Zep, I would call all the structures in your pictures "docks."
Bill do you call it a Cree-eeek or a "crick"?
Zep, We call it a stream.

I remember going to visit my brother-in-law's parents farm on the Florida panhandle back in the late 60's. I was there maybe three days. It took me a couple of months to stop saying "ya'll" once I got back to Indiana!