That was a very as s h ole respone to the OP. He is asking a legit question, if you dont have something useful to say, just let him be. People on online forums so often act in a rude way when someone asks something that has been asked before.
In hindsight, I guess I should have just done a search for "Riff Raft, hole, ass, search function, smart, ass, response"
To the OP, We ran it in early Oct last year at around 800 I think. It was low but totally do-able. I think I would not take a 16 foot boat below around 600 or so, just my uneducated opinion though....
I will be trying to launch about the same time you are, lets hope for water!!!