Mammoth exaggerates? Oh, my!! I'm shocked and appalled!!!
Ok, not really but...they do report snowfall, not water content like the CA water sites. They also report their "base" which is compacted, not fluff.
Like most things, their reports are most useful for season-to-season comparisons. During my extended series of attempts on
Mt. Ritter, I regularly used the
Mammoth Mountain ski site to keep track of snowfall in that part of the Sierra. My journal of that was quite helpful when planning the annual assault on "my" mountain. I still track it to be able to answer questions about the Ritter/Banner area and have found that the year-on-year information is consistent at least in a relative sense.