I started at about 4" of snow and at least two blocks visibility. When it got to about 6" deep (the pedals hit the snow at about 5.5"), almost a complete white out, and a 50 mph headwind to return, it was time for plan "B'.
That was to leave the bike path and take the road back, it was somewhat plowed or at least there were ruts to ride in.

Always have a plan "B".

I did make first tracks in fresh powder, that's always nice.