Ive been there twice now, the last time I went was on the ANZAC day holiday and there was very little water in the crossings (would be lucky to get halfway up the wheels). It is a great day trip though from Brisbane especially if you include queen Mary falls and Carrs lookout. We had to make a slight detour as the head road was closed due to a major landslip, you would have to investigate to see if this has been fixed up yet, they didn't seem in a hurry to fix it when I was there last.
However the first time i went after quite a bit of rain and it certainty was an exciting 14 crossings. This is a video of the first time I went.
http://www.youtube.com/watch?v=jCTDM...ature=youtu.be