These lakes are in the Williamson Bowl, below the west face of Mt Williamson. They feed Williamson Creek. The top two are frozen, while the tarn on the bottom has recently thawed. The shallow tarns thaw first because the surface of the lake is closer to the earth's warmth. The big one is at 11,801', and the one above it is about 12,130' (note the cliff). From this perspective, we are looking almost straight down on the bottom lake (the tarn), yet the top lake we only see obliquely.