Past 5 years Wash U notification dates:
2015: online March 9 at 5 pm EDT (2nd Monday)
2014: online March 10 at 5 pm EDT (2nd Monday)
2013: March 8 (2nd Friday)
2012: March 9 (2nd Friday)
2011: March 11 (2nd Friday)
For the last 5 years, applicants were notified on either the second Monday or the second Friday of March, whichever came first. If that pattern holds true this year, I assume decisions might be available this Friday, March 11th.