Open Roadsted anchorage is one that you don't have to cross a bar to enter.
Alan's book on cruising the NSW coast has a thorough discussion of them, and their drawbacks. Three that we have used are Byron Bay, Trial Bay,behind Perpendicular Pt. outside Camden Haven and Sugarloaf Bay, and Broughton Is. as an alternative to going all the way into Port Stephens. Port Stephens, however, is a good place to take on water
and provision, and parts
of it are very nice, indeed. We also sometimes go into the Hunter
R. (Newcastle), but have not used the marina there--we anchor
a little way up the river. It is rarely closed for yacht traffic. We learned to do this from Alan's book. There are other open roadsteads as well, these are only the ones we've used often. Some are reported to be "okay", some more swelly than others, but mostly dependent on how much swell there is when you are in the vicinity. A note about Broughton Is. Anchor
there with very careful attention to the weather, as to when the southerly change will come, you don't want to be caught on the south side by a midnight or 3 a.m. change. If you've any doubt, move on to Pt. Stephens.
The deal with barred entrances is that any big swell can close them; wind
against the tide steepens their waves, hindering progress; and one generally wants to wait for about 3 hrs. of flood before entering, at which time there will still be runout from the impounded waters, but you have a chance of floating off if you accidentally run aground.