I have made some more enquiries at Snowy Hydro. The visitor centre has a Computer Schematic of the entire Snowy Hydro Scheme showing the Dam levels and what turbines are running in real time. So I would advise anyone wanting to paddle Munyang to Island Bend to ring the visitors centre to find out if 1 or 2 turbines are running before you head up for the drive. They can also tell you what percentge of water is left in the Dam. My guess is that anything above 70% would deliver a good chance of power generation. Ring Visitors Centre Ph 1800 623 776 or 6453 2004. If coming from Canberra it may be a good idea to drop in and see if the turbines are still running before the next leg of your drive.
The only information we can't get are planned releases and for how long the releases may last. But if it is a hot day, its a Friday the Dam is near full there will be a good chance of water being released through peak time electricity which would be into evening hours.
Hope this may help future trips to Munyang
Cheers John