I am wondering what that Yellowlegs was eating. It looked like it had legs and a tail, which would make it a newt or salamander; or else just a polyfrog -a bullfrog polywog going through metamorphosis. Are bullfrogs known to be up there? Our newt in Oregon, taricha granulosa granulosa, has a nerve toxin in its skin which paralyzes anything which eats it, so its not likely a newt. Very very few critters would eat one of those. Most salamanders are terrestrial except for the ambystomid family laying eggs in water in late Winter. Those adults leave the water right away and the eggs mature in Summer, at least at lower elevations. Perhaps the larvae mature later up there. Long-Toed Salamanders are our most common ambystomids, so if it wasn't a bullfrog polywog, I suppose it was most likely a larvae of long-toed salamander.

Great photos of the yellowlegs!