Rode multiple lines in Mill D N today, all less steep than 30 deg. We got minor sluffing of new snow on several short test slopes steeper than 30 deg. We observed no cracking, collapsing, or natural activity but lots of new snow and wind effect kept us from considering anything steeper or above treeline. Today was a good example of how to have a glorious day of high-quality powder riding without exposing ourselves to avalanche terrain.