Here is a photo taken at 8:19am in the morning. High tide for Townsville was 9:38am that day (2.61m). I had no dramas launching/retrieving my 4.1m tinny but you could see where others had in the past.
When I was last out that way (August I think) there was a bit of building under way using logs at the other lauching area just upstream. I'm unsure what/if anything ever came of it though.
Hope this helps to give you some idea.
Cheers,
Roo.