Well John, you just pointed out how dumb I am. WC is water content or the depth of water if you melted the snow. So, I had it wrong, Graveyard shows 9" of snow which is about 3" of water. Chilkoot shows 30" of snow which is 9" of water. The averages don't say whether it is snow or water so right now the average means nothing to me.
However, changing the year in the URL reveals that in 2013 on March 11, Chilkoot showed 19" WC and Graveyard about 11".
For Chilkoot WC on March 11:
2014 - 9"
2013 - 19"
2012 - 10"
2011 - 31"
2010 - 43"
2009 - 31"
2008 - 45"
2007 - 23"