Joshua Tree
Seen swimming in the water - wish I could say I spotted this, but my fellow camper pointed it out to me (and I'm so happy about it)!
I was able to find the same individual (documented here https://www.inaturalist.org/observations/171887832) again and can confirm it is a snapping turtle. It was part of a congregation of red-eared sliders. This time, I was able to see its full body underwater including its legs, its full shell, and its tail. It swam around slowly as if waiting to be fed. I also have videos of this individual.