So much for finishing the deck today.  Underneath the half step is totally rotted.

I picked up some replacement boards.  

This rotted board has a tree growing out of it.

This wouldn't be so bad if the screws would come up.  Probably only one quarter do without trouble.  Half come out with a grab-bit, but the final quarter just need to have the head drilled off.  Looks kinda cool at least.