according to http://www.tirerack.com/tires/tiretech/techpage.jsp?techid=51 if the top of Washington's head is covered it's more than 4/32"
Here are photos of a penny and a quarter in those tires:
https://www.dropbox.com/sc/kp3vlr120nfffmb/AABIVGsTonHPSb9pkksth0lIa