Dave decided to cycle the road. The trip took him around 2 hrs to get up there and 1 and a half to come back. The road a muddy in places with water wash-outs and some frozen parts.
There was a strip of skate-able ice behind the dam then open water for 2-3 km. In the distance it looked like the lake was frozen further. Dave did not have time to check that out as it was quite a walk to that part of the lake.
(from Dave via text and mobile - hopefully photos to come)
Awesome stuff Dave!