hey mate just came back from a week up there ran the back creek all week in a 4.3m dominator.A 5.6 bar crusher if you time the tides right wont be a problem but if you dont time the tide right you wont have enough water to get back in.In a 560 bar crusher you should have no problems running the bar,go and have a look first watch for a while,talk to locals but i personaly have had a hard time with the bar if its lumpy dont go its that easy they lost alot of boats up there cheers