ditto albernifisher re no issues any tide except current. Only thing I've found is that the concrete can be a little broken up at the lowest tide level so if your boat is prone to easy back sliding, you want to be careful that it stays put if you bounce a bit - esp on retrieval. I'm on bunks & have found a few times when I've been a little too deep on retrieval that mine (21') has dropped back a few inches coming up to the flat & I can't winch it home, so I've taken to just pulling ahead enough that I can get the strap on it before pulling up the slope