Chances at Reach School?

Not really sure how one classifies a school as a "reach school," but I applied to WashU STL whose median stats on MSAR are 522 and 3.9+. I applied with a 96 percentile MCAT and also 3.9+ but not really sure how I stand. Okay ECs and also IS if that matters. How does one know if a school is a reach or not?
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Tags: Pre-Medical - MD Source Type: forums