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Obsidian Dome

Deadman Summit, June Lake Loop, Mammoth Lakes, CA
Review Highlights
Best if you have a truck!

Obsidian Dome is impressive if you love volcanoes and geology. However, the dirt road was too much... read more

Reviewed 2 days ago
Rich M

Found this place and thrilled my wife who really enjoys geology. Very interesting rock formations... read more

Reviewed 6 days ago
Jim P
Los Altos, California
Read all 81 reviews
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Location is in Mono County near June lakes, this natural dome was created out of lava which solidified to black glass, hence the name, obsidian.
  • Excellent50%
  • Very good37%
  • Average13%
  • Poor0%
  • Terrible0%
Travellers talk about
“black glass” (8 reviews)
“dirt road” (10 reviews)
“wheel drive” (4 reviews)
Deadman Summit, June Lake Loop, Mammoth Lakes, CA
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Reviews (81)
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1 - 10 of 77 reviews

Reviewed 2 days ago

Obsidian Dome is impressive if you love volcanoes and geology. However, the dirt road was too much for our little Jetta and we turned around before we got all the way to the area where you can climb. What we did see was interesting. Bring...More

Thank Rich M
Reviewed 6 days ago

Found this place and thrilled my wife who really enjoys geology. Very interesting rock formations - lots of obsidian and other cool minerals. short hike off the road up to the top of the dome.

Thank Jim P
Reviewed 4 weeks ago

Being a bit of a rock-hound I was keen to see Obsidian Dome as a quick stop on my San Francisco to Phoenix road trip. There are a lot of volcano sites along that road, but I think Obsidian Dome is the best one. Its...More

1  Thank craigallan-za
Reviewed 9 June 2017

Having gone to Mammoth several times this was our first trip to Obsidian Dome and it was amazing! I have two young children 6-9 who were able to do the short hike up the mountain and they loved it.

2  Thank jessicalM3902RR
Reviewed 18 March 2017

Easy dirt road drive into a very beautiful environment. It is breathtaking and amazing to see. The road continues up to some very beautiful streams that were wonderful for picnicking. Great 1/2 day trip.

2  Thank susancC9953VS
Reviewed 28 December 2016 via mobile

The Obsidian dome is rather easy to find. You an drive up the way to it till a gate. Actually there is no sign telling you were it is, of course you see on the leet side of the street many rocks but it never...More

1  Thank Simon B
Reviewed 8 December 2016

The road in is very rough, windy and bumpy. But we did it in a small hatchback car. Rocks are very cool was only a few other people there when we visited.

1  Thank JimmyJackk
Reviewed 10 October 2016 via mobile

This is the most interesting place I have been in a while. My daughter and husband walked to the top and got some great pictures of the dome area and the surrounding peaks. If you look hard enough you can even find the main hole...More

Thank Phyllis V
Reviewed 9 October 2016

If you're interested in rocks or you like to hike, this is a beautiful little side trip. You can either drive on the not-so-great road while admiring the sun dancing on the obsidian cliff face, or you can park and hike to the top to...More

Thank Catherine K
Reviewed 2 October 2016 via mobile

Amazing lava flows from the main volcano vent. Very tall and probably the tallest I've ever seen. Lots of low grade obsidian in huge boulders. Incredible sight to see. I was hoping to find some snow-flake obsidian or pure black onyx dense quality grade billets....More

Thank Eric B
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Questions & Answers
Deborah Nagel D
21 September 2015|
AnswerShow all 4 answers
Response from sd_foodies | Reviewed this property |
Doubtful, it would probably close in November-december