"How much of a distance is McKillop's Bridge away from the Sandy Creek Crossing?"
McKillop's Bridge is 35-40 kilometres south of Sandy Creek Crossing following the Snowy. By road via Wulgulmerang and Little River it is 82 kilometres. In my first post I mentioned the other crossing, which could be worth exploring.
I've been talking to a guy from the Blue Mountains, Warwick, who is doing a similar trip next Easter, he is called Wokka. Wokka is doing several reccys before he does his trip. Are you from Wokka's group? I've seen from your site that your are an experienced walker.
"What time of year would the river be at it's lowest?"
At the worst time of year, during the height of summer when water elsewhere, can be hard to find. During the early thaw or even in late Spring the current can be too fast and now when it shouldn't be up, good rains have kept the Snowy full. I've seen the Snowy in summer when it has been unlinked pools. That is why I gave you Ranger McClelland's number, because he is the Ranger in charge of southern Kosci' NP and he has his finger on the pulse.
Don't be put off with what I've written. What I've written is to help overcome some of the hurdles. A major trek like this through at times very severe country, especially traversing the coastal ranges of the SE on a route that is in and out of national parks, on little travelled paths at times, travelling into the jurisdictions of others at times, contacting people that you have to rely on like the LHPA Rangers, can take as long to organise properly, than it can take to do the actual trek.
I don't know if you get down this way much, but the round hill on the horizon is Tingeringy. I took the shot from half way up Mount Hamilton. The valley immediately in front is Suggan Buggan and the other valley is the Snowy. Tingaringy is about 35 kilometres from the Snowy as the Ravens and Little Ravens fly.
Warren.