I've fished there a few times over the years, stoker has pretty much summed it up really.
Its actually not that deep either, a mate of mine swims there occasionally and he can stand up 50 yds out on low water.
the river water can carry some force with it too so you can't usually fish within 100-200 yds of the river on an ebbing tide, though that also depends on where the shingle banks are as that directs slot of the water flow.
I have seen it at times where there's a shingle spit that goes out 200-300 yds from the beach on the phone she of the river mouth, you could walk out easily but would only be able to fish it for about an hour or two maximum around low water.
I've had a good selection of fish over the years there, whiting, dabs, smooth hounds, thornbacks, flounder and dogfish. I've not had bass myself but a mate has had plenty on lures around the area over the last few years.
Good luck if/when you have a go there, would be great to see a report from the area.