Cannot answer your question right out, what is your defination of "rough" water, first time I went to Table Rock to fish, got there mid morning, boat after boat was loading, I talked to some of the guys, they all said too rough to fish, to us it wsa not, the waves were all of like 1 foot. Here in South Dakota, we are used to the wind on the MO river resevoirs, the four footers fatrap mentioned are more the nrom than not most of the time. I would rather be out in my 911 in them than any tin can, have been in them, they tend to pound pretty good in the rough water. All the free board in the world will not make you comfy in any water if you are not wanting to be in it. I have had my 901 and now my 911 on Erie, Huren, StClair, Michagan, and all the South Dakota river resevoirs, never had an issue at all, i know what my boat can do, and take, i do respect the water, that is the key to me, knowing your equipment and its capabilities on any body of water.