I can't believe that in all the time I've spent in various JMT news groups and forums, I've never heard of the Soda Springs Cabin in Toulumne.

For those who hike the JMT thru Toulumne (rather than staying on the other trail that does NOT cross 120), the trail passes within 100 yards of this cabin.
For those that don't know about Soda Springs, it's a natural spring that bubbles up carbonated water.

At least on my JMT thru, I recall walking right by a similar spring right by the trail between Cathedral Lakes and Toulumne, even took a short video of it because it looked so odd with the bubbles. But I didn't know at the time the water was basically carbonated water (the source of the bubbles).

I only recently learned about it from watching a PCT Thru hikers vlog.