an hour and drains thereafter.

Iron Pot at low water level:

Iron Pot Yellowstone

Iron Pot Yellowstone
Leaving Iron Pot to the north in direction of Steep Cone, the tallest of the three geyserite mounds, you come across an area with tightly packed small springs. LSMGNN011 is an example of a weak spouting spring with intermittent activity.

LSMGNN011:

LSMGNN011 Yellowstone

LSMGNN011 Yellowstone
A few feet north of LSMGNN011 The Bulgers are nearly perpetually active. The quiet blue spring in background is LSMGNN024.

The Bulgers:

The Bulgers Yellowstone

The Bulgers Yellowstone
The mound of Steep Cone is occupied on top by Steep Cone Geyser, a superheated boiling pool with less pronounced eruptions.

Steep Cone, also called Sentinel Cone:

Steep Cone Yellowstone

Steep Cone Yellowstone
In the same manner Flat Cone Spring sits atop Flat Cone, the northernmost geyserite mound. You have to cross Sentinel Creek to reach it. This is easily possible, some spots are even suitable for jumping over. Flat Cone Spring is a geyser, capable of spouting up to some meters (more than 10 feet) high. Furthermore, it is the visually most appealing of the three sinter cone springs at Sentinel Meadows. Next to the northern rim of Flat Cone Spring the tiny Small Cone shows up.

Flat Cone Spring and Small Cone (far right):

Flat Cone Spring Yellowstone

Flat Cone Spring Yellowstone
Also north of Sentinel Creek and northwest of Flat Cone, Rosette Geyser is the largest member of a cluster of hot springs. In the 19th century it was known as an active geyser of size, but except a few interruptions in the 1970s it has been dormant for a long time now.

Rosette Geyser:

Rosette Geyser Yellowstone

Rosette Geyser Yellowstone
Other members of the Rosette Geyser Cluster are the unnamed perpetual spouters LSMGNN004 and LSMGNN003 west of Rosette.

LSMGNN004:

LSMGNN004 Yellowstone

LSMGNN003:

LSMGNN003 Yellowstone

Back on the trail it takes approximately 500 m (0.3 miles) to the spot, where a branch off to The Queen's Laundry is said to be. Unfortunately, we could not detect the branch trail, so we decided to go straight through the wetland. We found the meadow to be crowded by small frogs and met also several Wandering Garter Snakes hunting for them. Surprisingly, The Queen's Laundry and the ruins of the old bathhouse are obscured by trees when you approach from the east, but in spite of that there is no risk to miss them. On location the large, constantly boiling pool is an impressive sight, and even more its colorful runoff with the bathhouse in background.

The Queen's Laundry, seen from east:

The Queen's Laundry Yellowstone

The Queen's Laundry Yellowstone

The Queen's Laundry, seen from south:

The Queen's Laundry Yellowstone

The Queen's Laundry Yellowstone
Close to The Queen's Laundry runoff and probably fed by it there once was a pool used for bathing at the end of the 19th century. In fact, the name "Queen's Laundry" refers to the colorful clothes people hung out to dry on nearby trees after they had taken a bath. To enhance comfort former park superintendent P. Norris built a wooden bathhouse in 1881, which was never completed. As the oldest building meant to serve park visitors in the US the ruins are now a National Historic Site.

The Queen's Laundry, runoff and old bathhouse:

The Queen's Laundry Yellowstone

The Queen's Laundry Yellowstone
Dumbbell Spring south of The Queen's Laundry is a comparably cool spring with no visible activity.

Dumbbell Spring:

Dumbbell Spring Yellowstone

Dumbbell Spring Yellowstone

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