Paddling the Clutha River?

Hi there.

I have just brought a beautiful Venture hunter Canoe and am trying to find out some information on paddling the Clutha River.

I have spent countless hours looking around the web trying to find information, but haven't had much luck.

Would ideally like to start at Lake Wanaka and paddle through to the outlet at Kaka point, I understand there are the dams that need to be portaged, But just after any information on the grades of the various sections, eg. From Wanaka-Lake cromwell, Clyde Dam- to Alex, and Alex through to Roxburgh etc....

Any help or advice would be much appreciated!

Cheers
Sean