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Ruby Lake

5.0 (4 reviews)

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Earthquake Fault

Earthquake Fault

(30 reviews)

Really easy to get to, no mosquitos, and not crowded at all. An older gentleman there who I think…read morewas an off duty park Ranger or something told us all about the fault, cases of people falling in, and what to look out for, etc. He said it's more impressive looking from the other side of the main road (going from Mammoth Lakes to Mammoth Mountain), though we couldn't find any signs or trailheads for this part afterwards. Nonetheless this is a pretty neat, quick stop with no hike required to get to it.

I recently stopped by this earthquake fault to check it out while in the Mammoth area. It was easy…read moreto find, and parking was easy. Based on the photos, I was expecting this to be more like a cliff with a tall crack in it. In reality, it's more like a very long ditch. If you're into geology, or if you're super impressed by thinking about the earth splitting open, then maybe you should check this out. Personally, I wasn't very moved by this experience. If you didn't know that this was an earthquake fault, then there would be nothing impressive about it. It's just a very long gorge that is kind of deep in some places. I'm not sure if rappelling into the fault is allowed, but I thought it would be interesting to get a closer up view of some of the rocks and pools on the bottom. Honestly not really worth driving out of your way to see this unless you happen to be a geology fanatic, or are just dead set on seeing every possible sight near Mammoth.

Ruby Lake - hiking - Updated May 2026

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