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Review Highlights
Close to Mud Volcano

This area is a short stop. You see how fragile and changeable this entire area is. It will only... read more

Reviewed 30 September 2018
Lansing, Michigan
via mobile
Not bad

We just pulled in to take a peak - that's all it really takes. What makes it interesting (and... read more

Reviewed 29 September 2018
Karen C
Palm Bay, United States
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  • Excellent16%
  • Very good24%
  • Average56%
  • Poor0%
  • Terrible4%
Travelers talk about
“battery acid”(3 reviews)
“short stop”(3 reviews)
“mud volcano”(10 reviews)
Suggested duration: < 1 hour
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Grand Loop Road between Canyon and Fishing Bridge Jct., Yellowstone National Park, WY
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All reviews battery acid short stop mud volcano acidic vents stinky earth pools road yellowstone
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1 - 10 of 22 reviews
Reviewed 30 September 2018 via mobile

This area is a short stop. You see how fragile and changeable this entire area is. It will only take about 15 minutes, but you see the river vents as well from the overlook.

Thank MSUmindy
Reviewed 29 September 2018

We just pulled in to take a peak - that's all it really takes. What makes it interesting (and Yellowstone a little unnerving) is the fact that it formed in the parking lot After it was a parking lot. Watch where you walk I guess!

Thank Karen C
Reviewed 20 September 2018 via mobile

Located just off the road at the SE corner of the Hayden Valley this is well worth a look. Two sulphur pools, one bubbling very vigorously and filling the air with a sulphur stench. Essentially pools of sulphuric acid. There is also a bubbling mud...More

Thank RoverP
Reviewed 14 September 2018

Getting to this site is easy as it is by the roadside. Parking is not a problem as there are not many tourists making the stop probably because it is not particularly scenic and is only mildly interesting. The pools with light brown water reminds...More

Thank Michael K
Reviewed 28 August 2018

We stopped as parking along the road was super easy to view the Sulphur Caldron. It was a bit stinky, but the wonders that the earth presents us and what's going on below our feet were magnificent! It's just amazing what this grand park has...More

Thank SDPeterson
Reviewed 13 August 2018

This is a must see, and must smell. There is a mud volcano close by that was very interesting. Has a very strong sulphur smell, like rotten eggs. According to the sign, it is like battery acid. You must stay on all walkways as many...More

Thank Becky H
Reviewed 31 May 2018 via mobile

This area and the mud volcano nearby are so amazing. The earth belches up it's acidic hot waters and rotten egg fumes. Be aware of the buffalo in the area and keep a safe distance. They were so close to the boardwalk when we were...More

Thank Susan T
Reviewed 25 May 2018

For us, the distinguishing characteristic of this stop was the very strong sulphur smell; much more so than any other stop we made in the park. Maybe that is why their is an information sign explaining that the sulphur in this particular caldron is almost...More

Thank Mike O
Reviewed 6 November 2017

This is right by the Mud Volcano area - we stopped at the overlook on our way out. We did not get out and hike, though. It's an acidic hot spring and has a very distinctive smell.

Thank Lisamarie1138
Reviewed 24 September 2017

This area is quite interesting with the acidic springs and strong sulfur smell. The stop is located on the Grand Loop road near the Mud Volcano. Take time to stop if you are in the area...it is unique and worth the stop.

1  Thank Cherie P
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